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CN120032814A - Image processing method and image processing device - Google Patents

Image processing method and image processing device
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CN120032814A
CN120032814ACN202510144978.3ACN202510144978ACN120032814ACN 120032814 ACN120032814 ACN 120032814ACN 202510144978 ACN202510144978 ACN 202510144978ACN 120032814 ACN120032814 ACN 120032814A
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CN120032814B (en
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卓芝政
刘亚欧
柴丽
段云云
李玉娜
华田田
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Beijing Tiantan Hospital
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Abstract

The application provides an image processing method and an image processing device, wherein the method comprises the steps of acquiring multi-modal neural image data detected for a to-be-tested object from a brain detection instrument in real time, wherein the multi-modal neural image data comprises a plurality of brain structure indexes and a plurality of brain function indexes used for representing dynamic brain changes of the to-be-tested object, generating a plurality of brain health deviation images according to basic information of the to-be-tested object, equipment model of the brain detection instrument, the plurality of brain function indexes and the plurality of brain structure indexes to represent brain health states of the to-be-tested object, wherein each brain health deviation image comprises a plurality of brain chart curves and individuation data points, the plurality of brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, and the individuation data points are used for representing ordering conditions in the standard brain chart data detected for the to-be-tested object under the corresponding brain indexes. By the method, the accuracy of brain health state assessment is improved.

Description

Image processing method and image processing device
Technical Field
The present application relates to the field of image processing technology, and in particular, to an image processing method and an image processing apparatus.
Background
Currently, with the continuous accumulation of neuroimage data and the continuous progress of the normalized modeling method, the judgment requirement on brain dynamic change is increasing, and the commonly used normalized modeling method mainly comprises a parameter method, a non-parameter method, a semi-parameter method and a Bayesian statistical method, however, some challenges and disadvantages still exist in the aspect of constructing an individualized brain chart at present.
Firstly, the existing brain chart is mostly built based on data of European and American national population, and the sample size of the existing brain chart is relatively small and the existing brain chart is insufficient, so that the existing brain chart cannot fully reflect the uniqueness of the Chinese population in the process of brain development and aging, and the existing brain chart is lack of the representative brain chart specially aiming at the Chinese population.
In addition, the existing brain charts have some limitations in modeling, most of the brain charts are mainly focused on modeling of brain structures, but modeling is not perfect for important functional indexes of the brain, such as dynamic changes of blood flow perfusion, blood brain barrier permeability, neural activity patterns and the like of brain areas.
Disclosure of Invention
Accordingly, an object of the present application is to provide an image processing method and an image processing apparatus, which overcome at least one of the above-mentioned drawbacks.
According to the basic information of the object to be tested, the equipment model of the brain detection instrument, the brain function indexes and the brain structure indexes, a plurality of brain health deviation reports are generated for representing the brain health state of the object to be tested, wherein the brain health deviation reports comprise a plurality of first brain health deviation images and a plurality of second brain health deviation images, each first brain health deviation image corresponds to one brain function index, each second brain health deviation image corresponds to one brain structure index, each brain health deviation image comprises a plurality of brain chart curves and individualized data points, the brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, and the individualized data points are used for representing standard brain chart data under the corresponding object to be tested.
In an alternative embodiment of the present application, the basic information of the subject to be tested includes an age and a sex, an abscissa of each brain health deviation image is the age, an ordinate of each brain health deviation image is a unit of a corresponding brain index, and the plurality of brain chart curves of each brain health deviation image include a first brain index development curve and at least one second brain index development curve, where the first brain index development curve is used for characterizing a sex of the subject to be tested and a variation curve of an average value of all detection values of a corresponding brain index of an entire age range of a device model of a brain detection instrument of the subject to be tested for brain detection, and a preset gap exists between each data point of the second brain index development curve and each data point of the first brain index development curve.
In an alternative embodiment of the application, a plurality of brain health deviation images of the object to be tested are determined by inputting the age, the sex, the equipment model of the brain detection instrument, the plurality of brain function indexes and the plurality of brain structure indexes of the object to be tested into a brain health assessment model to obtain a plurality of brain health deviation images, wherein the brain health assessment model is used for representing the relation between target parameters and brain health states, and the target parameters are the age, the sex, the plurality of brain indexes obtained by brain detection of the object to be tested and the equipment model of the brain detection instrument.
In an alternative embodiment of the application, the brain health deviation images further comprise a percentile, wherein for each brain health deviation image, a corresponding percentile is displayed in an associated region of the individualized data points in the brain health deviation image, said percentile being used for characterizing the occupancy of the individualized data points associated with the percentile with the standard brain chart data at the corresponding age, the corresponding brain index.
In an alternative embodiment of the application, the brain health assessment model is determined by determining a response variable comprising a brain health deviation image representing the brain health status of the subject to be tested and a covariate comprising an age, a gender, a plurality of brain function indicators and a plurality of brain structure indicators, fitting the response variable and the covariate according to a generalized additive model, resulting in the brain health assessment model.
In an alternative embodiment of the application, a brain health assessment model is trained by obtaining a training sample set comprising a plurality of training samples, each training sample comprising a sample age, a sample gender, a device model of a sample brain detection instrument, a plurality of sample brain function indicators, a plurality of sample brain structure indicators and a plurality of sample brain health deviation images, taking the sample age, the sample gender, the device model of the sample brain detection instrument, the plurality of sample brain function indicators and the plurality of sample brain structure indicators as inputs of an initial brain health assessment model, and taking the plurality of sample brain health deviation images as outputs of the initial brain health assessment model to train the initial brain health assessment model.
