CN107817297A - A kind of ultrasonic imaging processing method and processing system based on ultrasonic echo RF data - Google Patents
A kind of ultrasonic imaging processing method and processing system based on ultrasonic echo RF data Download PDFInfo
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- CN107817297A CN107817297A CN201711180434.4A CN201711180434A CN107817297A CN 107817297 A CN107817297 A CN 107817297A CN 201711180434 A CN201711180434 A CN 201711180434A CN 107817297 A CN107817297 A CN 107817297A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4463—Signal correction, e.g. distance amplitude correction [DAC], distance gain size [DGS], noise filtering
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Abstract
The present invention provides a kind of ultrasonic imaging processing method and processing system based on ultrasonic echo RF data, and shown method includes：S1, ultrasound detection signal launched to target detection thing by ultrasonic probe, and receive ultrasound echo signal；S2, the optimal weighting vector for calculating the ultrasound echo signal；S3, utilize the RF data in echo-signal described in described optimal weighting Vector operation；S4, echo-signal is decomposed into by several intrinsic mode functions using empirical mode decomposition algorithm；S5, the instantaneous frequency for asking for each intrinsic mode function, are modified to the intrinsic mode function containing non-targeted frequency；S6, the intrinsic mode function after adjustment is weighted synthesizes revised RF signals；S7, based on described RF data, carry out ultrasonic imaging processing and obtain test target images.This method and system can solve the problem that limits in conventional Ultrasound imaging method intermediate-resolution and contrast, improves the contrast and resolution ratio of ultrasonoscopy.
Description
Technical field
The invention belongs to ultrasonic imaging technique field, especially plants the ultrasonic imaging processing side based on ultrasonic echo RF data
Method and processing system.
Background technology
Ultrasonic imaging is a kind of convenient and efficient lossless detection technique.Ultrasonic wave in object to be detected internal communication, by
In different materials, tissue or interstructural acoustic characteristic impedance difference, ultrasonic wave is caused along the reflection on its propagation path, folding
Phenomena such as penetrating, scattering.It is imaged using the acoustic characteristic impedance different information carried in ultrasound echo signal, by echo-signal
Detection and processing must most arrive the ultrasonoscopy swept and survey object.
The conventional processing of the ultrasonic imaging based on RF data usually requires to pass through following process：Ultrasonic signal is via probe
Transducer array element converts electrical signals to acoustical signal and is transmitted into detection object；Then ultrasound is returned by the transducer array element of probe
The acoustical signal of ripple is reconverted into electric signal, by analog circuit to the signal carry out front-end filtering amplification, then by AD conversion for number
Word signal；Radiofrequency signal, i.e. RF signals further are obtained through row Wave beam forming to the data of each array element passage, passed through afterwards
Quadrature demodulation obtains I/Q two-way orthogonal signalling and is sent to imaging module below.
Main flow imaging mode in the conventional ultrasonic imaging based on RF data to the appropriate delay of each passage by being superimposed
To reach the purpose for focusing on and obtaining RF data, but the method for this Wave beam forming does not account for independently of echo data
The data characteristicses of echo data.Main lobe width is wide do not obtain with secondary lobe good suppression cause imaging system rate respectively and
Contrast deficiency；Noise signal is removed using bandpass filtering based on Fourier transform simultaneously, causes noise to go unnet and useful
The shortcomings of signal is deleted.
The content of the invention
It is an object of the invention to provide a kind of ultrasonic imaging processing method and processing system based on ultrasonic echo RF data
System.
In order to realize the foregoing invention first purpose, the ultrasonic imaging based on ultrasonic echo RF data of embodiment of the present invention
Processing method includes step：
S1, ultrasonic signal sent to target object to be detected by ultrasonic probe, and obtain the ultrasound emission signal
Echo-signal；
S2, based on undistorted criterion and compound Weibull process criterion, calculate the optimal weighting arrow of the echo-signal
Amount；
S3, the RF data for calculating the echo-signal；
S4, the RF data are decomposed into by several intrinsic mode functions using empirical mode decomposition algorithm；
S5, the instantaneous frequency for calculating the intrinsic mode function, and to the natural mode of vibration letter containing un-wanted frequency scope
Number part is modified；
S6, synthesis is weighted to revised intrinsic mode function, forms revised echo RF data；
S7, to the revised ultrasonic echo RF data, handled through row ultrasonic imaging, obtain the imaging knot of detection target
Fruit.
