CN114398803B - Shim-field co-simulation method, device, electronic device and storage medium - Google Patents
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Abstract
Description
Translated fromChinese技术领域technical field
本发明实施例涉及医疗数据处理领域，尤其涉及一种匀场联合仿真方法、装置、电子设备及存储介质。Embodiments of the present invention relate to the field of medical data processing, and in particular, to a shimming co-simulation method, device, electronic device, and storage medium.
背景技术Background technique
现有技术中，由于电磁场数值仿真工具不具备编程后处理能力，因此电磁仿真与匀场分析是两个独立的过程。在电磁仿真过程中，用户需要先通过传统场模型仿真算法或场路一体化仿真方法得到射频发射线圈的电磁仿真结果，然后手动将该电磁仿真结果导出。在匀场分析过程中，用户需要在外部编程环境中读取该导出的电磁仿真结果，并对该电磁仿真结果进行匀场分析，以得到射频匀场分布。In the prior art, since electromagnetic field numerical simulation tools do not have the ability to program post-processing, electromagnetic simulation and shimming analysis are two independent processes. In the electromagnetic simulation process, the user needs to obtain the electromagnetic simulation result of the RF transmitting coil through the traditional field model simulation algorithm or the field-circuit integration simulation method, and then manually export the electromagnetic simulation result. During the shimming analysis process, the user needs to read the derived electromagnetic simulation results in the external programming environment, and perform shimming analysis on the electromagnetic simulation results to obtain the RF shimming distribution.
人体全身成像时，射频发射场不均匀的区域主要是腹部，由于其具有人体最大的横断面积，因此腹部层面的电磁场数据量都很大，数据转移和传输费时费力，给仿真人员带来了巨大的负担。When imaging the human body, the region with uneven RF emission field is mainly the abdomen. Because it has the largest cross-sectional area of the human body, the amount of electromagnetic field data at the abdomen level is very large, and the data transfer and transmission are time-consuming and labor-intensive, which brings huge problems to the simulation personnel. burden.
综上，本申请人在实现本发明实施例的过程中发现，现有电磁仿真与匀场分析方法至少存在无法在保证射频安全的前提下快速实现射频匀场仿真自动化的问题。To sum up, the applicant found in the process of implementing the embodiments of the present invention that the existing electromagnetic simulation and shimming analysis methods at least have the problem that the automation of RF shimming simulation cannot be quickly realized under the premise of ensuring RF safety.
发明内容SUMMARY OF THE INVENTION
本发明实施例提供了一种匀场联合仿真方法、装置、电子设备及存储介质，解决了现有电磁仿真与匀场分析方法存在无法在保证射频安全的前提下快速实现射频匀场仿真自动化的问题。The embodiments of the present invention provide a shimming co-simulation method, device, electronic device and storage medium, which solve the problem that the existing electromagnetic simulation and shimming analysis methods cannot quickly realize the automation of RF shimming simulation under the premise of ensuring RF safety. question.
第一方面，本发明实施例提供了一种匀场联合仿真方法，该方法包括：In a first aspect, an embodiment of the present invention provides a shimming co-simulation method, which includes:
获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据，所述初始配置数据包括射频发射线圈的各个发射通道的初始幅相数据；Obtaining initial simulation data generated by the simulation software by performing an electromagnetic simulation operation based on the initial configuration data, where the initial configuration data includes initial amplitude and phase data of each transmitting channel of the radio frequency transmitting coil;
对所述初始仿真数据进行匀场分析以得到目标幅相数据，并将所述目标幅相数据发送至所述仿真软件；Perform shimming analysis on the initial simulation data to obtain target amplitude and phase data, and send the target amplitude and phase data to the simulation software;
获取所述仿真软件确定的所述目标幅相数据对应的功率损耗密度分布数据，并确定所述功率损耗密度分布数据对应的特定吸收率数据；Acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data;
如果所述特定吸收率数据大于或等于预设阈值，则以所述目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制所述仿真软件基于所述当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对所述初始仿真数据进行匀场分析以得到目标幅相数据的步骤。If the specific absorption rate data is greater than or equal to a preset threshold, taking the target amplitude and phase data as a starting point, generating current amplitude and phase data based on a preset iteration interval, and controlling the simulation software to repeat the current amplitude and phase data based on the current amplitude and phase data Performing an electromagnetic simulation operation to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain target amplitude and phase data.