In an alternative embodiment of the application, the plurality of brain structure indices comprise structural magnetic resonance imaging data and diffusion tensor weighted imaging data, and the plurality of brain function indices comprise functional magnetic resonance imaging data, arterial spin labeling data, and vessel-water exchange imaging data.
In a second aspect, an embodiment of the present application further provides an image processing apparatus, where the apparatus includes an acquisition module configured to acquire, in real time, multimodal neural image data detected for a subject to be tested from a brain detection instrument, where the multimodal neural image data includes a plurality of brain structural indicators and a plurality of brain function indicators for characterizing brain dynamic changes of the subject to be tested, and a generation module configured to generate, according to basic information of the subject to be tested, a device model of the brain detection instrument, the plurality of brain function indicators, and the plurality of brain structural indicators, a plurality of brain health deviation reports for characterizing brain health states of the subject to be tested, where the plurality of brain health deviation reports include a plurality of first brain health deviation images and a plurality of second brain health deviation images, each of the first brain health deviation images corresponds to one brain function indicator, each of the second brain health deviation images corresponds to one brain structural indicator, each of the brain health deviation images includes a plurality of brain graphs and individual data points, and the plurality of brain graphs are based on a standard graph that is used for characterizing the standard data of the subject to be tested in a standard graph for the data ordering condition of the standard data for the subject to be tested under the corresponding brain indicators.
In a third aspect, embodiments of the present application also provide an electronic device comprising a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory communicating over the bus when the electronic device is in operation, the machine-readable instructions when executed by the processor performing the steps of the method as described above.
In a fourth aspect, embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method as described above.
The image processing method and the image processing device provided by the embodiment of the application are used for acquiring the multi-modal neural image data detected for the object to be tested from the brain detection instrument in real time, wherein the multi-modal neural image data comprises a plurality of brain structure indexes and a plurality of brain function indexes used for representing the dynamic change of the brain of the object to be tested, and generating a plurality of brain health deviation images used for representing the brain health state of the object to be tested according to the basic information of the object to be tested, the equipment model of the brain detection instrument, the plurality of brain function indexes and the plurality of brain structure indexes, wherein each brain health deviation image comprises a plurality of brain chart curves and individuation data points, the plurality of brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, and the individuation data points are used for representing the ordering condition in the standard brain chart data under the corresponding brain indexes detected for the object to be tested. The application improves the accuracy, efficiency and individuation degree of brain health assessment and provides powerful support for clinical diagnosis and treatment.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of an image processing method according to an embodiment of the present application;
FIG. 2 is a flow chart of determining a brain health assessment model according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an image processing apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, every other embodiment obtained by a person skilled in the art without making any inventive effort falls within the scope of protection of the present application.
First, an application scenario to which the present application is applicable will be described. The application can be applied to the technical field of image processing.
It has been found that with the accumulation of neuroimage data and the advancement of technology of normalized modeling methods, there is an increasing demand for fitting dynamic changes of the brain.
Currently, common normalized modeling methods mainly include a parametric method, a non-parametric method, a semi-parametric method, and a bayesian statistical method. However, the existing brain charts still have some defects, most of the brain charts are built based on European and American population, and the sample size of the brain charts is small and the representativeness of the brain charts is insufficient (the sample size is less than 3%), so that the existing brain charts cannot fully reflect the uniqueness of the Chinese population and lack the representativeness of the brain charts aiming at the Chinese population, in addition, the existing brain charts are mostly concentrated in modeling of brain anatomical structures, and the modeling is not perfect for important functional indexes of the brain, such as blood flow perfusion, blood brain barrier permeability, neural activity pattern and the like of the brain region.
Based on the basic information of the object to be tested, the equipment model of the brain detection instrument, the brain function indexes and the brain structure indexes, a plurality of brain health deviation images are generated for representing the brain health state of the object to be tested, wherein each brain health deviation image comprises a plurality of brain chart curves and individuation data points, the plurality of brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, the individuation data points are used for representing the ordering condition in the standard brain chart data under the corresponding brain indexes detected for the object to be tested, and the accuracy of brain health assessment is improved by simultaneously considering the plurality of brain function indexes and the plurality of brain structure indexes.
Referring to fig. 1, fig. 1 is a flowchart of an image processing method according to an embodiment of the application. As shown in fig. 1, the image processing method provided in the embodiment of the present application includes:
s101, acquiring multi-mode nerve image data detected by a to-be-detected object from a brain detection instrument in real time.
Here, all the multi-modal neuroimage data is in digital imaging and communication standard (DIGITAL IMAGING AND Communications IN MEDICINE, DICOM) data format, converted to nifi format using the dcm2niix tool for ease of reading and writing.
The multi-modal neuroimaging data includes a plurality of brain structural indicators and a plurality of brain functional indicators for characterizing brain dynamics of the subject to be tested.
Preferably, the plurality of brain structural indices comprise structural magnetic resonance imaging data and diffusion tensor weighted imaging data, and the plurality of brain functional indices comprise functional magnetic resonance imaging data, arterial spin labeling data, and vessel-water exchange imaging data.
The method comprises the following steps of extracting brain structural indexes aiming at multi-mode nerve image data to obtain the following data:
Structural magnetic resonance imaging data MRI (3D T1 WI) is mainly used for acquiring structural information of the brain, such as brain tissue distribution, brain region division, white matter and gray matter boundaries and the like, and is started from data preprocessing through a segmentation process of a free-form surface (FreeSurfer), wherein the data preprocessing comprises image registration, offset field correction and denoising, brain region separation is performed through brain tissue identification (brain extraction), cortex reconstruction is performed, white matter and gray matter boundaries are identified, and inner and outer cortex surfaces are generated. Thereafter, subcortical structures such as basal ganglia, thalamus, ventricles, etc. are further segmented and normalized brain region segmentation is performed, often using templates such as Deschin-Kiril brain atlas (Desikan-KILLIANY ATLAS). The segmentation process encompasses not only cortical and subcortical structures, but also the scaling of the gyrus and sulcus. Finally, the generated segmentation results include cortical surface, brain region labeling, and anatomical feature data.
