WO2005037104A1 - 超音波ドプラ血流測定装置 - Google Patents
超音波ドプラ血流測定装置 Download PDFInfo
- Publication number
- WO2005037104A1 WO2005037104A1 PCT/JP2004/015289 JP2004015289W WO2005037104A1 WO 2005037104 A1 WO2005037104 A1 WO 2005037104A1 JP 2004015289 W JP2004015289 W JP 2004015289W WO 2005037104 A1 WO2005037104 A1 WO 2005037104A1
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- Prior art keywords
- blood flow
- data
- filter
- flow velocity
- interest
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/06—Measuring blood flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8979—Combined Doppler and pulse-echo imaging systems
- G01S15/8981—Discriminating between fixed and moving objects or between objects moving at different speeds, e.g. wall clutter filter
Definitions
- the present invention relates to an ultrasonic Doppler blood flow measurement device that measures blood flow in a living body using the Doppler phenomenon of ultrasonic waves and displays an image of the measurement result in the medical field
- the present invention relates to an ultrasonic Doppler blood flow measuring device for displaying an image related to blood flow velocity data in which aliasing occurs (color aliasing).
- FIG. 5 is a block diagram showing an example of a configuration of an ultrasonic Doppler blood flow measuring device according to a conventional technique.
- the ultrasonic Doppler blood flow measurement device has a probe 2 for transmitting and receiving ultrasonic waves to and from a living body. Via the probe 2, the blood flowing in the living body is irradiated with ultrasonic noise from the transmitting unit 1, and the probe 2 receives the echo of the ultrasonic pulse reflected by the blood again.
- the echo of the ultrasonic pulse is converted into an electric signal by the probe 2 and supplied to the receiving unit 3, digitized and beamformed by the receiving unit 3, phase-detected by the phase detecting unit 4, and subjected to Doppler polarization due to blood flow. It becomes a Doppler shift signal including information on the shift.
- the Doppler shift signal is supplied from the phase detection unit 4 to the wall filter 5, and the wall filter 5 removes unnecessary body tissue force signals, which are low-frequency signal components.
- the blood flow information including blood flow velocity data, blood flow echo intensity data, blood flow velocity dispersion data, and the like is calculated in the velocity calculation unit 6.
- the blood flow information is subjected to a smoothing process by a filter 7 and supplied to a digital scan converter (DSC: Digital Scan Converter) 8, where the DSC 8 performs coordinate conversion into a shape corresponding to the ultrasonic scanning.
- DSC Digital Scan Converter
- the envelope detection unit 9 sends a signal relating to the B-mode image (ultrasound tomographic image) to the DSC8.
- Signal (B-mode signal) is supplied in the same manner.
- the DSC 8 converts the supplied image data into a coordinate according to the ultrasonic scanning, mixes the B-mode signal with the blood flow information, and monitors the image data. A two-dimensional blood flow image is projected on 10.
- the blood flow velocity data included in the blood flow information is data having a possibility that a turning phenomenon based on the Nyquist theorem may occur.
- the filter processing in the filter 7 after the return is determined and corrected, the filter is processed at an arbitrary order. A method for performing a filtering process is disclosed.
- Patent Document 1 JP-A-4-161146 (FIGS. 1 and 2)
- Patent Document 1 the method of filtering blood flow velocity data disclosed in Patent Document 1 has a complicated return determination method and return correction method, and in order to realize this filter processing method, complicated hardware is required. There is a problem that a hardware configuration is required.
- the present invention realizes filtering of blood flow velocity data with wrapping by a small-scale and simple algorithm so that the blood flow velocity smoothly changes spatially or temporally. It is an object of the present invention to provide an ultrasonic Doppler blood flow measurement device that performs such image display.
- an ultrasonic Doppler blood flow measuring device of the present invention calculates a blood flow velocity value of blood in the subject from an echo signal of an ultrasonic pulse transmitted into the subject.
- An ultrasonic Doppler blood flow measuring device having a blood flow velocity filter means for performing a filtering process for outputting blood flow,
- the blood flow velocity filter means The blood flow velocity filter means,
- Filter means for performing filter processing on the difference value
- the point-of-interest blood flow velocity value is added to the filter processing result by the filter means. And an addition processing means.