As the further improvement of invention embodiment, the step S2 is specifically included：
P1, each passage echo data X1 received to the ultrasonic probe carry out compensation of delay；
P2, to the echo data X1 after the compensation, do auto-correlation processing, ask for autocorrelation matrix R (x)；
P3, using Gauss-Jordan's algorithm ask for the inverse of the autocorrelation matrix R (x)；
P4, according to the inverse of the autocorrelation matrix R (x), calculate optimal weighting vector.
As the further improvement of invention embodiment, the step S4 is specifically included：
M1, the local minimum and local maximum for calculating the RF data；
M2, using linear interpolation, obtain the upper and lower envelope signal of the RF data, and calculate the equal of upper and lower envelope signal
Value；
M3, the average for linearly removing upper and lower envelope signal, this process is repeated, until getting intrinsic mode function；
M4, the intrinsic mode function acquired is subtracted from RF data, and repeat said process, until decomposing
The data arrived are monotonic function.
In order to realize one of foregoing invention target, the ultrasonic imaging processing system based on RF data of embodiment of the present invention
System, the system include：
Signal transmitting and receiving module：For sending ultrasound emission signal to target detection object by ultrasonic probe, and connect
Receive its corresponding echo-signal；
Signal transmitting and receiving control module：Sequential is sent and received for control ultrasonic probe；
Signal processing module：For calculating the optimal weighting vector of ultrasound echo signal；Ultrasonic echo is obtained for calculating
In RF signals；RF data are decomposed using empirical mode decomposition, obtain some intrinsic mode functions；It is each for calculating
The instantaneous frequency of intrinsic mode function；Each intrinsic mode function is modified respectively；For synthesizing revised RF data；
Image processing module：Handled for ultrasonic imaging, obtain detection target ultrasonoscopy.
Compared with prior art, the invention has the advantages that：
1st, the characteristic based on echo data obtains optimal weighting vector, and number of echoes is obtained using the optimal weighting vector of acquisition
RF data in, it can effectively improve the resolution ratio and picture contrast of imaging system；
2nd, empirical mode decomposition method is employed, RF data are dynamically decomposed into some intrinsic mode functions, so as to
Noise signal can be effectively filtered out, while retains useful signal, there is very high decomposition efficiency, and it is special to retain local time-frequency
Property.
Brief description of the drawings
Fig. 1 is the ultrasonic imaging process flow figure based on RF data that first embodiment provides in the present invention；
Fig. 2 is the ultrasonic imaging process flow figure based on RF data that second embodiment provides in the present invention；
Fig. 3 is the ultrasonic imaging process flow figure based on RF data that the 3rd embodiment provides in the present invention；
Fig. 4 is the module signal of the ultrasonic imaging processing system based on RF data that first embodiment provides in the present invention
Figure.
Embodiment
Below with reference to embodiment shown in the drawings, the present invention will be described in detail.But embodiment is not intended to limit
The present invention, structure that one of ordinary skill in the art is made according to these embodiments, method or conversion functionally are equal
Comprising within the scope of the present invention.
As shown in figure 1, Fig. 1 is the stream for the local RF data ultrasonic imaging processing methods that first embodiment of the invention provides
Cheng Tu.Accordingly, the described method comprises the following steps：
S1, ultrasonic signal sent to target object to be detected by ultrasonic probe, and obtain the ultrasound emission signal
Echo-signal；
S2, based on undistorted criterion and compound Weibull process criterion, calculate the optimal weighting arrow of the echo-signal
Amount；
S3, the RF data for calculating the echo-signal；
S4, the RF data are decomposed into by several intrinsic mode functions using empirical mode decomposition algorithm；
S5, the instantaneous frequency for calculating the intrinsic mode function, and to the natural mode of vibration letter containing un-wanted frequency scope
Number part is modified；
S6, synthesis is weighted to revised intrinsic mode function, forms revised echo RF data；
S7, to the revised ultrasonic echo RF data, handled through row ultrasonic imaging, obtain the imaging knot of detection target
Fruit.
