CN1915176A - Method for raising image frequency in joint of multiple emission focuses - Google Patents
Method for raising image frequency in joint of multiple emission focuses Download PDFInfo
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- CN1915176A CN1915176A CN 200510036793 CN200510036793A CN1915176A CN 1915176 A CN1915176 A CN 1915176A CN 200510036793 CN200510036793 CN 200510036793 CN 200510036793 A CN200510036793 A CN 200510036793A CN 1915176 A CN1915176 A CN 1915176A
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Abstract
A method for increasing the frame rate in multiple focuses splice of echo signals includes such steps as ultrasonic scanning multiple times from each emitting focus for each scanned position, receiving the ultrasonic echo signals of each emitting, synthesizing wave beams for increasing S/N ratio, and multiple focuses splicing to obtain the complete echo signal or data of each scan line.
Description
Technical field the present invention relates to ultrasonic technique, and particularly pilosity is penetrated the emission reception control technology in the focus ultrasonic image-forming system, especially relates to the method that improves the image mosaic frame per second.
Background technology is in the wave beam of conventional medical ultrasonic image-forming system forms, need receive the every bit pointwise dynamic focusing on the received scanline, it is exactly acceptance point to the variant degree of depth, by changing the echo time-delay that each array element of probe receives and the receiving aperture of probe array element continuously, make that the reception to described each point all can reach focusing effect.
But the method for this dynamic focusing can only be used for receiving, and can not be used for emission.Because when pulse is each time launched, regulate the pore size of probe emission array element and the time-delay of each array element, can make transmitted pulse focus on some focuses on the transmit scan line; In a single day but transmitted pulse is launched out, and its emission focus just no longer can be adjusted.Like this, be deeper than the degree of depth of non-focus area, transmitted pulse can be dispersed, and can not focus on preferably.Generally can reduce this emission focusing error by reducing the transmitting aperture.But reduce the transmitting aperture transmitted pulse bandwidth is broadened, thereby reduce the lateral resolution of image, influence picture quality.
Described emission focusing and the opposed problem of transmitted pulse bandwidth can use the multi-focal point mosaic method to solve traditionally.Described multi-focal point mosaic is divided into several zones with received scanline along the degree of depth exactly, each zone corresponding different emission focuses; For each zone, the focus that emission focuses on approximately is positioned at regional center, still adopts the dynamic focusing method and receive echo at every turn.Like this, system needs repeatedly transmitted pulse, launches all differences of focus at every turn; When receiving the echo of each emission focus area, only keep near the echo data in this zone for further processing, and give up other echo datas; At last, the echo segment that system launches the focus correspondence with difference combines, and just forms a complete received scanline.Thereby described received scanline allows that transmitted pulse has narrower bandwidth in each zone, to improve the lateral resolution and the picture quality of image.
Multi-focal point mosaic ultrasonic system with Fig. 1 signal is an example.In this ultrasonic image-forming system, have the ultrasonic transducer (probe) of array element more than one, master control system can switch hyperacoustic transmitting and receiving in real time by the control transmit/receive module.When switching to the ultrasonic emitting state, each piezoelectric ceramics array element of this ultrasonic transducer receives the driving pulse from the transmitted pulse module, becomes ultrasound wave to launch the power conversion of this driving pulse.When switching to the ultrasound wave accepting state, each array element of described ultrasonic transducer receives ultrasonic echo independently, converts ultrasonic energy to electric flux.
