CN101697927B - Self-adaption dynamic filter - Google Patents
Self-adaption dynamic filter Download PDFInfo
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- CN101697927B CN101697927B CN2009102050818A CN200910205081A CN101697927B CN 101697927 B CN101697927 B CN 101697927B CN 2009102050818 A CN2009102050818 A CN 2009102050818A CN 200910205081 A CN200910205081 A CN 200910205081A CN 101697927 B CN101697927 B CN 101697927B
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- 238000006243 chemical reaction Methods 0.000 claims description 18
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- 238000000034 method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000003384 imaging method Methods 0.000 description 12
- 238000001914 filtration Methods 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 2
- 230000006854 communication Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Abstract
The invention discloses a self-adaption dynamic filter relating to the medical technology field of medicinal use, in particular to the technical field of ultrasonic wave echo. The self-adaption dynamic filter is composed of a group of echo data buffer modules, a group of 256-point FFT converter modules, a group of central frequency numbering generation modules and a group of FIR filter modules, wherein the central frequency number generation module has the function of finding the frequency number corresponding to the corresponding highest frequency in all values bigger than a threshold value in a frequency domain. In a far field, because the dynamic filter designed with the method of the invention can better match with the center frequency of the echo, the dynamic filter can obtain the maximal signal-to-noise ratio after a signal passes through an automatically matched dynamic filter and can improve image resolution ratio and sensitivity.
Description
Technical field
The present invention relates to medical field of medical technology, particularly the ultrasonic echo technical field.
Background technology
Ultrasonic in the communication process of tissue, energy is decayed with the increase of the degree of depth, and the rate of decay is directly proportional with ultransonic frequency.When a branch of when the ultrasound wave incident in certain broadband is arranged, because the rate of decay difference of each frequency has caused the mid frequency of this Shu Shengbo to change with the variation of the degree of depth.The degree of depth is dark more, and mid frequency is low more.In the digital imaging system imaging device in modern times, often utilize kinetic filter to come echo-signal is carried out matching treatment.Under the different depth, the mid frequency of kinetic filter can change, thereby the information component of extracting different frequency in echo-signal is used for imaging.The main standard of weighing ultrasonograph quality is the resolution and the sensitivity of image.
Resolution is except that outside the Pass having with factors such as focusing on the change mark, and the frequency height of the ultrasonic beam of used imaging also is an important factors.Frequency is high more, and then wavelength is short more, and longitudinal resolution is good more, and the high more main lobe secondary lobe of wave beam that also can make of frequency is bigger than more simultaneously, can improve lateral resolution.So, need use the high fdrequency component in the ultrasonic beam to carry out imaging as far as possible in order to improve the resolution of image.This just requires the mid frequency of kinetic filter high more good more.
Sensitivity then has much relations with the mid frequency of echo-signal.Have only and use the frequency component of energy maximum in the echo-signal partly to carry out imaging, can make sensitivity reach maximum.This just requires the mid frequency of used kinetic filter consistent with the mid frequency of echo-signal.Echo-signal is carried out matched filtering, to obtain having maximum signal to noise ratio.
For the oeverall quality that makes ultrasonoscopy improves as much as possible, the design of kinetic filter has two principles, and 1, can utilize the high fdrequency component in the echo in the near field, can effectively improve detection accuracy; 2, in the far field, because the high fdrequency component decay is very severe, its intensity can not satisfy the requirement of imaging usually, then need utilize the less low-frequency component of relative attenuation in the echo.So just both guarantee the quality of near-field pattern picture, taken into account the sensitivity of far field image again.And by matching idea as can be known, when the frequency spectrum of the spectral characteristic of wave filter and signal coincides, can obtain maximum signal to noise ratio.Can effectively improve the sensitivity of ultra sonic imaging like this.But in the design of traditional supersonic imaging apparatus, the variation function of kinetic filter mid frequency often is linear empirical equation.Can not well mate the mid frequency of echo-signal, this has also caused the reduction of ultra sonic imaging sensitivity.
Summary of the invention
Order of the present invention is to design a kind of resolution of the image that improves, particularly far field image and the self-adaption dynamic filter of sensitivity.