第二方面，本发明实施例还提供了一种匀场联合仿真装置，该装置包括：In a second aspect, an embodiment of the present invention also provides a shimming co-simulation device, the device comprising:
初始仿真数据获取模块，用于获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据，所述初始配置数据包括射频发射线圈的各个发射通道的初始幅相数据；an initial simulation data acquisition module, configured to acquire initial simulation data generated by the simulation software performing an electromagnetic simulation operation based on the initial configuration data, where the initial configuration data includes initial amplitude and phase data of each transmitting channel of the radio frequency transmitting coil;
匀场分析模块，用于对所述初始仿真数据进行匀场分析以得到目标幅相数据，并将所述目标幅相数据发送至所述仿真软件；a shimming analysis module for performing shimming analysis on the initial simulation data to obtain target amplitude and phase data, and sending the target amplitude and phase data to the simulation software;
功率损耗密度分布数据获取模块，用于获取所述仿真软件确定的所述目标幅相数据对应的功率损耗密度分布数据，并确定所述功率损耗密度分布数据对应的特定吸收率数据；a power loss density distribution data acquisition module, configured to acquire power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determine specific absorption rate data corresponding to the power loss density distribution data;
射频安全验证模块，用于如果所述特定吸收率数据大于或等于预设阈值，则以所述目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制所述仿真软件基于所述当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对所述初始仿真数据进行匀场分析以得到目标幅相数据的步骤。The radio frequency safety verification module is used for, if the specific absorption rate data is greater than or equal to a preset threshold, take the target amplitude and phase data as a starting point, generate current amplitude and phase data based on a preset iteration interval, and control the simulation software based on The electromagnetic simulation operation is performed again on the current amplitude and phase data to obtain current initial simulation data, and the step of performing shimming analysis on the initial simulation data to obtain target amplitude and phase data is returned.
第三方面，本发明实施例还提供了一种电子设备，所述电子设备包括：In a third aspect, an embodiment of the present invention further provides an electronic device, the electronic device comprising:
一个或多个处理器；one or more processors;
存储装置，用于存储一个或多个程序；a storage device for storing one or more programs;
当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现任意实施例所述的匀场联合仿真方法。When the one or more programs are executed by the one or more processors, the one or more processors implement the shim co-simulation method described in any of the embodiments.
第四方面，本发明实施例还提供了一种包含计算机可执行指令的存储介质，所述计算机可执行指令在由计算机处理器执行时用于执行任意所述的匀场联合仿真方法。In a fourth aspect, an embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are used to execute any of the aforementioned shim co-simulation methods when executed by a computer processor.
本发明实施例提供的匀场联合仿真方法的技术方案，获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据；对初始仿真数据进行匀场分析以得到目标幅相数据，并将目标幅相数据发送至仿真软件；获取仿真软件确定的目标幅相数据对应的功率损耗密度分布数据，并确定功率损耗密度分布数据对应的特定吸收率数据；如果特定吸收率数据大于或等于预设阈值，则以目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制仿真软件基于当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对初始仿真数据进行匀场分析以得到目标幅相数据的步骤。在外部编程环境中调用并控制电磁仿真软件，实现仿真结果的直接调用并匀场分析的全套操作流程，减少人为干预，使电磁仿真的后处理自动化，且在仿真匀场后充分验证射频安全性，保证结果符合国际通用安全标准，在保证射频安全可用性的同时显著提高了匀场仿真的自动批量处理效率。The technical solution of the shimming co-simulation method provided by the embodiment of the present invention is to obtain initial simulation data generated by the simulation software performing electromagnetic simulation operations based on the initial configuration data; perform shimming analysis on the initial simulation data to obtain target amplitude and phase data, and use the target The amplitude and phase data are sent to the simulation software; the power loss density distribution data corresponding to the target amplitude and phase data determined by the simulation software is obtained, and the specific absorption rate data corresponding to the power loss density distribution data is determined; if the specific absorption rate data is greater than or equal to the preset threshold , then take the target amplitude and phase data as the starting point, generate the current amplitude and phase data based on the preset iteration interval, and control the simulation software to perform the electromagnetic simulation operation again based on the current amplitude and phase data to obtain the current initial simulation data, and return to the initial simulation data. Steps of shimming analysis to obtain target amplitude and phase data. Call and control the electromagnetic simulation software in the external programming environment, realize the complete operation process of directly calling the simulation results and shimming analysis, reduce human intervention, automate the post-processing of electromagnetic simulation, and fully verify the RF safety after the simulation shimming , to ensure that the results comply with international general safety standards, and to ensure the safety and availability of RF, while significantly improving the efficiency of automatic batch processing of shimming simulation.
附图说明Description of drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图做一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.