- the difference calculation means may include a continuous point blood flow velocity value of a point spatially continuous with the arbitrary point of interest, and the arbitrary point of blood flow. It is configured to calculate a difference value from the flow velocity value.
- the difference calculation means may include a time-continuous blood flow velocity value at the arbitrary point of interest and a blood flow velocity value at the arbitrary point of interest. Is calculated.
- the ultrasonic Doppler blood flow measuring device of the present invention performs a filtering process for calculating a blood flow velocity value of the blood in the test subject by the echo signal force of the ultrasonic pulse transmitted into the test subject.
- An ultrasonic Doppler blood flow measurement device having a blood flow velocity filter means for performing a blood flow velocity filter means, wherein the blood flow velocity filter means determines a point of interest of an arbitrary point of interest from a blood flow velocity value supplied to the blood flow velocity filter means.
- a difference calculating means for subtracting the blood flow velocity value and calculating the difference value, a filter means for performing a filter process on the difference value, and a filter processing result by the filter means, And an addition processing means for adding the blood flow velocity value.
- FIG. 1 is a block diagram showing a configuration of an ultrasonic Doppler blood flow measuring device according to a first embodiment of the present invention.
- FIG. 2 is a block diagram showing a detailed configuration of a spatial filter of the ultrasonic Doppler blood flow measuring device according to the first embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration of an ultrasonic Doppler blood flow measuring device according to a second embodiment of the present invention.
- FIG. 4 is a block diagram showing a detailed configuration of a frame filter of the ultrasonic Doppler blood flow measuring device according to the second embodiment of the present invention.
- FIG. 5 is a block diagram showing an example of a configuration of an ultrasonic Doppler blood flow measuring device according to a conventional technique.
- FIG. 1 is a block diagram showing the configuration of the ultrasonic Doppler blood flow measuring device according to the first embodiment of the present invention.
- the ultrasonic Doppler blood flow measurement device shown in Fig. 1 has a transmitter 1, a probe 2, a receiver 3, a phase detector 4, an all-filter 5, a speed calculator 6, a digital scan converter (DSC). 8, an envelope detector 9, and a monitor 10.
- the ultrasonic Doppler blood flow measuring device shown in FIG. 1 is provided with a spatial filter 20 instead of the force filter 7 having substantially the same configuration as the ultrasonic Doppler blood flow measuring device shown in FIG.
- the components other than the spatial filter 20 are the same as those of the conventional ultrasonic Doppler blood flow measurement device shown in FIG. The description of the operation is omitted by citing the reference numerals.
- FIG. 2 is a block diagram showing a detailed configuration of a spatial filter of the ultrasonic Doppler blood flow measuring device according to the first embodiment of the present invention.
- the spatial filter 20 shown in Fig. 2 has latches 21, 22, 23 that can hold data, calo calculators 24, 25, 28, 29 that can add or subtract two data, and multiplication of two data.
- Power ⁇ Has multipliers 26 and 27! Na
- the adders 24 and 25 constitute a pre-processing unit (difference calculating unit) 41
- the multipliers 26 and 27 and the adder 28 constitute a filter unit 42
- the adder 29 constitutes a post-processing unit (addition processing unit) 43. I have.
- Latches 21, 22, and 23 are arranged to hold data (blood flow velocity values) relating to a plurality of points of interest that are spatially continuous in the direction of the ultrasonic sound ray! Puru.
- the input signal (blood flow velocity value) D31 related to the blood flow information from the velocity calculator 6 is supplied to the latch 21.
- This input signal D31 includes data relating to an arbitrary point of interest, that is, at the time of measurement, an input signal relating to a point of interest that is spatially continuous in the sound ray direction of the ultrasonic wave (continuous point blood flow velocity value) D31 is continuously supplied, and the input signal D31 from the speed calculator 6 is continuously supplied to the latch 21.
- the latch 21 holds the input signal D31 and latches the held data (for example, data relating to the immediately preceding point of interest) D32. 22 and an adder 24.
- the latch 22 When the data D32 supplied from the latch 21 is supplied, the latch 22 also retains the data D32 and supplies the retained data D33 to the latch 23 and the adders 24, 25, and 29. I do. Furthermore, when the data D33 supplied from the latch 22 is also supplied, the latch 23 holds the data D33 and supplies the held data D34 to the adder 25. As a result, the data D32, D33, and D34 relating to the spatially continuous focus points are output from the latches 21, 22, and 23 to the preprocessing unit 41 at the same timing.