Existing ultrasound is clearly distinguishable to the second speed based on RF data ultrasonic imaging processing methods, its step S2, S4 above
Imaging data treatment technology is identical, and other steps are not described in detail.Difference with the prior art of the present invention is, based on echo
The characteristic of data is decomposed to obtain RF data by dynamic data, on the basis of remaining with data message effectively
Filter out noise signal.The implementation method can provide the signal to noise ratio of the supersonic imaging apparatus using the processing method and system,
Image resolution ratio and picture contrast, make imaging arrangement more careful, it is clear and reliable.
Accordingly, " RF " in the RF data is English：Radio frequency, Chinese：The abbreviation of radiofrequency signal.
Herein below will be described in detail the embodiment of the present invention.With reference to shown in Fig. 2, embodiments of the present invention
In, the step S2 is specifically included：
P1, each passage echo data X1 received to the ultrasonic probe carry out compensation of delay；
In specific example of the present invention, the data of each passage of ultrasonic echo are expressed as x1(t), x2(t) x is arrivedn(t), its
Middle n is the array element number of ultrasonic probe, that is, number of active lanes.It can then be replaced for the compensation of delay of the passage echo data
For the phase compensation to channel data, wherein with channel data x (1) for reference channel, then each passage is modified to x2(t-
τ)...xn(t-(n-1)τ).So as to obtain the correction value of each passage echo data, and it is X1 to make it.
P2, to the echo data X1 after the compensation, do auto-correlation processing, ask for autocorrelation matrix R (x)；
Auto-correlation processing is carried out to the echo data X1, then can obtain its autocorrelation matrix is R (x)=X1H·X1.Make
Assessed for the self-characteristic of echo data.
P3, using Gauss-Jordan's algorithm ask for the inverse of the autocorrelation matrix R (x)；
To the R (x), R (n, m) can be expressed as, wherein n is number of active lanes, and m is selection data length.Then according to height
This-Jordan's method asks for R-1(x)。
P4, calculate optimal weighting vector.
For having array prevalence vector v corresponding to the ultrasound emission waveform echo data.Then it can meet to constrain bar
Part, cause that signal variance is minimum in the presence of noise, and from meet source signal with receive signal can approach it is equal.Therefore
It is w that optimal weighting vector, which can be obtained,opt=vHR1(x)/vHR-1(x)v。
With reference to shown in Fig. 3, in embodiments of the present invention, the step S4 is specifically included：
Empirical mode decomposition is according to the wherein intrinsic oscillation mode of the identification of data adaptive, is different from Fourier space
Decomposition and wavelet decomposition, it is based respectively on ideal sinusoidal or cosine function and wavelet function, and empirical mode decomposition need not appoint
What function, has very high decomposition efficiency and local time-frequency characteristic.
M1, the local minimum and local maximum for calculating the RF data；For described RF data as decomposition
Input signal, it is designated as x (t)；X (t) local maximum and local minimum is calculated, the process of asking for is not limited to specific side
Method, such as derivative method；
M2, using linear interpolation, obtain the upper and lower envelope signal of x (t) data, and calculate upper and lower envelope signal
Average；To described local extremum, using linear interpolation formation x (t) envelope signal up and down.And envelope signal is calculated
Average be designated as m (t)；
M3, the average for subtracting from x (t) upper and lower envelope signal, this process is repeated, until getting intrinsic mode function；
Judge whether that decomposition obtains intrinsic mode function in the step M3, according to the x (t) and m (t), further haveIts intrinsic mode function sieves the condition of stopping：Lead u (t)=m (t)/tmm, wherein tmmFor maximum extreme value
With the intermediate value of the time difference of minimum extreme value, if in whole time zone 1-tmmU (t) is less than empirical value lower limit in time, its
His time u (t) is less than the empirical value upper limit, then screening terminates orderFor intrinsic mode function, otherwise make
Repeat this process；
M4, the intrinsic mode function acquired is subtracted from RF data, and repeat said process, until decomposing
The data arrived are monotonic function.If above-mentioned M3 screening is set up, into step M4, and obtained natural mode is subtracted from RF data
State function, i.e. RF dataAnd said process is repeated, terminate until decomposing.