图1是本发明实施例一提供的匀场联合仿真的流程图；1 is a flowchart of a shimming co-simulation provided in Embodiment 1 of the present invention;
图2是本发明实施例二提供的匀场联合仿真装置的结构框图；2 is a structural block diagram of a shimming co-simulation device provided in Embodiment 2 of the present invention;
图3是本发明实施例三提供的电子设备的结构框图。FIG. 3 is a structural block diagram of an electronic device according to Embodiment 3 of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，以下将参照本发明实施例中的附图，通过实施方式清楚、完整地描述本发明的技术方案，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the objectives, technical solutions and advantages of the present invention clearer, the following will refer to the accompanying drawings in the embodiments of the present invention, and describe the technical solutions of the present invention clearly and completely through the implementation manner. Obviously, the described embodiments are the present invention. Some examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
实施例一Example 1
图1是本发明实施例一提供的匀场联合仿真方法的流程图。本实施例的技术方案适用于通过调用仿真软件在保证射频安全的前提下实现匀场仿真的自动化的情况。该方法可以由本发明实施例提供的匀场联合仿真装置来执行，该装置设置于外部编程环境中，并可以采用软件和/或硬件的方式实现，并配置在电子设备的处理器中应用。其中，外部编程环境可以是Matlab、python等编程软件。FIG. 1 is a flowchart of a shimming co-simulation method provided in Embodiment 1 of the present invention. The technical solution of this embodiment is applicable to the situation in which the automation of shimming simulation is realized under the premise of ensuring radio frequency safety by invoking simulation software. The method can be executed by the shim co-simulation device provided in the embodiment of the present invention, which is set in an external programming environment, can be implemented in software and/or hardware, and is configured and applied in a processor of an electronic device. The external programming environment may be programming software such as Matlab and python.
该方法具体包括如下步骤：The method specifically includes the following steps:
S101、获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据，其中，初始配置数据包括射频发射线圈的各个发射通道的初始幅相数据。S101. Acquire initial simulation data generated by a simulation software performing an electromagnetic simulation operation based on the initial configuration data, where the initial configuration data includes initial amplitude and phase data of each transmitting channel of a radio frequency transmitting coil.
其中，仿真软件为现有电磁数值仿真软件，比如CST（Computer SimulationTechnology，CST Microwave Studio）、HFSS（High Frequency Structure Simulator，高频结构仿真）等。Among them, the simulation software is the existing electromagnetic numerical simulation software, such as CST (Computer Simulation Technology, CST Microwave Studio), HFSS (High Frequency Structure Simulator, high frequency structure simulation) and the like.
可以理解的是，初始仿真数据是对应于初始配置数据的电磁仿真结果。It can be understood that the initial simulation data is an electromagnetic simulation result corresponding to the initial configuration data.
在一个实施例中，初始仿真数据为圆极化模式下的发射场分布数据。In one embodiment, the initial simulation data is emission field distribution data in a circular polarization mode.
在一个实施例中，建立外部编程环境与仿真软件的通信连接，在外部编程环境中，将初始配置数据赋值给仿真软件中的射频发射线圈的各个发射通道；控制仿真软件基于初始配置数据执行电磁仿真操作以生成初始仿真数据，并将初始仿真数据发送至第一预设存储位置；在检测到仿真软件完成电磁仿真操作时，从第一预设存储位置读取初始仿真数据。该实施例中，在需要进行电磁仿真时，使用仿真软件进行电磁仿真，且仿真软件将仿真结果发送至外部编程环境的第一预设存储位置。In one embodiment, a communication connection between the external programming environment and the simulation software is established, and in the external programming environment, initial configuration data is assigned to each transmission channel of the radio frequency transmitting coil in the simulation software; the simulation software is controlled to execute electromagnetic waves based on the initial configuration data. The simulation operation is performed to generate initial simulation data and send the initial simulation data to the first preset storage location; when it is detected that the simulation software completes the electromagnetic simulation operation, the initial simulation data is read from the first preset storage location. In this embodiment, when electromagnetic simulation needs to be performed, electromagnetic simulation is performed using simulation software, and the simulation software sends the simulation result to the first preset storage location of the external programming environment.
在一个实施例中，通过接口组件建立起仿真软件与外部编程环境之间的桥梁，使电磁仿真软件作为一个函数被外部调用，实现仿真结果的自动化后处理。其中，接口组件为仿真软件已配置的通信接口组件，比如COM（Component Object Model，组件对象模型）组件。实际使用时，通过预先创建的接口指针调用仿真软件中的结果合成器对初始配置数据进行电磁仿真计算，以生成该初始配置数据对应的初始仿真数据。In one embodiment, a bridge between the simulation software and an external programming environment is established through the interface component, so that the electromagnetic simulation software can be called externally as a function to realize automatic post-processing of the simulation results. The interface component is a communication interface component configured by the simulation software, such as a COM (Component Object Model, Component Object Model) component. In actual use, the result synthesizer in the simulation software is called through a pre-created interface pointer to perform electromagnetic simulation calculation on the initial configuration data, so as to generate initial simulation data corresponding to the initial configuration data.