The present invention is made up of one group of echo data buffer module, one group of 256 FFT conversion module, one group of mid frequency numbering generation module and one group of FIR filter module with the function of numbering greater than the pairing frequency of highest frequency corresponding in all values of threshold value in the frequency domain found out; Described echo data buffer module has respectively by two every section echo-signal is received and the echo-signal of taking turns to be received is sent to the memorizer R of the function of 256 FFT conversion modules in turn
1, R
2Form described memorizer R
1Signal output part be connected described memorizer R with the echo-signal input of described FIR filter module and the time-domain signal input of described 256 FFT conversion modules respectively
2Signal output part be connected with the echo-signal input of described FIR filter module and the time-domain signal input of described 256 FFT conversion modules respectively, the frequency domain signal outfan of described 256 FFT conversion modules is connected with the signal input part of mid frequency numbering generation module, another input of described mid frequency numbering generation module also is connected with the threshold signal outfan, the frequency numbering outfan of described mid frequency numbering generation module is connected with the input of described FIR filter module, and described FIR filter module is provided with the dynamic filter outfan.
Two memorizer R in the echo data buffer module of the present invention
1, R
2Every section echo-signal is received and the echo-signal of taking turns to be received is sent to 256 FFT conversion modules in turn, 256 FFT conversion modules are transformed into frequency domain to the time domain of the echo-signal of input and are sent to mid frequency numbering generation module, mid frequency numbering generation module has the function of numbering greater than the pairing frequency of highest frequency corresponding in all values of threshold value in the frequency domain found out, mid frequency numbering generation module has the function that this frequency numbering is sent the FIR filter module, the FIR filter module is numbered according to frequency, load the kinetic filter coefficient, echo-signal is carried out matched filtering.
The present invention utilizes the FFT conversion, the frequency characteristic of the true echo of each segment of real-time analysis, frequency characteristic according to true echo is selected different kinetic filter coefficients, in the near field, owing to adopted higher frequency component to carry out imaging, make image resolution ratio better, in the far field, owing to can be good at mating the mid frequency of echo with the kinetic filter of the inventive method design, so obtain maximum signal to noise ratio, the resolution and the sensitivity that can improve image simultaneously after can making signal through the kinetic filter that mates automatically.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
The ultrasonography that Fig. 2 obtains for the present invention.
The ultrasonography that Fig. 3 obtains for prior art.
The specific embodiment
As shown in Figure 1, form by one group of echo data buffer module, one group of 256 FFT conversion module, one group of mid frequency numbering generation module and one group of FIR filter module with the function of numbering greater than the pairing frequency of highest frequency corresponding in all values of threshold value in the frequency domain found out.
The echo data buffer module has respectively by two every section echo-signal is received and the echo-signal of taking turns to be received is sent to the memorizer R of the function of 256 FFT conversion modules in turn
1, R
2Form two memorizer R
1, R
2Signal output part be connected with the time-domain signal input of FIR filter module echo-signal input, 256 FFT conversion modules respectively.
The frequency domain signal outfan of 256 FFT conversion modules is connected with the signal input part of mid frequency numbering generation module, another input of mid frequency numbering generation module also is connected with the threshold signal outfan, the frequency numbering outfan of mid frequency numbering generation module is connected with the input of FIR filter module, and the FIR filter module is provided with the dynamic filter outfan.
Operation principle:
1, the echo data buffer module is respectively 256 bytes of memory device R by two sizes
1, R
2Constituting, is that unit carries out segmentation with echo-signal with per 256, is designated as X from the near field to the far field successively
1, X
2... ..X
N-1, X
NTwo memorizer R
1, R
2Every section echo is received in turn: R
1Receive X
1After finishing, R
1Data are sent FFT module, simultaneously R
2Begin to receive X
2R
2Receive X
2After finishing, R
2Data are sent FFT module, simultaneously R
1Begin to receive X
3..., receive in turn by this rule.
2,256 Xs of FFT conversion module to importing
nThe FFT that carries out at 256 calculates, and obtains Y as a result
n, and with Y
nSend frequency numbering generation module.
3, find out Y at mid frequency numbering generation module
nIn greater than highest frequency corresponding in all values of threshold value, this frequency promptly is the mid frequency of the best of the used wave filter of this section echo, and obtains corresponding frequency numbering, send FIR filter module with the frequency numbering.
