A kind of synthetic aperture supersonic imaging device and methodTechnical field
The present invention relates to medical supersonic detecting devices field, more particularly to a kind of synthetic aperture supersonic imaging device and sideMethod.
Background technology
Medical ultrasound image technology plays an important role in modern medicine image technology, with other diagnostic imaging skillsArt is compared, real-time, noninvasive, the portable and inexpensive favor for being particularly subject to medical personnel and patient of ultrasonic diagnostic imaging.To the greatest extentPipe is in this way, the portable contradiction between diagnostic image of ultrasonic imaging solves still without sufficient.Current ultrasonic diagnostic equipmentPhysical channel number limitation due to ultrasonic system on the premise of image property is ensured in itself is still unable to reach as mobile communicationThe same portable convenient of equipment.
Weighing the leading indicator of diagnostic ultrasound images includes：Image spatial resolution, the contrast of image, the time of imageResolution ratio.The port number of ultrasonic system fundamentally determines above index, while also determines the area of system, volume etc. justTake formula index.Current portable ultrasound system is provided to ensure the quality of image, can not be carried out on system channel number appropriateAssociation, device area and volume on channel link can only be reduced by the improvement of electronic fabrication processes technology, is met as far as possiblePortable requirement.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of synthetic aperture supersonic imaging device and method, for existingThere is the deficiency in technology, with the portable breakthrough for optimizing the complexity of system He realizing ultrasonic system, solve Ultrasonic Diagnosis and setThe standby physical channel number limitation on the premise of image property is ensured due to ultrasonic system in itself is still unable to reach as mobile logicalThe problem of interrogating equipment the same portable convenient.
To reach above-mentioned purpose, technical scheme is as follows：A kind of synthetic aperture supersonic imaging device, including ultrasoundHost computer system, image display system, data handling system and ultrasound transducer system；The ultrasonic host computer system is to include FPGAThe Vltrasonic device main body of processor；The ultrasound transducer system is connected with the ultrasonic host computer system；The ultrasonic transducerSystem is used to launch and receive ultrasonic wave, and realizes the conversion of electric signal and ultrasonic wave；The data handling system is to described superThe electric signal of acoustic transducer system feedback carries out data processing and forms image information；Described image display system to the data atThe image information that reason system is formed carries out image and shown.
As a kind of preferred scheme of said apparatus, the ultrasound transducer system includes probe, energy applicator, mouldIntend front-end module, send reception selecting switch；The analog front-end module includes voltage control Amplifier and analog-to-digital conversion；It is describedAnalog front-end module, transmission receive selecting switch, energy applicator, probe and are sequentially connected.
As a kind of preferred scheme of said apparatus, the FPGA processor includes driver element, ultrasound unit, wave beam and closedInto unit and low-pass filter unit；The driver element is connected with the energy applicator to drive the energy to apply dressPut；The ultrasound unit is connected to control ultrasound transducer system to launch and receive ultrasound with the reception selecting switch that sendsRipple；The Beam synthesis unit carries out synthesis processing to wave beam；The low-pass filter unit carries out low pass filtered to the wave beam of synthesisRipple processing.
As a kind of preferred scheme of said apparatus, the data handling system includes the demodulation to signal, filtering, coordinateThe data processing of conversion.
A kind of synthetic aperture ultrasonic imaging method, the synthetic aperture supersonic imaging device described in usage right requirement 1, and lead toCross the scanning that in the following manner carries out a two field picture：
S1：Be controlled by the ultrasonic host computer system, control the ultrasound transducer system from side to opposite side withSynthesis emission mode is launched, and tissue is scanned；Emission mode is synthesized according to configuration, is led to every time with system physicalThe maximum of road number is launched；
S2：Switch ultrasonic engine control system, switch to synthesize corresponding synthesis reception pattern under emission mode, receiving channelData, carry out synthesizing emission mode and synthesize the Beam synthesis processing under reception pattern, the scanning beam of formation is in data processingCaching process is carried out in system.
S3：The synthesis emission mode and synthesis reception pattern in S1-S2 are repeated, emission mode is synthesized each time and synthesis connectsReceive in pattern cycle and processing all is overlapped to the wave beam and the last wave beam formed of this formation, until whole synthesis transmittingScan line is formed after pattern and synthesis reception pattern.
S4：Scan line forms image by the data handling system, and carrying out ultrasound by described image display system examinesThe display of disconnected image.