以人体模型为负载的8通道射频线圈仿真为例，在外部编程环境中调用仿真软件的后处理模块下的电磁计算模板中的结果合成器，并设置初始配置数据。示例性的，初始配置数据包括射频发射线圈的各个发射通道的标识、幅值和相位，格式为（N，I和θ），其中，N为发射通道标识，I为幅值，θ为相位。示例性的，圆极化模式下各通道值配置数据分别为(1，1，0)，(2，1，45)，(3，1，90)，(4，1，135)，(5，1，120)，(6，1，225)，(7，1，270)，(8，1，315)。该结果合成器基于电磁数值仿真函数，按照上述圆极化模式对各通道的电磁场进行合成。外部编程环境在检测到电磁场合成时，调用仿真软件中的结果处理器，并设定导出对象、步长、x-y-z方向范围、文件名称等参数以及保存路径，在z=0平面及其他人体腹部横断面处，依次导出8个通道及圆极化模式下的发射场分布，以使导出的数据存在于该保存路径对应的第一预设存储位置。Taking the 8-channel RF coil simulation with the human body model as the load as an example, the result synthesizer in the electromagnetic calculation template under the post-processing module of the simulation software is called in the external programming environment, and the initial configuration data is set. Exemplarily, the initial configuration data includes the identification, amplitude and phase of each transmitting channel of the radio frequency transmitting coil, and the format is (N, I and θ), where N is the identification of the transmitting channel, I is the amplitude, and θ is the phase. Exemplarily, the configuration data of each channel value in the circular polarization mode are (1, 1, 0), (2, 1, 45), (3, 1, 90), (4, 1, 135), (5) , 1, 120), (6, 1, 225), (7, 1, 270), (8, 1, 315). The result synthesizer synthesizes the electromagnetic fields of each channel according to the above circular polarization mode based on the electromagnetic numerical simulation function. When the external programming environment detects the electromagnetic field synthesis, it calls the result processor in the simulation software, and sets parameters such as the export object, step size, x-y-z direction range, file name, and save path, and crosses the abdomen at the z=0 plane and other human bodies. At the surface, 8 channels and the emission field distribution in the circular polarization mode are sequentially derived, so that the derived data exists in the first preset storage location corresponding to the storage path.
S102、对初始仿真数据进行匀场分析以得到目标幅相数据，并将目标幅相数据发送至所述仿真软件。S102. Perform shimming analysis on the initial simulation data to obtain target amplitude and phase data, and send the target amplitude and phase data to the simulation software.
在高场磁共振系统中，射频匀场方法主要是通过采集各通道灵敏度，在不改变原有序列时序的情况下，利用各通道独立可控的特性，通过调节每个通道的幅值和相位，对磁场过强或过弱的区域进行补偿，以得到整个区域更加均匀的激发磁场。In the high-field magnetic resonance system, the RF shimming method mainly collects the sensitivity of each channel, and uses the independently controllable characteristics of each channel to adjust the amplitude and phase of each channel without changing the original sequence sequence. , to compensate the area where the magnetic field is too strong or too weak, so as to obtain a more uniform excitation magnetic field in the whole area.
其中，射频匀场算法包括但不限于内点法迭代、两次匀场等方法。Wherein, the radio frequency shimming algorithm includes but is not limited to methods such as interior point method iteration, double shimming and the like.
可以理解的是，目标幅相数据对应一个射频匀场分布，即基于该目标幅相数据进行电磁仿真得到的发射场分布是均匀的。It can be understood that the target amplitude and phase data corresponds to a radio frequency shimming distribution, that is, the emission field distribution obtained by electromagnetic simulation based on the target amplitude and phase data is uniform.
外部编程环境在第一预设存储位置读取初始仿真数据，显示上述圆极化模式下的发射场分布，将该发射场分布作为参照。手动框选感兴趣区，调用外部编程环境中的优化工具箱中的约束最小化工具，以使约束最小化工具通过幅相数据迭代来寻找各个发射通道的幅相最优解。其中，约束最小化工具的目标函数包括数据拟合部分和正则化部分，以防止过拟合。幅度数据的迭代范围为（1，2），相位数据的迭代范围为（-π，π）。约束最小化工具在目标函数收敛后，控制迭代结束，返回一组最优的幅度数据和相位数据，即目标幅相数据，并显示该目标幅相数据对应的发射场分布。该发射场分布即为射频匀场分布。The external programming environment reads the initial simulation data in the first preset storage location, displays the emission field distribution in the above-mentioned circular polarization mode, and uses the emission field distribution as a reference. Manually select the region of interest, and call the constraint minimization tool in the optimization toolbox in the external programming environment, so that the constraint minimization tool can iterate through the amplitude and phase data to find the amplitude and phase optimal solution of each transmit channel. Among them, the objective function of the constraint minimization tool includes a data fitting part and a regularization part to prevent overfitting. The iteration range for amplitude data is (1, 2), and the iteration range for phase data is (-π, π). After the objective function converges, the constrained minimization tool ends the control iteration, returns a set of optimal amplitude data and phase data, that is, the target amplitude and phase data, and displays the emission field distribution corresponding to the target amplitude and phase data. The emission field distribution is the radio frequency shimming distribution.