Diffusion tensor weighted imaging Data (DKI) provides information about the trend, density, integrity and the like of white matter fiber bundles of the brain, is helpful for understanding the microstructure of the brain, fits the data by using a diffusion kurtosis model through denoising, correction and spatial registration of images, calculates parameters such as diffusion tensor, kurtosis tensor and the like, and obtains diffusion characteristics in different directions. The anisotropy score value (Fractional Anisotropy, FA) reflects the anisotropy of water molecules in a specific direction as an important index. The FA values are then used to analyze the microstructure of the tissue, particularly in areas such as the brain white matter fiber bundles.
Extracting brain function indexes aiming at the multi-mode nerve image data to obtain the following data:
Functional magnetic resonance imaging data (fMRI), reflecting the functional activity of the brain in the execution of specific tasks or resting states, reveal the activation patterns and functional connections of the different brain regions, first, data preprocessing, including artifact and noise removal, and head movement correction, ensuring data alignment at all time points. Each brain image tested was mapped to a standard brain template by spatial normalization to facilitate comparison across individuals. Then, the signal-to-noise ratio is enhanced by smoothing, time series analysis is performed, activation signals of different areas of the brain are extracted, and brain region activities associated with specific tasks or stimuli are identified.
Arterial spin labeling data (ASL) for quantifying cerebral blood perfusion conditions, i.e. Cerebral Blood Flow (CBF), reflecting blood supply changes in different areas of the brain, is first subjected to data preprocessing, including artifact, noise removal, and then image alignment at all time points is ensured by head movement correction. Next, spatial registration is performed, aligning images of different time points or different subjects onto a standard brain template. The baseline signal is then removed and the difference between the arterial spin labeling signal and the control signal is calculated, resulting in a quantitative value for cerebral blood flow (Cerebral Blood Flow, CBF). Through these steps, regional cerebral blood flow information can be extracted from ASL data, revealing blood supply changes in different areas of the brain.
Vessel-water exchange imaging data (VEXI), providing information about blood brain barrier permeability, aid in understanding the mass exchange between cerebral vessels and brain tissue, and linearly register b= s/mm2 diffusion imaging data and bf= s/mm2, bd= s/mm2 VEXI data to T1WI using normalization tools (ANTs). T1WI is then registered from the local space to the study-specific template by a symmetric image normalization algorithm (ANTs (Advanced Normalization Tools) algorithm). The parametric map (e.g., apparent moisture exchange APPARENT WATER exchange across the blood-brain barrier, AXRBBB, etc.) is then iteratively aligned to the template by applying a linear registration transformation matrix and a previously generated deformation field. A gaussian filter with standard deviation of 1.5 voxel size was applied to the pre-processed VEXI data. Finally, MNI152 standard brain T1 weighted images (MNI 152T 1 WI) are non-linearly registered to the corresponding templates to transform some MNI152 template-based atlas into study specific template space to derive water-vessel imaging permeability parameters for specific Areas (AXRBBB).
S102, generating a plurality of brain health deviation reports according to basic information of the to-be-tested object, equipment model of the brain detection instrument, a plurality of brain function indexes and a plurality of brain structure indexes, and representing brain health states of the to-be-tested object.
The brain health deviation reports comprise a plurality of first brain health deviation images and a plurality of second brain health deviation images, each first brain health deviation image corresponds to a brain function index, each second brain health deviation image corresponds to a brain structure index, each brain health deviation image comprises a plurality of brain chart curves and individuation data points, the plurality of brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, and the individuation data points are used for representing ordering conditions in the standard brain chart data under the corresponding brain indexes, which are detected for a to-be-tested object.
The application acquires the multi-mode nerve image data from the brain detection instrument in real time and generates a plurality of brain health deviation images, which can obviously improve the accuracy, efficiency and individuation degree of brain health assessment, provide powerful support for clinical diagnosis and treatment, and simultaneously provide important data resources for brain science research.
Here, the basic information of the subject to be tested includes age and sex, the abscissa of each brain health deviation image is age, the ordinate of each brain health deviation image is a unit of a corresponding brain index, and the plurality of brain graph curves of each brain health deviation image include a first brain index development curve for characterizing the sex of the subject to be tested and a change curve of an average value of all detection values of a corresponding brain index of an entire age range under a device model of a brain detection instrument in which the subject to be tested performs brain detection, and at least one second brain index development curve having a preset gap between each data point of the second brain index development curve and each data point of the first brain index development curve.
In an alternative embodiment, the first brain index development curve (black solid line) is a variation curve representing the average value of all detection values of the brain index corresponding to the whole age segment under the sex and the detection instrument of the subject to be detected, based on standard brain chart data (which may be the average value or range derived from the detection results of a large number of normal persons) corresponding to the brain index. This can be seen as an average human level over the index, a second brain index development curve (black dashed line) is a preset gap from the first brain index development curve, indicating that the threshold level is exceeded or fallen below, a preset interval is present, for example, the lower limit of the preset interval may be 60% of the average human brain health level, the upper limit of the preset interval may be 100% of the average human brain health level, and if a personalized data point is present above the second brain index development curve representing 100% of the average human brain health level, it indicates that the brain health of the subject to be tested exceeds 100% of the average human level, and is in a healthy state, and similarly, if a personalized data point is present below the second brain index development curve representing 60% of the average human brain health level, it indicates that the brain health of the subject to be tested is below 60% of the average human level, and is in a sub-healthy state, requiring further diagnosis. These limits are used to identify whether the brain index of the subject to be tested deviates from the normal range.