- the output of the latch 21 is connected to the input of the calo calculator 24 on the addition side, and the output of the latch 22 is connected to the adder.
- the outputs of the latch 23 are connected to the inputs of the adder 25 on the subtraction side, respectively.
- the adder 24 receives the data D32 on the addition side and receives the data D33 from the subtraction side to perform an operation, and outputs the result of subtracting the data D33 from the data D32 to the multiplier 26 as data D35.
- the adder 25 performs an operation by receiving the data D34 from the addition side and the data D33 from the subtraction side, and outputs the result obtained by subtracting the data D33 from the data D34 to the multiplier 27 as data D36. .
- Multipliers 26 and 27 perform filtering coefficients set for the supplied data, respectively. Are multiplied and output. Therefore, the multiplier 26 multiplies the data D35 supplied from the adder 24 by the filter coefficient kl and outputs data D37, and the multiplier 27 outputs the data D36 supplied from the adder 25. , And multiply by the filter coefficient k3 to output data D38.
- the calo calculator 28 receives the data D37 and D38 from the multipliers 26 and 27, adds these data, and outputs the addition result to the adder 29 as data D39. And power! The calculator 29 receives the data D33 from the latch 22 and the data D39 from the adder 28, adds these data, and outputs the addition result to the DSC 8 as data D40.
- Spatial filter 20 in the present embodiment is a one-dimensional filter, and is a second-order filter (a filter having two filter coefficients). That is, in the present embodiment, the point of interest is set to the data (target sample data or target point blood flow velocity value) D33 output from the latch 22, and the pre-processing unit 41 including the adders 24 and 25 performs the target point.
- the point-of-interest sample data D33 is subtracted by the continuous point blood flow velocity values (data D32, D34) that are successively before and after the point of interest, and the data D35, Generate D36.
- the combination of the pre-processing unit 41, the filter unit 42, and the post-processing unit 43 operates as a secondary FIR (Finite duration Impulse-Response) finalizer.
- FIR Finite duration Impulse-Response
- FIG. 2 can be regarded as a second-order FIR filter having the following transfer function H (z). [0025] [Equation 2]
- z ′′ (— n) is an operator indicating an n-stage delay element.
- This FIR filter has a low-pass filter characteristic to remove random noise having high frequency components.
- all coefficients are positive numbers for a second-order FIR filter.
- the adders 24 and 25 perform, for example, fixed-point arithmetic, and the data format of the output is the same as the data format of the input data, and the carry bit of the addition result is discarded (ignored). For example, if the input is in 8-bit two's complement format, the output is also in 8-bit two's complement format.
- the data D35 is calculated as a difference value between the data D32 and the sample data of interest D33 under the condition that the speed difference between the data is smaller than the speed difference at which folding occurs.
- the data D36 is calculated as a difference value between the data D34 and the sample data of interest D33 under the condition that the speed difference between the data is smaller than the speed difference at which the turning back occurs.
- one of the continuous point blood flow velocity values (three data D32, D33, and D34) supplied to the secondary FIR filter is converted into one sample data of interest (for example, data (D33), filter calculation is performed assuming that the speed difference between the blood flow speed value related to the sample data of interest and the blood flow speed value related to the other data is smaller than the speed difference that causes aliasing. Becomes possible. Therefore, at the same time (within the same image), after filtering the difference value for an arbitrary central pixel, the data relating to the arbitrary central pixel is added again to obtain data relating to a desired blood flow velocity value. It is possible to reduce spatial random noise. Note that the first Although the embodiment is an example of realizing a one-dimensional second-order filter, it is also possible to similarly extend a one-dimensional and two-dimensional filter to a higher-order filter.
- the spatial filter 20 includes a pre-processing unit 41 for performing a filtering process, a filtering unit 42 for performing a filtering process, and a post-processing unit 43 for adding the sample data D33 of interest to the output data D39 after the filtering process by the filtering unit 42.
- This makes it possible to filter spatially continuous blood flow velocity data (continuous point blood flow velocity values) in the sound ray direction of ultrasonic waves without being affected by aliasing, and to achieve spatial smoothness. It is possible to provide a simple blood flow velocity image.