S103、获取仿真软件确定的目标幅相数据对应的功率损耗密度分布数据，并确定功率损耗密度分布数据对应的特定吸收率数据。S103: Acquire power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determine specific absorption rate data corresponding to the power loss density distribution data.
在磁共振成像（Magnetic Resonance Imaging，MRI）中，用于激发质子进动的射频激励脉冲包含电场和磁场两大成分，其中电场会导致功率沉积引起组织产热，国际上使用特定吸收率（Specific Absorption Rate，简称SAR）作为磁共振安全性指标对其评估。本实施例将特定吸收率作为约束条件来实施匀场分析，验证最优匀场时的射频安全性能。In Magnetic Resonance Imaging (MRI), the radio frequency excitation pulse used to excite proton precession contains two major components, electric field and magnetic field. The electric field will cause power deposition and tissue heat generation. Absorption Rate, referred to as SAR) as a magnetic resonance safety index to evaluate it. In this embodiment, the specific absorption rate is used as a constraint condition to perform shimming analysis, and the radio frequency safety performance under optimal shimming is verified.
在一个实施例中，在外部编程环境中，调用仿真软件后处理模块下的电磁计算模板的结果合成器，将目标幅相数据赋值给结果合成器中的各个发射通道，以使结果合成器根据目标幅相数据合成功率损耗密度分布。在检测到功率损耗密度分布生成之后，调用仿真软件后处理模块下的SAR值计算器，并设定计算类型为10g SAR（局部SAR），计算对象为上述合成的功率损耗密度分布，最终得到射频匀场分布对应的人体模型的SAR分布。可以理解的是，根据该SAR分布可确定全局SAR值，将该全局SAR值与局部SAR值存储于外部编程环境中的第二预设存储位置。In one embodiment, in an external programming environment, the result synthesizer of the electromagnetic calculation template under the post-processing module of the simulation software is called, and the target amplitude and phase data are assigned to each transmit channel in the result synthesizer, so that the result synthesizer is based on The target amplitude and phase data are synthesized power loss density distribution. After detecting the generation of the power loss density distribution, call the SAR value calculator under the post-processing module of the simulation software, and set the calculation type to 10g SAR (local SAR), the calculation object is the above synthesized power loss density distribution, and finally obtain the radio frequency The SAR distribution of the human body model corresponding to the shimming distribution. It can be understood that the global SAR value can be determined according to the SAR distribution, and the global SAR value and the local SAR value are stored in a second preset storage location in the external programming environment.
S104、如果特定吸收率数据大于或等于预设阈值，则以目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制仿真软件基于当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对初始仿真数据进行匀场分析以得到目标幅相数据的步骤。S104. If the specific absorption rate data is greater than or equal to a preset threshold, take the target amplitude and phase data as a starting point, generate current amplitude and phase data based on a preset iteration interval, and control the simulation software to perform an electromagnetic simulation operation again based on the current amplitude and phase data to obtain The current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain target amplitude and phase data.
外部编程环境读取存储于第二预设存储位置中的特定吸收率数据，并判断该特定吸收率数据与预设阈值之间的大小关系，如果特定吸收率数据大于或等于预设阈值，则说明目标幅相数据对应的射频匀场分布不能满足射频安全要求，无法用于临床，并以该目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，以及将该当前幅相数据赋值给仿真软件中的射频发射线圈的各个通道，然后控制仿真软件基于当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，并将该初始仿真数据发送至外部编程环境中的第一预设存储位置，外部编程软件从该第一预设存储位置读取该初始仿真数据，并对该初始仿真数据进行匀场分析，即外部编程环境从该第一预设存储位置读取到该初始仿真数据后，返回S102。The external programming environment reads the specific absorptivity data stored in the second preset storage location, and determines the magnitude relationship between the specific absorptivity data and the preset threshold, if the specific absorptivity data is greater than or equal to the preset threshold, then It means that the RF shimming distribution corresponding to the target amplitude and phase data cannot meet the radio frequency safety requirements and cannot be used in clinical practice. Taking the target amplitude and phase data as the starting point, the current amplitude and phase data is generated based on the preset iteration interval, and the current amplitude and phase data are generated based on the preset iteration interval. Assign the value to each channel of the RF transmitting coil in the simulation software, and then control the simulation software to perform the electromagnetic simulation operation again based on the current amplitude and phase data to obtain the current initial simulation data, and send the initial simulation data to the first in the external programming environment. The preset storage location, the external programming software reads the initial simulation data from the first preset storage location, and performs shimming analysis on the initial simulation data, that is, the external programming environment reads the initial simulation data from the first preset storage location. After initial simulation data, return to S102.
其中，幅相数据包括幅度数据和相位数据，幅度数据的迭代范围为（1，2），相位数据的迭代范围为（-π，π）。Among them, the amplitude and phase data includes amplitude data and phase data, the iteration range of the amplitude data is (1, 2), and the iteration range of the phase data is (-π, π).