Here, a range of reference standards for normal population across life cycles, which varies with age, is created using a plurality of brain structures and brain function indexes of a large number of healthy population, and is referred to as normal population brain chart data (standard brain chart data).
The personalized data points represent the detection results of the object to be tested under the corresponding brain indexes, the ordering condition in the standard brain chart data, the positions of the personalized data points are relative to the positions of the brain chart curves, and whether the brain indexes of the object to be tested are higher or lower than the average level and the deviation degree can be intuitively displayed.
The abscissa of the brain health deviation image is age, the condition of different age groups is represented, the ordinate of the brain health deviation image is a unit corresponding to brain indexes such as fraction, percentage, volume and the like, and the health state of a to-be-tested object on different brain indexes and the change trend with age can be intuitively known by observing the image.
In particular, the brain health deviation images further comprise a percentile, wherein for each brain health deviation image, a corresponding percentile is displayed in the associated region of each data point in the brain health deviation image, the percentile being used to characterize the ratio of the individualized data point associated with the percentile to standard brain chart data at the corresponding age, the corresponding brain index.
Here, a percentile is a statistic that indicates how many proportions of data points are less than or equal to a particular value in a set of data. For example, the 50 th percentile (median) indicates that half of the data points are less than or equal to the value, while the other half are greater than the value.
For each brain health deviation image, a corresponding percentile is calculated and displayed for each personalized data point, reflecting the relative position between the data point of the subject to be tested and standard brain chart data (typically an average or range based on the detection results of a large number of normal people) at the same age and brain index.
In the brain health deviation image, the associated region of each personalized data point (possibly some small region around the data point or the data point itself) will display the corresponding percentile, which region may highlight the percentile information by color coding, numerical labeling, or other visual elements.
If the percentile of a data point is higher (e.g., near 100%), it is indicated that the data point is at a higher level for the same age and brain index than for standard brain chart data, whereas if the percentile is lower (e.g., near 0%), it is indicated that the data point is at a lower level, and by comparing the percentiles of different data points, it is intuitively known whether the health status of the subject under test on different brain indexes deviates from the normal range, and the degree of deviation.
Doctors and researchers can use these percentile-containing brain health deviation images to more accurately assess the brain health status of a subject to be tested, and these images can serve as important basis for developing personalized treatment plans, monitoring disease progression, and assessing treatment efficacy.
A plurality of brain health deviation images of a subject to be tested is determined by:
Inputting the age, the sex, the equipment model of the brain detection instrument, the brain function indexes and the brain structure indexes of the object to be tested into a brain health evaluation model to obtain a plurality of brain health deviation images, wherein the brain health evaluation model is used for representing the relation between target parameters and brain health states, and the target parameters are the age, the sex, the brain indexes obtained by the brain detection of the object to be tested and the equipment model of the brain detection instrument.
Firstly, collecting basic information and brain index data of a to-be-tested object, wherein the age is recorded; sex recording sex (male/female) of the subject to be tested; the brain detection instrument comprises a brain detection instrument, a plurality of brain function indexes, a plurality of brain structure indexes, a brain detection instrument and a brain detection instrument, wherein the brain detection instrument is used for recording the equipment number of a specific instrument for performing brain detection so as to ensure the traceability and accuracy of data;
Then, applied to a brain health assessment model that is capable of characterizing the relationship between target parameters (age, gender, brain index, device model) and brain health status, a plurality of brain health deviation images are obtained from the model, the model will generate a series of brain health deviation images based on the input data, which images may be presented in two-dimensional or three-dimensional form, and display the degree of deviation of brain health status, which deviation images are analyzed by visual inspection or automated analysis tools to determine specific deviation areas and degrees of brain health status. This helps identify potential brain functional or structural abnormalities, and finally, the offset images are interpreted by an expert in the field of neuroscience or medical imaging to determine specific brain health problems and possible causes, and a treatment plan is formulated, i.e., a personalized treatment or intervention plan is formulated for the subject to be tested according to the interpretation results to improve brain health, and brain detection is suggested to be performed periodically to track changes in brain health and adjust the treatment plan.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for determining a brain health evaluation model according to an embodiment of the application. As shown in fig. 2, the image processing method provided in the embodiment of the present application includes:
S201, determining response variables and covariates.
Here, the response variable includes a brain health deviation image representing a brain health state of the subject to be tested, and the covariates include an age, a sex, a plurality of brain function indicators, and a plurality of brain structure indicators.
The response variable here is not a single value in the conventional sense, but a series of images, each of which characterizes the degree of deviation of the subject to be tested from a particular brain health indicator. However, in conventional applications of the GAMLSS model, the response variables are typically numerical. To incorporate brain health deviation images into the GAMLSS model, we need to extract numerical features from these images. These features may be average deviation values, maximum deviation values, sums of deviation values for specific areas in the image, or other quantization indices derived by image analysis algorithms.
The covariates herein include the following parameters:
the age is the actual age of the object to be tested and is a numerical variable;
Sex, sex of the subject to be tested, is usually treated as a classification variable, and can be coded into 0 (female) and 1 (male), or other suitable coding modes are adopted;
A plurality of brain function indicators, wherein the indicators may comprise cognitive function scores, memory test scores and the like, which are all numerical variables;
a number of brain structural indices, which may relate to brain volume, grey matter/white matter ratio etc., are also numerical variables.
And S202, fitting the response variable and the covariate according to a generalized additive model to obtain the brain health assessment model.