When ultra sonic imaging, transmit/receive module is switched to emission state earlier, system controls exomonental shape, time-delay by the transmitted pulse control module, and the array element that participates in emission, makes ultrasonic waves transmitted focus on the predetermined focal position of being scheduled on the scanning line.Like this, described emission ultrasound wave is the narrowest in this focus place bandwidth, and can broad in other locational bandwidth of scanning line.This multi-focal point mosaic system generally will be on the position of same transmit scan line, repeatedly continuous transmitted pulse, and the number of number of times and multi-focal point mosaic is identical, and each exomonental focus is difference by the emission delay that changes each array element.Then, described transmit/receive module switches to accepting state, and ultrasonic echo receives through each array element of ultrasonic transducer and converts the signal of telecommunication to.This signal of telecommunication amplifies through the time gain compensation amplifier earlier, with the ultrasonic attenuation under the compensation different depth; Be sent to the wave beam synthesis module again, adjust the time-delay of each array element echo and become mark, to improve the signal to noise ratio of current received scanline echo-signal.Described change mark is meant each passage echo before the echo addition of different passages be multiply by certain coefficient that wherein, trace-changing coefficient will change along with degree of depth difference, and the same with the echo time-delay, be controlled adjustment (indicating among the figure) by system CPU.
Echo-signal after wave beam is synthetic generally also will improve signal to noise ratio through dynamic filter.The filter center frequency of described dynamic filter and frequency band will be different and change along with the echo degree of depth.Because composition longitudinal resolution in image that echo frequency is high is higher, but bigger with the attenuation ratio of the degree of depth; Composition longitudinal resolution in image that echo frequency is low is lower, but the decay with the degree of depth is slow, can detect the darker degree of depth, so what dynamic filter was realized is: the radio-frequency component (guaranteeing that the image longitudinal resolution is higher) of selecting signal in the more shallow place of investigation depth, then select the low-frequency component (guaranteeing the investigation depth of system) of signal in the darker place of investigation depth, for system imaging.
Echo-signal frequency behind dynamic filter is still higher, still belongs to radiofrequency signal, also will obtain the envelope of echo-signal through envelope detected.Described envelope detected can adopt the method for the absolute value of echo-signal being made low-pass filtering; Also can adopt the method that the two-way orthogonal signalling delivery after the quadrature demodulation is detected.Because it is slower that envelope signal changes, frequency is lower, so it is lower that the signal after the envelope detected is carried out analog-to-digital sample rate.
If described transmitted pulse is not corresponding last emission focus, then described envelope detected and data after A are sent to the buffer memory of multi-focal point mosaic module.The echo data that is kept at the same transmit scan line in this buffer memory can produce the view data of a complete scan line after multi-focal point mosaic is handled.System is sent to display module with spliced scan-line data one by one.This display module can be made corresponding display process to data according to system's characteristics, such as can polar data being transformed into the dot array data that shows on the screen by scan conversion.Fig. 3 has represented the splicing signal sketch map that obtains behind the jointing echo signals of multiple emission focuses.The echo-signal of the scanning line correspondence of same scanning position is a system after transmitting and receiving for three times, and the echo that receives for three times is handled in the splicing of different receiving areas and synthesized complete reception echo.
Because during multi-focal point mosaic, need the repeatedly impulse wave of the different emission of emission focus, the pulse echo of difference emission focus is spliced, form the data of complete received scanline at last; So the frame per second of last image can reduce.In general, if adopt n focus emission, the image frame per second will drop to original 1/n.For this reason, U.S. Pat 6,432,056 discloses a kind of method of utilizing multi-beam to receive to improve multi-focal point mosaic image frame per second.Specifically be, receive in the ultrasonic system that corresponding scan line position is T when launching as if the first time in multi-beam
1, the emission focus is near probe, and received scanline is with T
1For centrosymmetry distributes, its position is respectively R
1LAnd R
1RThen order is for the second time launched the corresponding scanning line position and is and T
1The T that does not overlap
2, the emission focus is away from probe, and received scanline is with T
2For the both sides, center are symmetrically distributed, be respectively R
2LAnd R
2RMake wherein R
1RAnd R
2LReceiving position identical, but launch focus and inequality; R then
1RAnd R
2LAll satisfy the multi-focal point mosaic condition.Like this, to R
1RAnd R
2LCarry out focal point mosaic, just can form the multi-focal point mosaic image.Use this method, need be in same scan line position repeat its transmission, therefore the image frame per second can be improved.
The main deficiency of above-mentioned prior art is: US 6,432, though 056 disclosed method can improve the image frame per second of multi-focal point mosaic, this system front end needs to support that multi-beam receives, and has improved system complexity and has realized cost; And the lift-off technology that this system adopts can make the image lateral resolution descend to some extent.