可以理解的是，如果特定吸收率数据小于预设阈值，则说明当前的目标幅相数据对应的射频匀场分布满足射频安全要求，可用于临床，因此输出射频匀场分布。其中，射频匀场分布包括电磁场分布数据和目标幅相数据。It can be understood that if the specific absorption rate data is less than the preset threshold, it means that the RF shimming distribution corresponding to the current target amplitude and phase data meets the RF safety requirements and can be used in clinical practice, so the RF shimming distribution is output. The radio frequency shimming distribution includes electromagnetic field distribution data and target amplitude and phase data.
其中，特定吸收率数据包括全局SAR值和局部SAR值。可以理解的是，只有在全局SAR值和局部SAR值均小于对应的预设阈值时，才说明当前的目标幅相数据对应的射频匀场分布满足射频安全要求，可用于临床。Among them, the specific absorption rate data includes global SAR value and local SAR value. It can be understood that only when the global SAR value and the local SAR value are both smaller than the corresponding preset thresholds, it means that the RF shimming distribution corresponding to the current target amplitude and phase data meets the RF safety requirements and can be used in clinical practice.
本发明实施例提供的匀场联合仿真方法的技术方案，获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据；对初始仿真数据进行匀场分析以得到目标幅相数据，并将目标幅相数据发送至仿真软件；获取仿真软件确定的目标幅相数据对应的功率损耗密度分布数据，并确定功率损耗密度分布数据对应的特定吸收率数据；如果特定吸收率数据大于或等于预设阈值，则以目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制仿真软件基于当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对初始仿真数据进行匀场分析以得到目标幅相数据的步骤。在外部编程环境中调用并控制电磁仿真软件，实现仿真结果的直接调用并匀场分析的全套操作流程，减少人为干预，使电磁仿真的后处理自动化，且在仿真匀场后充分验证射频安全性，保证结果符合国际通用安全标准，显著提高了匀场仿真的自动批量处理效率和射频安全可用性。The technical solution of the shimming co-simulation method provided by the embodiment of the present invention is to obtain initial simulation data generated by the simulation software performing electromagnetic simulation operations based on the initial configuration data; perform shimming analysis on the initial simulation data to obtain target amplitude and phase data, and use the target The amplitude and phase data are sent to the simulation software; the power loss density distribution data corresponding to the target amplitude and phase data determined by the simulation software is obtained, and the specific absorption rate data corresponding to the power loss density distribution data is determined; if the specific absorption rate data is greater than or equal to the preset threshold , then take the target amplitude and phase data as the starting point, generate the current amplitude and phase data based on the preset iteration interval, and control the simulation software to perform the electromagnetic simulation operation again based on the current amplitude and phase data to obtain the current initial simulation data, and return to the initial simulation data. Steps of shimming analysis to obtain target amplitude and phase data. Call and control the electromagnetic simulation software in the external programming environment, realize the complete operation process of directly calling the simulation results and shimming analysis, reduce human intervention, automate the post-processing of electromagnetic simulation, and fully verify the RF safety after the simulation shimming , to ensure that the results comply with international general safety standards, and significantly improve the automatic batch processing efficiency and RF safety availability of shimming simulation.
实施例二Embodiment 2
图2是本发明实施例提供的匀场联合仿真装置的结构框图。该装置用于执行上述任意实施例所提供的匀场联合仿真方法，该装置可选为软件或硬件实现。该装置包括：FIG. 2 is a structural block diagram of a shimming co-simulation device provided by an embodiment of the present invention. The apparatus is configured to execute the shimming co-simulation method provided in any of the foregoing embodiments, and the apparatus can be optionally implemented in software or hardware. The device includes:
初始仿真数据获取模块11，用于获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据，所述初始配置数据包括射频发射线圈的各个发射通道的初始幅相数据；An initial simulation
匀场分析模块12，用于对所述初始仿真数据进行匀场分析以得到目标幅相数据，并将所述目标幅相数据发送至所述仿真软件；A shimming
功率损耗密度分布数据获取模块13，用于获取所述仿真软件确定的所述目标幅相数据对应的功率损耗密度分布数据，并确定所述功率损耗密度分布数据对应的特定吸收率数据；a power loss density distribution
射频安全验证模块14，用于如果所述特定吸收率数据大于或等于预设阈值，则以所述目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制所述仿真软件基于所述当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对所述初始仿真数据进行匀场分析以得到目标幅相数据的步骤。The radio frequency
可选地，该装置还包括：Optionally, the device also includes:
输出模块，用于如果所述特定吸收率数据小于预设阈值，则输出射频匀场分布。An output module, configured to output a radio frequency shimming distribution if the specific absorption rate data is less than a preset threshold.