- FIG. 3 is a block diagram showing a configuration of an ultrasonic Doppler blood flow measuring device according to the second embodiment of the present invention.
- the ultrasonic Doppler blood flow measuring device according to the second embodiment of the present invention shown in FIG. 3 replaces the spatial filter 20 of the ultrasonic Doppler blood flow measuring device according to the first embodiment of the present invention, The difference is that a frame filter 50 is provided.
- the components other than the frame filter 50 are the same as those of the conventional ultrasonic Doppler blood flow measuring device shown in FIGS. And the description of the operation is omitted.
- FIG. 4 is a block diagram showing a detailed configuration of a frame filter of the ultrasonic Doppler blood flow measuring device according to the second embodiment of the present invention.
- the frame filter 50 shown in FIG. 4 differs from the spatial filter 20 shown in FIG. 2 in that frame memories 52 and 53 are provided instead of the latches 22 and 23.
- the components other than the frame memories 52 and 53 are the same as the components of the spatial filter 20 shown in FIG. Is omitted.
- the input signal D61 related to the blood flow information from the speed calculator 6 is supplied to the latch 21.
- This input signal D61 includes data relating to an arbitrary point of interest, that is, At the time of measurement, an input signal (blood flow velocity value) D61 related to a point of interest that is continuous in the sound ray direction of the ultrasonic wave is continuously supplied, and the input signal D61 from the velocity calculation unit 6 is continuously supplied to the latch 21. Supplied.
- the latch 21 holds the input signal D61 and stores the held data (for example, data related to the immediately preceding point of interest) D62 in the frame memory. 52 and adder 24.
- the input signal D61 related to the blood flow information from the speed calculator 6 is supplied to the latch 21 and further supplied to the frame memory 52 as data D62.
- the frame memory 52 holds the data D62 supplied from the latch 21 and outputs the data D63 one frame before in the same part.
- the frame memory 53 holds the data D63 output from the frame memory 52 and outputs the data D64 one frame earlier (two frames earlier than the data D62) in the same part. This allows latch 21, frame memory 5
- D64 (that is, a temporally continuous blood flow velocity value at an arbitrary point of interest) is output to the preprocessing unit 41 at the same timing.
- the data D63 is used as sample data of interest (point-of-interest blood flow velocity value), and the pre-processing unit 41, the filter unit 42, and the post-processing unit 43 use the same data as in the first embodiment. Processing is performed.
- one of the three data D62, D63, and D64 supplied to the second-order FIR filter is regarded as sample data of interest (for example, data D63), and is associated with the sample data of interest. It is possible to perform a filter operation on the assumption that the speed difference between the blood flow speed value and the blood flow speed values related to the other data is smaller than the speed difference at which aliasing occurs. Therefore, after filtering the difference value between the data relating to the blood flow velocity value at an arbitrary time and the data relating to the blood flow velocity values that are temporally adjacent to each other at the same part, the blood flow velocity value at the predetermined time is again determined. It is possible to acquire data relating to a desired blood flow velocity value by adding data relating to values, and it is possible to reduce temporal random noise between a plurality of temporally consecutive images.
- the ultrasonic Doppler blood flow measuring device in the second embodiment of the present invention subtraction based on the sample data of interest D63 is performed on all supplied data.
- the frame filter 50 having the post-processing unit 43 for adding the sample data of interest D63 to the output data after the filter processing the time of the same portion in the sound ray direction of the ultrasonic wave can be obtained without being affected by aliasing. It is possible to perform filtering processing on blood flow velocity data that is continuous in time (a temporally continuous blood flow velocity value at an arbitrary point of interest), and it is possible to provide a blood flow velocity image that changes smoothly in time. It becomes possible.
- the extension to a higher-order frame filter than in the example of realizing the second-order frame filter can be similarly performed.
- the frame filter 50 may be installed between the monitor DSC 10 and the force DSC 8 provided between the force speed calculation unit 6 and the DSC 8. .
- the ultrasonic Doppler blood flow measurement device having the spatial filter 20 is independently provided, and in the second embodiment, the ultrasonic Doppler blood flow measurement device having the frame filter 50 is provided independently.
- both the spatial filter 20 and the frame filter 50 can be provided in the ultrasonic Doppler blood flow measuring device.