As the further improvement of the above method, emission array combination is determined in S1；S1 also includes：
The number x of array element in emission mode, the port number c of system are determined, determines that standard corresponding to x array element focuses on and prolongsWhen, array combination n >=fix (x/c) of transmitting；
As the further improvement of the above method, receiving array combination is determined in S2；S2 also includes：
The number y of array element in reception pattern, the port number c of system are determined, determines that standard corresponding to y array element focuses on and prolongsWhen, array combination m >=fix (y/c) of reception；
As the further improvement of the above method, S3 also includes：
S3.1：The individual launching beams of max (m, n) can be obtained altogether and receive wave beam, and often one wave beam of formation all enters line delay and foldedAdd processing, complete scan line is formed after being all disposed to the individual wave beams of max (m, n)；
S3.2：By configuring different delay parameters, a plurality of complete scan line can be formed, and these scan lines are existedCaching process is carried out in data handling system；
As the further improvement of the above method, S4 also includes：
To the multi-strip scanning line formed in S3,1 scan-line data is chosen successively and carries out data processing formation view data,In the process, while S3 steps are carried out, reaches and form new number of scanning lines again after serial process finishes scan-line dataAccording to.
Pass through above-mentioned technical proposal, the notable beneficial effect of technical solution of the present invention are：
Acoustical power is low：Compared with 32 and above channel system of routine, the present invention is according to 8 channel systems, then transmission powerAt least it is reduced to 1/4.In the special application field required to ultrasound emission power, can play an important role.
Image quality is high：Compared to traditional low channel system, the present invention is effectively improved passage by extending apertureData volume, improve the contrast and spatial resolution of image；By a kind of processing procedure of multi-beam, compensate for due to apertureThe problem of temporal resolution caused by extension declines so that the temporal resolution of system meets the needs of clinical practice.
Control mode is flexible, low in energy consumption：The combination that induction and conclusion is launched and received, formed under fixed physical port numberSynthetic aperture inductive method, control different send-receives to combine by host computer system, realize that the resource of multi multiplexing is matched somebody with somebodyPut；The time of send-receive process is made full use of in data processing module simultaneously, serial process multi-strip scanning line, is also realizedThe resource distribution of multi multiplexing, especially multiplier resources, greatly reduce the consumption of resource, are easy to select in Project RealizationThe functional chip of even lower level, reduce power consumption and area.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existingThere is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only thisSome embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be withOther accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the synthetic aperture supersonic imaging device of the present invention.
Fig. 2 is the basic flow sheet of the synthetic aperture imaging principle of the present invention.
Fig. 3 is the synthesis model schematic diagram of the synthetic aperture imaging of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, completeSite preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based onEmbodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not madeEmbodiment, belong to the scope of protection of the invention.
With reference to Fig. 1, the invention provides a kind of synthetic aperture supersonic imaging device, including ultrasonic host computer system, image to showShow system, data handling system and ultrasound transducer system.The ultrasonic host computer system is to include the ultrasound dress of FPGA processorPut main body.The ultrasound transducer system is connected with the ultrasonic host computer system.The ultrasound transducer system be used for launch andUltrasonic wave is received, and realizes the conversion of electric signal and ultrasonic wave.The data handling system is anti-to the ultrasound transducer systemThe electric signal of feedback carries out data processing and forms image information.The figure that described image display system is formed to the data handling systemShown as information carries out image.
Specifically, the ultrasound transducer system includes probe, energy applicator, analog front-end module, transmission receptionSelecting switch；The analog front-end module includes voltage control Amplifier and analog-to-digital conversion；The analog front-end module, transmission connectSelecting switch, energy applicator, probe is received to be sequentially connected.The FPGA processor includes driver element, ultrasound unit, wave beamSynthesis unit and low-pass filter unit；The driver element is connected with the energy applicator to drive the energy to apply dressPut；The ultrasound unit is connected to control ultrasound transducer system to launch and receive ultrasound with the reception selecting switch that sendsRipple；The Beam synthesis unit carries out synthesis processing to wave beam；The low-pass filter unit carries out low pass filtered to the wave beam of synthesisRipple processing.The data handling system includes demodulation, filtering, the data processing of Coordinate Conversion to signal.
A kind of synthetic aperture ultrasonic imaging method, the synthetic aperture supersonic imaging device described in usage right requirement 1, and lead toCross the scanning that in the following manner carries out a two field picture：
S1：Be controlled by the ultrasonic host computer system, control the ultrasound transducer system from side to opposite side withSynthesis emission mode is launched, and tissue is scanned；Emission mode is synthesized according to configuration, is led to every time with system physicalThe maximum of road number is launched；
S2：Switch ultrasonic engine control system, switch to synthesize corresponding synthesis reception pattern under emission mode, receiving channelData, carry out synthesizing emission mode and synthesize the Beam synthesis processing under reception pattern, the scanning beam of formation is in data processingCaching process is carried out in system.