可选地，初始仿真数据获取模块用于建立与仿真软件的通信连接；将初始配置数据赋值给所述仿真软件中的射频发射线圈的各个发射通道；控制所述仿真软件基于所述初始配置数据执行电磁仿真操作以生成初始仿真数据，并将初始仿真数据发送至第一预设存储位置；在检测到所述仿真软件完成所述电磁仿真操作时，从所述第一预设存储位置读取所述初始仿真数据。Optionally, the initial simulation data acquisition module is used to establish a communication connection with the simulation software; assign the initial configuration data to each transmission channel of the radio frequency transmitting coil in the simulation software; control the simulation software based on the initial configuration data performing an electromagnetic simulation operation to generate initial simulation data, and sending the initial simulation data to a first preset storage location; when detecting that the simulation software has completed the electromagnetic simulation operation, read from the first preset storage location the initial simulation data.
可选地，初始仿真数据获取模块用于通过预先创建的接口指针调用仿真软件中的结果合成器对所述初始配置数据进行电磁仿真计算，以生成所述初始配置数据对应的初始仿真数据。Optionally, the initial simulation data acquisition module is configured to call a result synthesizer in the simulation software to perform electromagnetic simulation calculation on the initial configuration data through a pre-created interface pointer, so as to generate initial simulation data corresponding to the initial configuration data.
可选地，所述特定吸收率数据包括全局SAR值和局部SAR值。Optionally, the specific absorption rate data includes global SAR values and local SAR values.
可选地，所述幅相数据包括幅度数据和相位数据，所述幅度数据的迭代范围为（1，2），所述相位数据的迭代范围为（-π，π）。Optionally, the amplitude and phase data includes amplitude data and phase data, the iteration range of the amplitude data is (1, 2), and the iteration range of the phase data is (-π, π).
可选地，所述初始仿真数据为圆极化模式下的发射场分布数据。Optionally, the initial simulation data is emission field distribution data in a circular polarization mode.
本发明实施例提供的匀场联合仿真装置的技术方案，通过初始仿真数据获取模块获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据，通过匀场分析模块对初始仿真数据进行匀场分析以得到目标幅相数据，并将目标幅相数据发送至仿真软件；通过功率损耗密度分布数据获取模块获取仿真软件确定的目标幅相数据对应的功率损耗密度分布数据，并确定功率损耗密度分布数据对应的特定吸收率数据；通过射频安全验证模块在特定吸收率数据大于或等于预设阈值时，以目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制仿真软件基于当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对初始仿真数据进行匀场分析以得到目标幅相数据的步骤。在外部编程环境中调用并控制电磁仿真软件，实现仿真结果的直接调用并匀场分析的全套操作流程，减少人为干预，使电磁仿真的后处理自动化，且在仿真匀场后充分验证射频安全性，保证结果符合国际通用安全标准，在保证射频安全可用性的前提下显著提高了匀场仿真的自动批量处理效率。In the technical solution of the shimming co-simulation device provided by the embodiment of the present invention, the initial simulation data generated by the simulation software performing the electromagnetic simulation operation based on the initial configuration data is obtained through the initial simulation data acquisition module, and the initial simulation data is shimming through the shimming analysis module. Analyze to obtain the target amplitude and phase data, and send the target amplitude and phase data to the simulation software; obtain the power loss density distribution data corresponding to the target amplitude and phase data determined by the simulation software through the power loss density distribution data acquisition module, and determine the power loss density distribution The specific absorption rate data corresponding to the data; when the specific absorption rate data is greater than or equal to the preset threshold through the radio frequency safety verification module, the target amplitude and phase data are used as the starting point, and the current amplitude and phase data are generated based on the preset iteration interval, and the simulation software is controlled based on Perform electromagnetic simulation operations again on the current amplitude and phase data to obtain current initial simulation data, and return to the step of performing shimming analysis on the initial simulation data to obtain target amplitude and phase data. Call and control the electromagnetic simulation software in the external programming environment, realize the complete operation process of directly calling the simulation results and shimming analysis, reduce human intervention, automate the post-processing of electromagnetic simulation, and fully verify the RF safety after the simulation shimming , to ensure that the results comply with international general safety standards, and significantly improve the automatic batch processing efficiency of shimming simulation on the premise of ensuring the safety and availability of RF.
本发明实施例所提供的匀场联合仿真装置可执行本发明任意实施例所提供的匀场联合仿真方法，具备执行方法相应的功能模块和有益效果。The shimming co-simulation device provided by the embodiment of the present invention can execute the shimming co-simulation method provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects of the execution method.