- the spatial filter 20 and the frame filter 50 can be realized by software constituted by hardware. Industrial applicability
- the ultrasonic Doppler blood flow measuring device realizes filtering of blood flow velocity data with aliasing by a small-scale and simple algorithm, so that the blood flow smoothly changes spatially or temporally.
- the present invention is particularly applicable to a technique for color-displaying an image related to blood flow velocity data in which a folding phenomenon occurs.
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Abstract
Description
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/572,428 US7946991B2 (en) | 2003-10-17 | 2004-10-15 | Ultrasonic doppler blood flow measuring device |
| JP2005514806A JP4562656B2 (ja) | 2003-10-17 | 2004-10-15 | 超音波ドプラ血流測定装置 |
| EP04792506A EP1683486B1 (en) | 2003-10-17 | 2004-10-15 | Ultrasonic doppler blood flow measuring device |
| DE602004022697T DE602004022697D1 (de) | 2003-10-17 | 2004-10-15 | Ultraschall-doppler-blutflussmessgerät |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-358059 | 2003-10-17 | ||
| JP2003358059 | 2003-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005037104A1 true WO2005037104A1 (ja) | 2005-04-28 |
Family
ID=34463277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/015289 Ceased WO2005037104A1 (ja) | 2003-10-17 | 2004-10-15 | 超音波ドプラ血流測定装置 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7946991B2 (ja) |
| EP (1) | EP1683486B1 (ja) |
| JP (1) | JP4562656B2 (ja) |
| CN (1) | CN100443056C (ja) |
| DE (1) | DE602004022697D1 (ja) |
| WO (1) | WO2005037104A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013153988A (ja) * | 2012-01-30 | 2013-08-15 | Toshiba Corp | 超音波診断装置及び超音波診断装置の制御プログラム |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100469320C (zh) * | 2005-09-29 | 2009-03-18 | 深圳迈瑞生物医疗电子股份有限公司 | 消除彩色血流图像中速度异常点的方法 |
| RU2311870C2 (ru) * | 2005-10-28 | 2007-12-10 | ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ "Афалина" | Способ регистрации кровотока |
| CN101190132B (zh) * | 2006-11-28 | 2010-12-08 | 深圳迈瑞生物医疗电子股份有限公司 | 超声成像的预处理方法与装置 |
| CN101313856B (zh) * | 2007-06-01 | 2012-07-18 | 深圳迈瑞生物医疗电子股份有限公司 | 彩色血流帧相关的方法和装置 |
| CN101467895B (zh) * | 2007-12-29 | 2013-03-27 | 深圳迈瑞生物医疗电子股份有限公司 | 连续多普勒超声系统中聚焦计算的实现方法与设备 |
| JP2011087710A (ja) * | 2009-10-21 | 2011-05-06 | Toshiba Corp | 超音波診断装置 |
| CN102113900B (zh) * | 2010-01-05 | 2015-07-15 | 深圳迈瑞生物医疗电子股份有限公司 | 彩色血流动态帧相关方法和装置 |
| CN103876780B (zh) * | 2014-03-03 | 2015-07-15 | 天津迈达医学科技股份有限公司 | 高频超声血流灰阶成像方法及装置 |
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- 2004-10-15 DE DE602004022697T patent/DE602004022697D1/de not_active Expired - Lifetime
- 2004-10-15 CN CNB2004800305358A patent/CN100443056C/zh not_active Expired - Fee Related
- 2004-10-15 US US10/572,428 patent/US7946991B2/en not_active Expired - Fee Related
- 2004-10-15 EP EP04792506A patent/EP1683486B1/en not_active Expired - Lifetime
- 2004-10-15 WO PCT/JP2004/015289 patent/WO2005037104A1/ja not_active Ceased
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1683486A1 (en) | 2006-07-26 |
| EP1683486B1 (en) | 2009-08-19 |
| DE602004022697D1 (de) | 2009-10-01 |
| EP1683486A4 (en) | 2008-04-16 |
| US7946991B2 (en) | 2011-05-24 |
| CN1867295A (zh) | 2006-11-22 |
| US20070161900A1 (en) | 2007-07-12 |
| JP4562656B2 (ja) | 2010-10-13 |
| JPWO2005037104A1 (ja) | 2007-11-22 |
| CN100443056C (zh) | 2008-12-17 |
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