Firstly, data preprocessing is carried out, numerical type characteristics are extracted from brain health deviation images and used as response variables of GAMLSS models, normalization processing is carried out on the numerical type covariates (such as age, brain function indexes and brain structure indexes) to eliminate the influence of dimension differences on the models, and classification variables such as gender and the like are properly encoded for use in the models.
Then, an appropriate probability distribution type is selected according to the characteristics of the response variables. Since the response variable is a numerical feature extracted from an image, it is possible to conform to a normal distribution, a lognormal distribution, a gamma distribution, or the like, and define a regression function gj (xi) for each parameter (θ1, θ2, θ3, θ4). These functions may be linear functions or more complex nonlinear functions such as smoothing functions in a Generalized Additive Model (GAM), and by way of example, the four parameters (θ1, θ2, θ3, θ4) typically represent a position parameter (e.g., mean or median), a scale parameter (e.g., standard deviation or variance), a shape parameter (e.g., skewness), and a super-shape parameter (e.g., kurtosis), respectively.
The model is fitted using statistical software (e.g., gamlss packages in the R language). In the fitting process, the distribution type of the response variable and the regression function of each parameter are required to be specified, the fitting effect of the model is checked through residual analysis and other means, the reasonability of model assumption is ensured, and the model structure is adjusted according to the diagnosis result, such as changing the distribution type, adjusting the regression function form and the like, so that the prediction performance of the model is improved.
Modeling is carried out according to the brain structure and function indexes and the ages, and corresponding percentiles are obtained. GAMLSS allows modeling of distribution parameters such as position, scale, shape etc. as a function of covariates, so that percentiles of brain volumes in different age periods can be predicted according to the relationship between brain structure and function index and age.
In an alternative embodiment, the GAMLSS model is in the basic form:
Yi ~ f (yi∣θ1(xi), θ2(xi), θ3(xi),θ4(xi))
Where yi is the response variable, and f (yi|θ1 (xi), θ2 (xi), θ3 (xi), θ4 (xi)) is the probability distribution given a set of position, scale, and shape parameters. Specifically, f represents a probability density function (or probability mass function) in which the parameters θ1, θ2, θ3, θ4 are modeled by covariates. These four parameters (θ1, θ2, θ3, θ4) generally represent a position parameter (e.g., mean or median), a scale parameter (e.g., standard deviation or variance), a shape parameter (e.g., skewness), and a super-shape parameter (e.g., kurtosis), respectively.
Each parameter can be represented by a regression model as a function of a covariate:
θj (xi) =gj (xi), where j=1, 2,3,4, gj (xi) is a regression function, typically a linear regression model or a more complex nonlinear function.
Modeling is performed according to brain structure and function indexes (as covariates) and ages (also as covariates), and percentiles of brain volumes under different age periods are obtained, and firstly, a proper probability distribution is needed to describe brain volume data. For example, a normal distribution, a lognormal distribution, a gamma distribution, or the like may be selected, and then a position parameter (mean or median), a scale parameter (standard deviation or variance), a shape parameter (skewness), and a super-shape parameter (kurtosis) are modeled using GAMLSS models. These parameters may be expressed as a function of brain structure and function index and age, and a model GAMLSS may be fitted using statistical software (e.g., gamlss package in R language), and finally, once the model fitting is complete, the model may be used to predict percentiles of brain volumes at different ages. This typically involves calculating a quantile function at a given probability p.
For normal distribution data, the percentile can be calculated by the following formula:
P(p)=μ+σ×Φ−1(p)
Wherein μ is an estimated mean value (position parameter), σ is an estimated standard deviation (scale parameter), and Φ -1 (p) is a quantile function of a standard normal distribution, namely, a Z value corresponding to a given probability p is obtained.
The GAMLSS model provides a flexible method for modeling and predicting distribution parameters of complex data, and can accurately describe and predict the relationship between brain structures and functional indexes and ages by selecting proper distribution and regression functions, and obtain percentiles of brain volumes in different age periods.
Specifically, the brain health assessment model may be trained by:
A training sample set is obtained.
The training sample set comprises a plurality of training samples, wherein each training sample comprises a sample age, a sample sex, a device model of a sample brain detection instrument, a plurality of sample brain function indexes, a plurality of sample brain structure indexes and a plurality of sample brain health deviation images;
first, a large amount of brain health data needs to be obtained from a reliable medical database or research institution. These data should contain individuals of different ages, sexes, brain health conditions, after the data is collected, the data needs to be cleaned to remove incomplete, abnormal or repeated data, ensure the accuracy and consistency of the data, and for each training sample, the brain health state needs to be noted, which is usually based on diagnosis of a doctor or professional brain health assessment results.
Features useful for brain health prediction, including sample age, sample gender, device model of the sample brain test instrument, multiple sample brain function indicators (e.g., memory, attention, etc.), multiple sample brain structure indicators (e.g., brain volume, sulcus depth, etc.), and possibly genetic information, are then extracted from the raw data, and multiple sample brain health deviation images are output as models. The images may be brain scan images such as MRI, CT, etc., and the health-related features extracted by image processing techniques.
The method comprises the steps of taking a sample age, a sample gender, a device model of a sample brain detection instrument, a plurality of sample brain function indexes and a plurality of sample brain structure indexes as inputs of an initial brain health assessment model, and taking a plurality of sample brain health deviation images as outputs of the initial brain health assessment model so as to train the initial brain health assessment model.
Depending on the complexity of the problem and the nature of the data, a suitable machine learning or deep learning model is selected. For example, convolutional Neural Networks (CNNs) perform well in processing image data, while cyclic neural networks (RNNs) are suitable for processing time-series data.