实施例三Embodiment 3
图3为本发明实施例提供的电子设备的结构示意图，如图3所示，该设备包括处理器201、存储器202、输入装置203以及输出装置204；设备中处理器201的数量可以是一个或多个，图3中以一个处理器201为例；设备中的处理器201、存储器202、输入装置203以及输出装置204可以通过总线或其他方式连接，图3中以通过总线连接为例。FIG. 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. As shown in FIG. 3 , the device includes a
存储器202作为一种计算机可读存储介质，可用于存储软件程序、计算机可执行程序以及模块，如本发明实施例中的匀场联合仿真方法对应的程序指令/模块（例如，初始仿真数据获取模块11、匀场分析模块12、功率损耗密度分布数据获取模块13以及射频安全验证模块14）。处理器201通过运行存储在存储器202中的软件程序、指令以及模块，从而执行设备的各种功能应用以及数据处理，即实现上述的匀场联合仿真方法。As a computer-readable storage medium, the
存储器202可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序；存储数据区可存储根据终端的使用所创建的数据等。此外，存储器202可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。在一些实例中，存储器202可进一步包括相对于处理器201远程设置的存储器，这些远程存储器可以通过网络连接至设备。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。The
输入装置203可用于接收输入的数字或字符信息，以及产生与设备的用户设置以及功能控制有关的键信号输入。The
输出装置204可包括显示屏等显示设备，例如，用户终端的显示屏。The
实施例四Embodiment 4
本发明实施例还提供了一种包含计算机可执行指令的存储介质，所述计算机可执行指令在由计算机处理器执行时用于执行一种匀场联合仿真方法，该方法包括：Embodiments of the present invention also provide a storage medium containing computer-executable instructions, where the computer-executable instructions are used to execute a shim co-simulation method when executed by a computer processor, and the method includes:
获取仿真软件基于初始配置数据执行电磁仿真操作生成的初始仿真数据，所述初始配置数据包括射频发射线圈的各个发射通道的初始幅相数据；Obtaining initial simulation data generated by the simulation software by performing an electromagnetic simulation operation based on the initial configuration data, where the initial configuration data includes initial amplitude and phase data of each transmitting channel of the radio frequency transmitting coil;
对所述初始仿真数据进行匀场分析以得到目标幅相数据，并将所述目标幅相数据发送至所述仿真软件；Perform shimming analysis on the initial simulation data to obtain target amplitude and phase data, and send the target amplitude and phase data to the simulation software;
获取所述仿真软件确定的所述目标幅相数据对应的功率损耗密度分布数据，并确定所述功率损耗密度分布数据对应的特定吸收率数据；Acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data;
如果所述特定吸收率数据大于或等于预设阈值，则以所述目标幅相数据为起点，基于预设迭代间隔生成当前幅相数据，并控制所述仿真软件基于所述当前幅相数据再次执行电磁仿真操作以得到当前的初始仿真数据，以及返回对所述初始仿真数据进行匀场分析以得到目标幅相数据的步骤。If the specific absorption rate data is greater than or equal to a preset threshold, taking the target amplitude and phase data as a starting point, generating current amplitude and phase data based on a preset iteration interval, and controlling the simulation software to repeat the current amplitude and phase data based on the current amplitude and phase data Performing an electromagnetic simulation operation to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain target amplitude and phase data.
当然，本发明实施例所提供的一种包含计算机可执行指令的存储介质，其计算机可执行指令不限于如上所述的方法操作，还可以执行本发明任意实施例所提供的匀场联合仿真方法中的相关操作。Of course, a storage medium containing computer-executable instructions provided by an embodiment of the present invention, the computer-executable instructions of which are not limited to the above-mentioned method operations, and can also execute the shimming co-simulation method provided by any embodiment of the present invention. related operations in .
通过以上关于实施方式的描述，所属领域的技术人员可以清楚地了解到，本发明可借助软件及必需的通用硬件来实现，当然也可以通过硬件实现，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如计算机的软盘、只读存储器（Read-Only Memory，简称ROM）、随机存取存储器（RandomAccess Memory， 简称RAM）、闪存（FLASH）、硬盘或光盘等，包括若干指令用以使得一台计算机设备（可以是个人计算机，服务器，或者网络设备等）执行本发明各个实施例所述的匀场联合仿真方法。From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by software and necessary general-purpose hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment . Based on such understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in a computer-readable storage medium, such as a floppy disk of a computer , Read-Only Memory (ROM for short), Random Access Memory (RAM for short), Flash Memory (FLASH), hard disk or CD, etc., including several instructions to make a computer device (which can be a personal computer, server, or network device, etc.) to execute the shim co-simulation method described in each embodiment of the present invention.
值得注意的是，上述匀场联合仿真装置的实施例中，所包括的各个单元和模块只是按照功能逻辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；另外，各功能单元的具体名称也只是为了便于相互区分，并不用于限制本发明的保护范围。It is worth noting that, in the embodiment of the above-mentioned shimming co-simulation device, the units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; , the specific names of the functional units are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present invention.
注意，上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解，本发明不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此，虽然通过以上实施例对本发明进行了较为详细的说明，但是本发明不仅仅限于以上实施例，在不脱离本发明构思的情况下，还可以包括更多其他等效实施例，而本发明的范围由所附的权利要求范围决定。Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.
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