S3：The synthesis emission mode and synthesis reception pattern in S1-S2 are repeated, emission mode is synthesized each time and synthesis connectsReceive in pattern cycle and processing all is overlapped to the wave beam and the last wave beam formed of this formation, until whole synthesis transmittingScan line is formed after pattern and synthesis reception pattern.
S4：Scan line forms image by the data handling system, and carrying out ultrasound by described image display system examinesThe display of disconnected image.
As the supplement to the above method and optimization：
S1 also includes：The number x of array element in emission mode, the port number c of system are determined, determines to mark corresponding to x array elementStandard focuses on delay, array combination n >=fix (x/c) of transmitting；
S2 also includes：The number y of array element in reception pattern, the port number c of system are determined, determines to mark corresponding to y array elementStandard focuses on delay, array combination m >=fix (y/c) of reception；
S3.1：The individual launching beams of max (m, n) can be obtained altogether and receive wave beam, and often one wave beam of formation all enters line delay and foldedAdd processing, complete scan line is formed after being all disposed to the individual wave beams of max (m, n)；
S3.2：By configuring different delay parameters, a plurality of complete scan line can be formed, and these scan lines are existedCaching process is carried out in data handling system；
To the multi-strip scanning line formed in S3,1 scan-line data is chosen successively and carries out data processing formation view data,In the process, while S3 steps are carried out, reaches and form new number of scanning lines again after serial process finishes scan-line dataAccording to.
With reference to Fig. 2, Fig. 3, it is assumed that kth time scan mode, this scanning form q bar scan lines altogether, and whole two field picture shares k*qBar scan line.The individual send-receive wave beam of each common max (m, n) of scan mode, the synthesis model of order wherein once is i.
Synthesize i-th kind of emission mode in the kth time scanning of emission mode and be expressed as Tki, wherein i=[1, max (m,n)].After battery has fired, it is immediately switched to synthesize i-th kind of reception pattern in the kth time scanning of reception pattern, is expressed as Rki.Then the q bars scanning obtained under Tki-Rki transmission and reception patterns is cached in a data processing system according to different delay parametersWave beam Bi1~Biq.As i=max (m, n), represent that this synthetic aperture is scanned, it is B1 to obtain the complete scan line of q bars~Bq.
Formed after q bar scan lines, carry out+1 scanning of kth, repeat its transmission reception pattern, launch in ith and receive mouldIn formula, in addition to carrying out this Beam synthesis and scanning, while it is demodulated according to the i wave beams formed successively to kth time, is filteredThe data processings such as ripple.All wave beams are all handled using same demodulation filtering data processing module, in whole serial linkOn, the processing procedure requires the wave beam number q≤max (m, n) to be formed.
After k*q bar scan lines are formed, the scan image of a frame is formed.
In synthetic aperture imaging principle process in fig. 2, carried out in detail by Fig. 3 for the synthesis model launched and receivedIt is thin to illustrate.
In ith emission process, from corresponding transmitting array element, in i receive process, corresponding reception is switched toPattern.Launching with receive process, the communication channel delay value of every kind of combination refers to equation below：
Wherein, τ represents to receive or the delay time of transmitting, c represent the velocity of sound, and z represents transmitting or receives the depth of focus,D is the size in aperture.
During synthetic aperture, the formation of wave beam each time is synthesized by equation below：
S (t)=∑ wiSi(t-τi)
Si(t) it is echo-signal；wiFor matched filter weighted value, caused distance in image after being superimposed for suppressionSecondary lobe；τiFor time delay；Subscript i represents transducer channel number.Pass through above-mentioned specific embodiment, beneficial effects of the present inventionIt is：Acoustical power is low：Compared with 32 and above channel system of routine, the present invention at least drops according to 8 channel systems, then transmission powerAs little as 1/4.In the special application field required to ultrasound emission power, can play an important role.
Image quality is high：Compared to traditional low channel system, the present invention is effectively improved passage by extending apertureData volume, improve the contrast and spatial resolution of image；By a kind of processing procedure of multi-beam, compensate for due to apertureThe problem of temporal resolution caused by extension declines so that the temporal resolution of system meets the needs of clinical practice.
Control mode is flexible, low in energy consumption：The combination that induction and conclusion is launched and received, formed under fixed physical port numberSynthetic aperture inductive method, control different send-receives to combine by host computer system, realize that the resource of multi multiplexing is matched somebody with somebodyPut；The time of send-receive process is made full use of in data processing module simultaneously, serial process multi-strip scanning line, is also realizedThe resource distribution of multi multiplexing, especially multiplier resources, greatly reduce the consumption of resource, are easy to select in Project RealizationThe functional chip of even lower level, reduce power consumption and area.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined hereinGeneral Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the inventionThe embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase oneThe most wide scope caused.