The summary of the invention the technical problem to be solved in the present invention is at above-mentioned the deficiencies in the prior art, and a kind of method that improves the image frame per second is proposed, when ultrasonic image-forming system adopts jointing echo signals of multiple emission focuses to obtain scanogram, use the inventive method, can improve the image frame per second, simultaneously do not influence spliced picture quality, and make system have lower realization cost.
For solving the problems of the technologies described above, of the present inventionly be contemplated that substantially:, be set the short echo received pulse repetition period for the more shallow transmitted pulse in emission focal position; For the darker transmitted pulse in emission focal position, be set the long echo received pulse repetition period.Can reduce the total spended time that forms a received scanline like this, thereby improve imaging frame rate, the while does not influence the picture quality behind the multi-focal point mosaic.
As the technical scheme that realizes the present invention's design be, provide a kind of pilosity to penetrate the method that improves the image frame per second in the focal point mosaic, be used to adopt jointing echo signals of multiple emission focuses to obtain the ultrasonic image-forming system of scanogram, comprise and switch the step of carrying out repeatedly:
A. system scans target, carries out repeatedly the ultrasonic emitting of different emission focuses at each scanning position;
B. system receives the ultrasonic echo after at every turn launching;
Also comprise the steps, receive the processing of ultrasonic echo in order to finish system docking:
C. echo-signal is carried out the synthetic processing of wave beam, to improve signal to noise ratio;
D. dynamic filter is handled, envelope detected is handled and multi-focal point mosaic is handled to carrying out through the synthetic echo-signal of handling of described wave beam, to obtain complete echo-signal of each scanning line or data;
It is characterized in that:
Among the described step B, when system receives ultrasonic echo after each emission, be according to different emission focuses, and adopt the different pulse repetition periods to receive.
In the such scheme, echo-signal described in the step D is handled through multi-focal point mosaic earlier, handles through dynamic filter processing and envelope detected successively again.
In the such scheme, echo-signal described in the step D is handled through dynamic filter earlier, handles through multi-focal point mosaic processing and envelope detected successively again.
Adopt technique scheme, the picture frame rate is descended reduce, guarantee that simultaneously the image effect behind the multi-focal point mosaic is constant, and system has lower realization cost.
Description of drawings Fig. 1 is one of multi-focal point mosaic ultrasonic system schematic block diagram
Fig. 2 is two of a multi-focal point mosaic ultrasonic system schematic block diagram
Fig. 3 is the ultrasonoscopy sketch map behind the multi-focal point mosaic
Fig. 4 is the emission sketch map of traditional multi-focal point mosaic ultrasonic system
Fig. 5 is the emission sketch map of multi-focal point mosaic ultrasonic system of the present invention
Below the specific embodiment, the most preferred embodiment shown in is further set forth the present invention in conjunction with the accompanying drawings.
The inventive method is not only applicable to ultrasonic image-forming system shown in Figure 1, can also be applicable to that other adopts jointing echo signals of multiple emission focuses to obtain the ultrasonic image-forming system of scanogram.Comprise another system block diagram as shown in Figure 2, different among this system and Fig. 1 is that the position of described multi-focal point mosaic module is before described envelope detected module.In addition, described ultrasonic image-forming system can be the ultrasonic image-forming system of simple beam emission, also can be the ultrasonic image-forming system that many corresponding different beams scanning lines are launched, can be obtained simultaneously to multi-beam.