Taking sample age, sample gender, equipment model of a sample brain detection instrument, a plurality of sample brain function indexes and a plurality of sample brain structure indexes as input features of a model, taking a plurality of sample brain health deviation images as output targets of the model, training an initial model by using a training sample set, minimizing prediction errors by adjusting parameters of the model, and in the training process, evaluating the performance of the model by using cross-validation and other technologies, so as to prevent overfitting.
And (3) evaluating the performance of the model by using a test data set, wherein the indexes comprise accuracy, recall rate, F1 score and the like, fine tuning the parameters of the model according to the evaluation result so as to improve the performance of the model, and knowing which features have the greatest influence on the prediction result of the model through feature importance analysis, thereby being beneficial to further optimizing feature selection and model design.
The image processing method and the image processing device provided by the embodiment of the application are used for acquiring the multi-modal neural image data detected for the object to be tested from the brain detection instrument in real time, wherein the multi-modal neural image data comprises a plurality of brain structure indexes and a plurality of brain function indexes used for representing the dynamic change of the brain of the object to be tested, and generating a plurality of brain health deviation images used for representing the brain health state of the object to be tested according to the basic information of the object to be tested, the equipment model of the brain detection instrument, the plurality of brain function indexes and the plurality of brain structure indexes, wherein each brain health deviation image comprises a plurality of brain chart curves and personalized data points, the plurality of brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, and the personalized data points are used for representing the ordering condition in the standard brain chart data under the corresponding brain indexes detected for the object to be tested. The application improves the accuracy of brain health assessment and provides powerful support for clinical diagnosis and treatment.
The application can flexibly cope with challenges of uneven data distribution and multi-mode fitting, and firstly, the application models according to the Chinese crowd god image data of a large sample. Secondly, the normalized modeling method adopted by the application can effectively improve the fitting accuracy when the data distribution is sparse, and can reasonably fuse the data of different modes, thereby overcoming the defect of the traditional method in the multi-mode data fitting. By means of the method, the change track of the brain structure and function can be accurately drawn, the change process of the whole life cycle of an individual is covered, and an accurate brain chart is formed.
Compared with the prior art, the application has remarkable advantages. Firstly, a brain structure and a functional brain chart specific to the normal population in China are established for the first time, and the method has innovation and representativeness. Secondly, through optimization of a standardized modeling method, the problem of data distribution non-uniformity can be well solved, and therefore accuracy and stability of a brain structure and function change model are improved. In addition, aiming at the fusion of multi-mode data, the application can effectively perform unified modeling on different nerve image modes (such as structural magnetic resonance imaging, functional magnetic resonance imaging and the like), and eliminates the difficulty of the traditional method in mode conversion. This allows for a more comprehensive and accurate construction of brain charts. Finally, the application has higher clinical application value and can provide reliable support for diagnosis and treatment of nervous system diseases.
The application establishes the normal reference value (namely brain chart) of the specific multi-mode fitting brain structure and function of Chinese crowd, has good self-adaptive capacity of the brain structure and function chart, has good transfer generalization capacity, and can be applied to new data.
Since the multi-modal neuroimaging data covers a plurality of brain structural indexes and brain functional indexes, the application can provide a more comprehensive and detailed brain health assessment, which is helpful for identifying various potential problems in brain health, including but not limited to structural abnormalities, dysfunctions and the like, and acquiring and processing data in real time means that brain health status feedback of a subject to be tested can be obtained immediately. The method is particularly important for the situation that medical decision needs to be made rapidly, such as emergency treatment when acute brain injury or disease occurs, the generated brain health deviation image can reflect the difference among individuals by combining the basic information of the to-be-tested object and the equipment model of the brain detection instrument, so that more personalized brain health assessment and treatment scheme formulation can be realized, the brain health deviation image intuitively displays the ratio condition of the to-be-tested object in standard brain chart data under different brain indexes through a plurality of brain chart curves and data points, and doctors and other medical professionals can understand and interpret the data more easily in a visual mode, so that more accurate diagnosis can be made.
The brain health deviation image provided by the application can be used as an important reference basis for clinical decision. The doctor can make more accurate and effective treatment scheme according to the information provided by the images and other clinical data, and the method is not only beneficial to clinical practice, but also provides new tools and visual angles for neuroscience research. By further analyzing these multimodal neuroimaging data, researchers can further understand the structure and function of the brain and their relationships with various neurological diseases.
Based on the same inventive concept, the embodiment of the present application further provides an image processing device corresponding to the image processing method, and since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the image processing method in the embodiment of the present application, the implementation of the device may refer to the implementation of the method, and the repetition is omitted.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an image processing apparatus according to an embodiment of the application. As shown in fig. 3, the image processing apparatus 300 includes:
An acquisition module 301, configured to acquire, in real time, multi-modal neuroimaging data detected for a subject to be tested from a brain detection apparatus, where the multi-modal neuroimaging data includes a plurality of brain structural indicators and a plurality of brain function indicators for characterizing brain dynamic changes of the subject to be tested;
The generating module 302 is configured to generate a plurality of brain health deviation reports according to the basic information of the subject to be tested, the equipment model of the brain detection instrument, the plurality of brain function indexes and the plurality of brain structure indexes, where the plurality of brain health deviation reports include a plurality of first brain health deviation images and a plurality of second brain health deviation images, each of the first brain health deviation images corresponds to a brain function index, each of the second brain health deviation images corresponds to a brain structure index, each of the brain health deviation images includes a plurality of brain chart curves and individualized data points, the plurality of brain chart curves are generated based on standard brain chart data under the corresponding brain indexes, and the individualized data points are used for characterizing the ordering condition in the standard brain chart data under the corresponding brain indexes detected for the subject to be tested.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the application. As shown in fig. 4, the electronic device 500 includes a processor 510, a memory 520, and a bus 530.