Compared with prior art, the present invention is based on RF data ultrasonic imaging processing methods and system, exists obtaining RF data
The self-characteristic of echo data has been taken into full account, has effectively improved the quality of data of RF data, while using adaptive point
Solution method eliminates to noise in RF data.The image of the supersonic imaging apparatus using the processing method and system can be improved
Quality.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications that case is made, all should fall into present invention determine that protection domain in.
Claims (8)
1. a kind of ultrasonic imaging processing method based on ultrasonic echo RF data, it is characterised in that methods described includes following step
Suddenly：
S1, ultrasonic signal sent to target object to be detected by ultrasonic probe, and obtain the echo of the ultrasound emission signal
Signal；
S2, based on undistorted criterion and compound Weibull process criterion, calculate the optimal weighting vector of the echo-signal；
S3, the RF data for calculating the echo-signal；
S4, the RF data are decomposed into by several intrinsic mode functions using empirical mode decomposition algorithm；
S5, the instantaneous frequency for calculating the intrinsic mode function, and to the intrinsic mode function portion containing un-wanted frequency scope
Divide and be modified；
S6, synthesis is weighted to revised intrinsic mode function, forms revised echo RF data；
S7, to the revised ultrasonic echo RF data, handled through row ultrasonic imaging, obtain the imaging results of detection target.
2. the ultrasonic imaging processing method according to claim 1 based on ultrasonic echo RF data, it is characterised in that described
Step S2 requirements are according to minimum undistorted criterion, it is proposed that constraints makes echo RF data Y (x) be equal to preferable echo data X
(x), then in the presence of noise so that Y (x) variance is minimum, obtains constraining E [Y (x)]=W1 (x) S (x) W2 (x) and makes
E [Y (x)] obtains minimum；For wherein S (x) to be an actually-received containing noisy echo-signal, W1 (x) and W2 (x) are respectively to weight
The conjugate transposition and weight vectors of vector.
3. the ultrasonic imaging processing method according to claim 1 based on ultrasonic echo RF data, it is characterised in that described
Step S2 requirements are according to minimum unbiased esti-mator criterion, it is proposed that constraints weight vectors W (x) and the popular arrow of array of ultrasonic battle array
The product for measuring v (x) is 1；According to described minimum unbiased esti-mator criterion so that echo data and RF data unbiased esti-mators, then need
The influence of less noise as far as possible, ensure constraints W (x) v (x)=1.
4. the ultrasonic imaging processing method according to claim 1 based on ultrasonic echo RF data, it is characterised in that described
The step of step S2, includes：
P1, each passage echo data X1 received to the ultrasonic probe carry out compensation of delay；
P2, to the echo data X1 after the compensation, do auto-correlation processing, ask for autocorrelation matrix R (x)；
P3, using Gauss-Jordan's algorithm ask for the inverse of the autocorrelation matrix R (x)；
P4, the inverse calculating optimal weighting vector W according to the autocorrelation matrix R (x)opt(x)。
5. the ultrasonic imaging processing method of ultrasonic echo RF data according to claim 1, it is characterised in that the step
The step of S4, includes：
M1, the local minimum and local maximum for calculating the RF data；
M2, using linear interpolation, obtain the upper and lower envelope signal of the RF data, and calculate the average of upper and lower envelope signal；
M3, the average for linearly removing upper and lower envelope signal, this process is repeated, until getting intrinsic mode function；
M4, the intrinsic mode function acquired is subtracted from RF data, and repeat said process, until decomposing what is obtained
Data are monotonic function.
6. the ultrasonic imaging processing method according to claim 1 based on ultrasonic echo RF data, it is characterised in that described
RF data can be decomposed into several intrinsic mode functions, and the frequency range of intrinsic mode function is dynamic in step S4
's.
7. the ultrasonic imaging processing method according to claim 1 based on ultrasonic echo RF data, it is characterised in that described
In step S5, the instantaneous frequency of the intrinsic mode function is asked for, according to target detection expected frequency range to no natural mode
State function is modified, and removes noise signal.