Obtain in the ultrasonic image-forming system of scanogram at described employing jointing echo signals of multiple emission focuses, the inventive method comprises switches the step of carrying out repeatedly:
A. system scans target, carries out repeatedly the ultrasonic emitting of different emission focuses at each scanning position;
B. system receives the ultrasonic echo after at every turn launching;
Also comprise the steps, receive the processing of ultrasonic echo in order to finish system docking:
C. echo-signal is carried out the synthetic processing of wave beam, to improve signal to noise ratio;
D. dynamic filter is handled, envelope detected is handled and multi-focal point mosaic is handled to carrying out through the synthetic echo-signal of handling of described wave beam, to obtain complete echo-signal of each scanning line or data;
Wherein, the processing of multi-focal point mosaic described in the step D is each scanning position repeatedly to be launched the back receive the echo-signal that the echo-signal of handling is spliced into complete scan line correspondence.This multi-focal point mosaic to echo-signal is handled and can be carried out after the synthetic processing of wave beam as Fig. 2, also can carry out after dynamic filter is handled; Or can after handling, envelope detected carry out as Fig. 1.Because of its splicing processing method is not the key that the present invention deals with problems, the inventive method is not subjected to the restriction that concrete splicing is handled simultaneously, so do not give unnecessary details at this.
Fig. 4 has provided the emission sketch map of traditional multi-focal point mosaic ultrasonic system.With (but being not limited to) three emission focus is example, and the focal position of establishing emission for the first time is from probe recently, and is secondary in the centre, last from probe farthest.If the order of system's emission is successively: first focus of scanning line K, second focus of scanning line K, the 3rd focus of scanning line K, first focus of scanning line K+1; And the pulse repetition period between every twice emitting is identical, is made as T; Then multi-focal point mosaic needed time of received scanline of formation is 3T.When therefore, the ultrasonic system imaging frame rate will drop to non-multi-focal point mosaic 1/3.
As shown in Figure 3, for the echo-signal of splicing back between the area part of zone 1 and 2 intersections, generally be to adopt weighting to handle synthetic to the former received signal of these two parts, and the former reception echo-signal that surpasses this intersection region part is not contributed the composite signal of this part, that is to say, the echo of the first emission focus, the echo that receives above the 12 back times of intersection region does not influence spliced echo, to not influence of imaging.Therefore, when receiving the echo of the first emission focus, only need receive and comprise that the intersection region is with interior corresponding echo.Equally, to second the emission focus echo can and the like.
For this reason, the emission mode that ultrasonic system of the present invention adopts can make among the described step B as shown in Figure 5, when system receives ultrasonic echo after each emission, is according to different emission focuses, and adopts the different pulse repetition periods to receive.If the pulse repetition period during the conventional ultrasonic systems emission scan is T.When adopting multi-focal point mosaic, if the pulse repetition period of the first focus correspondence of scanning line K is T1, the pulse repetition period of the second focus correspondence is T2, and the pulse repetition period of the 3rd focus correspondence is T3, then respectively launch focus, there is no need to receive all echo-signals because of correspondence.The described pulse repetition period can change with the distance between described emission focus and the ultrasonic transducer; Distance is more little then should the pulse repetition period short more.So T1＜T2＜T3, and T3=T is T1+T2+T3 so form a needed time of received scanline, less than original needed 3T.Thereby, can alleviate the imaging frame rate decline problem that multi-focal point mosaic causes.
The inventive method does not need to change the hardware of ultrasonic image-forming system through verification experimental verification, only adjusts the control of ultra sonic imaging, the image imaging frame per second in the time of just improving multi-focal point mosaic, and also picture quality remains unchanged.
Claims (5)
1. a pilosity is penetrated the method that improves the image frame per second in the focal point mosaic, is used to adopt jointing echo signals of multiple emission focuses to obtain the ultrasonic image-forming system of scanogram, comprises switching the step of carrying out repeatedly:
A. system scans target, carries out repeatedly the ultrasonic emitting of different emission focuses at each scanning position;
B. system receives the ultrasonic echo after at every turn launching;
Also comprise the steps, receive the processing of ultrasonic echo in order to finish system docking:
C. echo-signal is carried out the synthetic processing of wave beam, to improve signal to noise ratio;
D. dynamic filter is handled, envelope detected is handled and multi-focal point mosaic is handled to carrying out through the synthetic echo-signal of handling of described wave beam, to obtain complete echo-signal of each scanning line or data;
It is characterized in that:
Among the described step B, when system receives ultrasonic echo after each emission, be according to different emission focuses, and adopt the different pulse repetition periods to receive.