4, according to the frequency numbering of mid frequency numbering generation module input, load the kinetic filter coefficient.To X
nCarry out matched filtering.
Interpretation of result:
Use the kinetic filter of automatic coupling of the present invention, the kinetic filter with adopting traditional method obtains Fig. 2,3 respectively.
Comparison diagram 2,3, can see, the image (Fig. 2) that employing the method for the invention obtains is in the near field, owing to adopted higher frequency component to carry out imaging, make image resolution ratio better, in the far field, owing to can be good at mating the mid frequency of echo with the kinetic filter of the method for the invention design, so obtain maximum signal to noise ratio after can making signal through the kinetic filter that mates automatically, image sensitivity is also higher.
Conclusion: adopt the kinetic filter of the method for the invention design, can well mate the mid frequency of echo-signal, thereby obtain maximum signal to noise ratio, improve the sensitivity of image in the far field.
Claims (1)
1. a self-adaption dynamic filter is characterized in that being made up of one group of echo data buffer module, one group of 256 FFT conversion module, one group of mid frequency numbering generation module and one group of FIR filter module with the function of numbering greater than the pairing frequency of highest frequency corresponding in all values of threshold value in the frequency domain found out; Described echo data buffer module has respectively by two every section echo-signal is received and the echo-signal of taking turns to be received is sent to the memorizer R of the function of 256 FFT conversion modules in turn
1, R
2Form described memorizer R
1Signal output part be connected described memorizer R with the echo-signal input of described FIR filter module and the time-domain signal input of described 256 FFT conversion modules respectively
2Signal output part be connected with the echo-signal input of described FIR filter module and the time-domain signal input of described 256 FFT conversion modules respectively, the frequency domain signal outfan of described 256 FFT conversion modules is connected with the signal input part of mid frequency numbering generation module, another input of described mid frequency numbering generation module also is connected with the threshold signal outfan, the frequency numbering outfan of described mid frequency numbering generation module is connected with the input of described FIR filter module, and described FIR filter module is provided with the dynamic filter outfan.
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| CN2009102050818A CN101697927B (en) | 2009-10-22 | 2009-10-22 | Self-adaption dynamic filter |
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| CN2009102050818A CN101697927B (en) | 2009-10-22 | 2009-10-22 | Self-adaption dynamic filter |
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| CN101697927B true CN101697927B (en) | 2011-04-13 |
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| CN106021181B (en) * | 2016-05-17 | 2019-06-25 | 中国电子科技集团公司第四十一研究所 | The consecutive points correlation mean value noise-reduction method that a kind of pair of FFT data is implemented |
| CN107789008B (en) * | 2017-11-29 | 2021-03-19 | 声泰特（成都）科技有限公司 | Self-adaptive ultrasonic beam synthesis method and system based on channel data |
| CN115318605B (en) * | 2022-07-22 | 2023-09-08 | 东北大学 | Automatic matching method for variable-frequency ultrasonic transducer |
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Effective date of registration: 20160303 Address after: 200030 room 1, building 333, No. 492, Hongqiao Road, Shanghai, Xuhui District Patentee after: ZHONGHUI MEDICAL TECHNOLOGY (SHANGHAI) Co.,Ltd. Address before: 225200, Jianghuai Road, Jiangdu, Jiangsu, No. 188 Patentee before: JIANGSU SINOWAYS(ZHONGHUI) MEDICAL TECHNOLOGY Co.,Ltd. |
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Denomination of invention: An adaptive dynamic filter Effective date of registration: 20220308 Granted publication date: 20110413 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Xuhui sub branch Pledgor: ZHONGHUI MEDICAL TECHNOLOGY (SHANGHAI) Co.,Ltd. Registration number: Y2022310000046 |
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Date of cancellation: 20230315 Granted publication date: 20110413 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Xuhui sub branch Pledgor: ZHONGHUI MEDICAL TECHNOLOGY (SHANGHAI) Co.,Ltd. Registration number: Y2022310000046 |
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Denomination of invention: An Adaptive Dynamic Filter Effective date of registration: 20230830 Granted publication date: 20110413 Pledgee: Bank of Beijing Limited by Share Ltd. Shanghai branch Pledgor: ZHONGHUI MEDICAL TECHNOLOGY (SHANGHAI) Co.,Ltd. Registration number: Y2023980054625 |