8. a kind of ultrasonic imaging processing system based on ultrasonic echo RF data, it is characterised in that the system includes：
Signal transmitting and receiving module：For sending ultrasound emission signal to target detection object by ultrasonic probe, and receive it
Corresponding echo-signal；
Signal transmitting and receiving control module：Sequential is sent and received for control ultrasonic probe；
Signal processing module：For calculating the optimal weighting vector of ultrasound echo signal；Obtained for calculating in ultrasonic echo
RF signals；RF data are decomposed using empirical mode decomposition, obtain some intrinsic mode functions；It is each intrinsic for calculating
The instantaneous frequency of mode function；Each intrinsic mode function is modified respectively；For synthesizing revised RF data；
Image processing module：Handled for ultrasonic imaging, obtain detection target ultrasonoscopy.
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Cited By (7)
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| CN108888258A (en) * | 2018-05-18 | 2018-11-27 | 中国科学院半导体研究所 | A kind of electrocardiosignal characteristic area detection method applied to wearable device |
| CN109187771A (en) * | 2018-10-24 | 2019-01-11 | 国网内蒙古东部电力有限公司检修分公司 | A kind of low complex degree minimum variance ultrasonic imaging method that fusion feature value is decomposed |
| CN111358465A (en) * | 2020-03-19 | 2020-07-03 | 深圳大学 | Magnetic acoustic electric imaging system and method based on filtering inverse projection |
| CN112881016A (en) * | 2021-01-15 | 2021-06-01 | 西安交通大学 | Rolling bearing overlapped ultrasonic echo energy extraction method based on Gaussian model |
| CN113662587A (en) * | 2020-12-25 | 2021-11-19 | 四川省中医药科学院 | Portable fatty liver detection device based on ultrasound and data processing method thereof |
| JP2022087010A (en) * | 2020-11-30 | 2022-06-09 | ▲広▼州大学 | Time varying structure instantaneous frequency determination method, system, device, and storage medium |
| CN115586256A (en) * | 2022-12-09 | 2023-01-10 | 成都西交智汇大数据科技有限公司 | Method, device and equipment for detecting cleaning grade of experimental equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108888258A (en) * | 2018-05-18 | 2018-11-27 | 中国科学院半导体研究所 | A kind of electrocardiosignal characteristic area detection method applied to wearable device |
| CN109187771A (en) * | 2018-10-24 | 2019-01-11 | 国网内蒙古东部电力有限公司检修分公司 | A kind of low complex degree minimum variance ultrasonic imaging method that fusion feature value is decomposed |
| CN109187771B (en) * | 2018-10-24 | 2020-12-04 | 国网内蒙古东部电力有限公司检修分公司 | Low-complexity minimum variance ultrasonic imaging method fused with eigenvalue decomposition |
| CN111358465A (en) * | 2020-03-19 | 2020-07-03 | 深圳大学 | Magnetic acoustic electric imaging system and method based on filtering inverse projection |
| CN111358465B (en) * | 2020-03-19 | 2022-11-18 | 深圳大学 | Magnetic acoustic electric imaging system and method based on filtering inverse projection |
| JP2022087010A (en) * | 2020-11-30 | 2022-06-09 | ▲広▼州大学 | Time varying structure instantaneous frequency determination method, system, device, and storage medium |
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| CN113662587A (en) * | 2020-12-25 | 2021-11-19 | 四川省中医药科学院 | Portable fatty liver detection device based on ultrasound and data processing method thereof |
| CN112881016A (en) * | 2021-01-15 | 2021-06-01 | 西安交通大学 | Rolling bearing overlapped ultrasonic echo energy extraction method based on Gaussian model |
| CN115586256A (en) * | 2022-12-09 | 2023-01-10 | 成都西交智汇大数据科技有限公司 | Method, device and equipment for detecting cleaning grade of experimental equipment and storage medium |
| CN115586256B (en) * | 2022-12-09 | 2023-05-02 | 成都西交智汇大数据科技有限公司 | Method, device, equipment and storage medium for detecting cleaning grade of experimental equipment |
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