2. penetrate the method that improves the image frame per second in the focal point mosaic according to the described pilosity of claim 1, it is characterized in that:
The described pulse repetition period changes with the distance between described emission focus and the ultrasonic transducer; Distance is more little then should the pulse repetition period short more.
3. penetrate the method that improves the image frame per second in the focal point mosaic according to the described pilosity of claim 1, it is characterized in that:
Echo-signal described in the step D is handled through multi-focal point mosaic earlier, handles through dynamic filter processing and envelope detected successively again.
4. penetrate the method that improves the image frame per second in the focal point mosaic according to the described pilosity of claim 1, it is characterized in that:
Echo-signal described in the step D is handled through dynamic filter earlier, handles through multi-focal point mosaic processing and envelope detected successively again.
5. penetrate the method that improves the image frame per second in the focal point mosaic according to the described pilosity of claim 1, it is characterized in that:
Echo-signal described in the step D handles through dynamic filter processing, envelope detected successively and multi-focal point mosaic is handled.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101427927B (en) * | 2007-11-09 | 2011-06-22 | 深圳迈瑞生物医疗电子股份有限公司 | Implementing method for multi-focal point mosaic in ultrasonic imaging system |
| CN102793564A (en) * | 2012-07-30 | 2012-11-28 | 飞依诺科技(苏州)有限公司 | Parameter automatic optimization method of multi-angle M model for ultrasonic imaging |
| CN108042158A (en) * | 2017-12-22 | 2018-05-18 | 飞依诺科技(苏州)有限公司 | Multifocal ultrasonoscopy joining method and its system |
| CN110930465A (en) * | 2019-11-29 | 2020-03-27 | 京东方科技集团股份有限公司 | Ultrasonic imaging method and equipment |
| WO2021120062A1 (en) * | 2019-12-18 | 2021-06-24 | 深圳迈瑞生物医疗电子股份有限公司 | Ultrasonic imaging method and ultrasonic imaging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62133945A (en) * | 1985-12-06 | 1987-06-17 | 株式会社東芝 | Ultrasonic diagnostic apparatus |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101427927B (en) * | 2007-11-09 | 2011-06-22 | 深圳迈瑞生物医疗电子股份有限公司 | Implementing method for multi-focal point mosaic in ultrasonic imaging system |
| CN102793564A (en) * | 2012-07-30 | 2012-11-28 | 飞依诺科技(苏州)有限公司 | Parameter automatic optimization method of multi-angle M model for ultrasonic imaging |
| CN102793564B (en) * | 2012-07-30 | 2015-06-10 | 飞依诺科技(苏州)有限公司 | Parameter automatic optimization method of multi-angle M model for ultrasonic imaging |
| CN108042158A (en) * | 2017-12-22 | 2018-05-18 | 飞依诺科技(苏州)有限公司 | Multifocal ultrasonoscopy joining method and its system |
| WO2019119697A1 (en) * | 2017-12-22 | 2019-06-27 | 飞依诺科技(苏州)有限公司 | Multi-focus ultrasonic image stitching method and system therefor |
| CN110930465A (en) * | 2019-11-29 | 2020-03-27 | 京东方科技集团股份有限公司 | Ultrasonic imaging method and equipment |
| WO2021120062A1 (en) * | 2019-12-18 | 2021-06-24 | 深圳迈瑞生物医疗电子股份有限公司 | Ultrasonic imaging method and ultrasonic imaging system |
| CN114340505A (en) * | 2019-12-18 | 2022-04-12 | 深圳迈瑞生物医疗电子股份有限公司 | Ultrasonic imaging method and ultrasonic imaging system |
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| CN100518659C (en) | 2009-07-29 |
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Application publication date: 20070221 Assignee: Shenzhen Mindray Animal Medical Technology Co.,Ltd. Assignor: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. Contract record no.: X2022440020009 Denomination of invention: Method for splicing echo signals of multiple emission focal points Granted publication date: 20090729 License type: Common License Record date: 20220804 |
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