The memory 520 stores machine-readable instructions executable by the processor 510, and when the electronic device 500 is running, the processor 510 communicates with the memory 520 through the bus 530, and when the machine-readable instructions are executed by the processor 510, the steps of the image processing method in the method embodiment shown in fig. 1 can be executed, and the specific implementation can be referred to the method embodiment and will not be described herein.
The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the image processing method in the embodiment of the method shown in fig. 1 may be executed, and a specific implementation manner may refer to the embodiment of the method and will not be described herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. The storage medium includes a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
It should be noted that the foregoing embodiments are merely illustrative embodiments of the present application, and not restrictive, and the scope of the application is not limited to the embodiments, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any modification, variation or substitution of some of the technical features of the embodiments described in the foregoing embodiments may be easily contemplated within the scope of the present application, and the spirit and scope of the technical solutions of the embodiments do not depart from the spirit and scope of the embodiments of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

Translated fromChinese
1.一种影像处理方法,其特征在于,包括:1. An image processing method, comprising:从脑部检测仪器实时获取针对待测试对象检测的多模态神经影像数据,所述多模态神经影像数据包括多个脑结构指标和用于表征所述待测试对象的脑动态变化的多个脑功能指标;Acquiring multimodal neuroimaging data detected on a subject to be tested from a brain detection instrument in real time, wherein the multimodal neuroimaging data includes a plurality of brain structure indicators and a plurality of brain function indicators for characterizing dynamic changes in the brain of the subject to be tested;根据所述待测试对象的基本信息、所述脑部检测仪器的设备型号、所述多个脑功能指标以及所述多个脑结构指标,生成多个脑健康偏离报告,用以表征所述待测试对象的脑健康状态,其中,所述多个脑健康偏离报告包括多个第一脑健康偏离图像以及多个第二脑健康偏离图像,每个第一脑健康偏离图像分别对应一脑功能指标,每个第二脑健康偏离图像分别对应一脑结构指标,每个脑健康偏离图像包括多个脑图表曲线和个体化数据点,所述多个脑图表曲线基于在对应脑指标下的标准脑图表数据来生成,所述个体化数据点用于表征针对所述待测试对象检测的在对应脑指标下的标准脑图表数据中的排序情况。According to the basic information of the subject to be tested, the equipment model of the brain detection instrument, the multiple brain function indicators and the multiple brain structure indicators, multiple brain health deviation reports are generated to characterize the brain health status of the subject to be tested, wherein the multiple brain health deviation reports include multiple first brain health deviation images and multiple second brain health deviation images, each first brain health deviation image corresponds to a brain function indicator, each second brain health deviation image corresponds to a brain structure indicator, each brain health deviation image includes multiple brain chart curves and individualized data points, the multiple brain chart curves are generated based on standard brain chart data under corresponding brain indicators, and the individualized data points are used to characterize the sorting status in the standard brain chart data under corresponding brain indicators detected for the subject to be tested.2.根据权利要求1所述的方法,其特征在于,所述待测试对象的基本信息包括年龄和性别,每个脑健康偏离图像的横坐标为年龄,每个脑健康偏离图像的纵坐标为对应脑指标的单位,每个脑健康偏离图像的多个脑图表曲线包括第一脑指标发展曲线以及至少一个第二脑指标发展曲线,所述第一脑指标发展曲线用于表征处于所述待测试对象的性别以及所述待测试对象进行脑部检测的脑部检测仪器的设备型号下的全年龄段的对应脑指标的所有检测值的平均值的变化曲线,第二脑指标发展曲线的每个数据点与所述第一脑指标发展曲线中的每个数据点之间存在预设差距。2. The method according to claim 1 is characterized in that the basic information of the subject to be tested includes age and gender, the horizontal coordinate of each brain health deviation image is age, the vertical coordinate of each brain health deviation image is the unit of the corresponding brain index, and the multiple brain chart curves of each brain health deviation image include a first brain index development curve and at least one second brain index development curve, the first brain index development curve is used to characterize the change curve of the average value of all detection values of the corresponding brain index of all age groups under the gender of the subject to be tested and the device model of the brain detection instrument used by the subject to be tested for brain detection, and there is a preset gap between each data point of the second brain index development curve and each data point in the first brain index development curve.3.根据权利要求2所述的方法,其特征在于,通过以下方式确定所述待测试对象的多个脑健康偏离图像:3. The method according to claim 2, characterized in that the multiple brain health deviation images of the subject to be tested are determined by:将所述待测试对象的年龄、性别、所述脑部检测仪器的设备型号、所述多个脑功能指标以及所述多个脑结构指标输入脑健康评估模型,得到多个脑健康偏离图像,其中,所述脑健康评估模型用于表征目标参数与脑健康状态之间的关系,所述目标参数为待测试对象的年龄、性别、待测试对象进行脑部检测得到的多个脑指标以及脑部检测仪器的设备型号。The age, gender, device model of the brain detection instrument, the multiple brain function indicators, and the multiple brain structure indicators of the subject to be tested are input into a brain health assessment model to obtain multiple brain health deviation images, wherein the brain health assessment model is used to characterize the relationship between target parameters and brain health status, and the target parameters are the age, gender, multiple brain indicators obtained by brain detection of the subject to be tested, and the device model of the brain detection instrument.4.根据权利要求3所述的方法,其特征在于,所述脑健康偏离图像还包括百分位数,其中,针对每个脑健康偏离图像,在该脑健康偏离图像中的个体化数据点的关联区域显示对应的百分位数,所述百分位数用于表征与该百分位数关联的个体化数据点在对应年龄、对应脑指标下与标准脑图表数据之间的占比情况。4. The method according to claim 3 is characterized in that the brain health deviation image also includes percentiles, wherein for each brain health deviation image, the corresponding percentile is displayed in the associated area of the individualized data point in the brain health deviation image, and the percentile is used to characterize the proportion of the individualized data point associated with the percentile compared with the standard brain chart data under the corresponding age and corresponding brain index.5.根据权利要求4所述的方法,其特征在于,通过以下方式确定所述脑健康评估模型:5. The method according to claim 4, characterized in that the brain health assessment model is determined by:确定响应变量和协变量,所述响应变量包括表征待测试对象的脑健康状态的脑健康偏离图像,所述协变量包括年龄、性别、多个脑功能指标以及多个脑结构指标;Determining a response variable and a covariate, wherein the response variable includes a brain health deviation image characterizing a brain health state of the subject to be tested, and the covariate includes age, gender, a plurality of brain function indicators, and a plurality of brain structure indicators;根据广义加性模型针对所述响应变量和所述协变量进行拟合,得到所述脑健康评估模型。The response variable and the covariate are fitted according to a generalized additive model to obtain the brain health assessment model.6.根据权利要求3所述的方法,其特征在于,通过以下方式训练脑健康评估模型:6. The method according to claim 3, characterized in that the brain health assessment model is trained by:获取训练样本集合,所述训练样本集合中包括多个训练样本,每个训练样本包括样本年龄、样本性别、样本脑部检测仪器的设备型号、多个样本脑功能指标、多个样本脑结构指标以及多个样本脑健康偏离图像;Acquire a training sample set, wherein the training sample set includes a plurality of training samples, each training sample includes a sample age, a sample gender, a device model of a sample brain detection instrument, a plurality of sample brain function indicators, a plurality of sample brain structure indicators, and a plurality of sample brain health deviation images;将所述样本年龄、所述样本性别、所述样本脑部检测仪器的设备型号、所述多个样本脑功能指标以及所述多个样本脑结构指标作为初始脑健康评估模型的输入,将所述多个样本脑健康偏离图像作为所述初始脑健康评估模型的输出,以对所述初始脑健康评估模型进行训练。The sample age, the sample gender, the equipment model of the sample brain detection instrument, the multiple sample brain function indicators and the multiple sample brain structure indicators are used as inputs of an initial brain health assessment model, and the multiple sample brain health deviation images are used as outputs of the initial brain health assessment model to train the initial brain health assessment model.7.根据权利要求1所述的方法,其特征在于,所述多个脑结构指标包括结构磁共振成像数据和扩散张量加权成像数据,所述多个脑功能指标包括功能磁共振成像数据、动脉自旋标记数据以及血管-水交换成像数据。7. The method according to claim 1 is characterized in that the multiple brain structure indicators include structural magnetic resonance imaging data and diffusion tensor weighted imaging data, and the multiple brain function indicators include functional magnetic resonance imaging data, arterial spin labeling data and vascular-water exchange imaging data.8.一种影像处理装置,其特征在于,包括:8. An image processing device, comprising:获取模块,用于从脑部检测仪器实时获取针对待测试对象检测的多模态神经影像数据,所述多模态神经影像数据包括多个脑结构指标和用于表征所述待测试对象的脑动态变化的多个脑功能指标;An acquisition module, used for acquiring multimodal neuroimaging data detected on a subject to be tested from a brain detection instrument in real time, wherein the multimodal neuroimaging data includes a plurality of brain structure indicators and a plurality of brain function indicators used to characterize dynamic changes in the brain of the subject to be tested;生成模块,用于根据所述待测试对象的基本信息、所述脑部检测仪器的设备型号、所述多个脑功能指标以及所述多个脑结构指标,生成多个脑健康偏离报告,用以表征所述待测试对象的脑健康状态,其中,所述多个脑健康偏离报告包括多个第一脑健康偏离图像以及多个第二脑健康偏离图像,每个第一脑健康偏离图像分别对应一脑功能指标,每个第二脑健康偏离图像分别对应一脑结构指标,每个脑健康偏离图像包括多个脑图表曲线和个体化数据点,所述多个脑图表曲线基于在对应脑指标下的标准脑图表数据来生成,所述个体化数据点用于表征针对所述待测试对象检测的在对应脑指标下的标准脑图表数据中的排序情况。A generating module is used to generate a plurality of brain health deviation reports according to the basic information of the subject to be tested, the equipment model of the brain detection instrument, the plurality of brain function indicators and the plurality of brain structure indicators, so as to characterize the brain health status of the subject to be tested, wherein the plurality of brain health deviation reports include a plurality of first brain health deviation images and a plurality of second brain health deviation images, each first brain health deviation image corresponds to a brain function indicator, each second brain health deviation image corresponds to a brain structure indicator, each brain health deviation image includes a plurality of brain chart curves and individualized data points, the plurality of brain chart curves are generated based on standard brain chart data under corresponding brain indicators, and the individualized data points are used to characterize the sorting status in the standard brain chart data under corresponding brain indicators detected for the subject to be tested.9.一种电子设备,其特征在于,包括:处理器、存储器和总线,所述存储器存储有所述处理器可执行的机器可读指令,当电子设备运行时,所述处理器与所述存储器之间通过总线通信,所述处理器执行所述机器可读指令,以执行如权利要求1至7任一所述方法的步骤。9. An electronic device, characterized in that it comprises: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of any method as claimed in claims 1 to 7.10.一种计算机可读存储介质,其特征在于,所述计算机可读存储介质上存储有计算机程序,所述计算机程序被处理器运行时执行如权利要求1至7任一所述方法的步骤。10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of any one of the methods according to claims 1 to 7 are executed.
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