30 results about "Plane wave imaging" patented technology

The invention provides an ultrasonic phased array rapid full-focusing imaging detection method based on defect pre-positioning. The ultrasonic phased array rapid full-focusing imaging detection methodcomprises the steps of performing plane wave and full-matrix capture data collection on a target imaging area; carrying out coarse discretization processing on an imaging target imaging area, carrying out phase shift processing on the plane wave echo signal data set to obtain a plane wave imaging result, and carrying out pixel value analysis processing on the plane wave imaging result; carrying out defect positioning analysis on a plane wave imaging result through threshold processing, carrying out fine discretization processing on pixel points containing defects, and carrying out phase shiftprocessing on a full-matrix echo signal data set to obtain pixel values of the pixel points containing the defects; performing interpolation and amplification coefficient processing on unselected pixel points in the plane wave imaging result, and filling the corresponding grids with the pixel points; and obtaining a final imaging result. According to the method, an ultrasonic phased array plane wave algorithm and a full-focusing algorithm are combined, the time resolution is improved while the spatial resolution is kept, rapid ultrasonic phased array imaging detection is carried out on a component, and defects are effectively evaluated.

The invention belongs to the field of ultrasonic plane wave imaging and particularly relates to an ultrasonic plane wave imaging method based on a modified DMAS (delay-multiplication accumulative beamforming synthesis) algorithm, comprising the steps of 1) transmitting, by a FieldII-simulated B-mode ultrasound apparatus to emit a plane wave ultrasonic signal of certain composite angle; 2) calculating echo data square root of the plane wave ultrasonic signal and it's a cumulative sum item; 3) modifying the DMAS algorithm to obtain a DSBM (delay-accumulation multiplication beamforming) algorithm; 4) repeating the steps 2 to 3 to obtain data of each frame image; 5) acquiring a DSBMGCF (delay-accumulation multiplication beamforming generalized correlation coefficient) algorithm in conjunctionwith generalized correlation coefficient, and acquiring corrected imaging results according to the DSBMGCF algorithm. The advantages of the delay-multiplication accumulation beamforming synthesis algorithm and those of the generalized correlation coefficient are integrated; the problem that good plane wave spatial combination image quality and high imaging frame frequency cannot be attained at thesame time is solved at the premise of ensuring high imaging frame frequency, and fewer memory resources are utilized.

The invention discloses a plane wave beam forming method and system based on a double-regression convolutional neural network, and the method comprises the steps: collecting and preprocessing a multi-angle plane wave echo signal: collecting the multi-angle plane wave echo signal, preprocessing a single-angle plane wave echo signal, and obtaining a radio frequency signal cube; model training: taking a single-angle plane wave radio frequency signal cube as input, taking multi-angle plane wave composite data based on a delay superposition algorithm as a label, and training a pre-constructed double-regression convolutional neural network by using a stochastic gradient descent method; model prediction: taking a single-angle plane wave radio frequency signal cube as input, and predicting data after multi-angle plane wave beam synthesis based on the trained double-regression convolutional neural network; and obtaining a plane wave image through the steps of signal demodulation, logarithm compression and coordinate transformation. The invention also provides a system for implementing the method. According to the invention, the plane wave imaging quality is improved under the condition thatthe frame rate is not reduced.

The invention discloses an anti-perspective plane transformation-based ultrasonic plane wave imaging method. The method comprises the following steps of (1) collecting data; (2) preprocessing the data: converting imaging points on an original imaging plane into imaging points on a new plane by utilizing plane conversion, calculating delay time according to the imaging points on the new plane to obtain corrected delay time, then receiving and focusing the imaging points on the original imaging plane by utilizing a synthetic aperture focusing technology according to the corrected delay time, and obtaining a value of each imaging point on the original imaging plane; and (3) post-processing the data: performing envelope detection, logarithmic compression and grayscale mapping in sequence, and finally obtaining an ultrasonic plane wave imaging image. According to the method, a key delay time calculation mode is improved and matched with the synthetic aperture focusing technology, so that compared with the prior art, the problem of low plane wave imaging quality can be effectively solved and the ultrasonic plane wave imaging resolution is effectively increased.

The invention discloses an ultrafast composite plane wave imaging method based on a broadband acoustic metamaterial. The method is implemented through an ultrafast composite plane wave imaging device.The device comprises a transmission-receiving ultrasonic probe and an acoustic metamaterial structure. The method comprises the steps that the transmission-receiving ultrasonic probe is controlled togive out an ultrasonic signal at a preset transmission frequency and a first preset transmission angle; the preset transmission frequency is equal to a response frequency of the acoustic metamaterialstructure; the transmission-receiving ultrasonic probe is controlled to receive an echo signal reflected by a measured object at a preset receiving frequency and at a first preset receiving angle ora second preset receiving angle or a third preset receiving angle separately; the preset receiving frequency is n times of the preset transmission frequency; the first preset receiving angle is equalto the first preset transmission angle, the second preset receiving angle is smaller than the first preset transmission angle, and the third preset receiving angle is larger than the first preset transmission angle; the echo signal is adopted for reestablishing an image of the measured object. According to the method, the imaging depth and imaging quality can be improved.

The invention discloses an ultrahigh-resolution ultrasonic plane wave imaging method based on SOFI. The method comprises the following steps: with the intervention of an ultrasonic contrast agent (micro-vesicle), conducting ultrasonic plane wave imaging on an imaged object, so that a group of ultrasonic plane wave images at different moments; conducting a filtering operation on all acquired ultrasonic plane wave images, so as to remove noise in the ultrasonic plane wave images; based on ultrasonic plane wave data, which just contains one micro-vesicle, in an imaging area, determining and calculating a transverse full width at half maximum FHWMx and a longitudinal full width at half maximum FHWMy, so as to obtain a transverse standard difference [gamma]x and a longitudinal standard difference [gamma]y, so that a point spread distribution model is generated; and finally, with the dynamic ultrasonic plane wave image obtained from filtering as input data, conducting calculating, so that anSOFI image of second-order (or high-order) balancing is obtained. With the application of the method provided by the invention, spatial resolution of the ultrasonic plane wave imaging can be greatlyimproved, and moreover, time resolution of the ultrasonic imaging can be also improved; and the ultrasonic plane wave imaging method is applicable to rapid ultrahigh-resolution ultrasonic imaging.

A Doppler measurement system includes a random generator outputting a control signal encoding a random selection, and an ultrasonic array transducer for emitting a sequence of transmit pulses at a target at either an adjustable steering angle (plane wave imaging) or from a selectable non-sequential transducer element order (synthetic aperture imaging) corresponding to the random selection and for receiving an echo of each transmit pulse reflected from the target. Each transmit pulse is independently adjusted to a steering angle (plane wave imaging) or selectable transducer element order (synthetic aperture imaging) corresponding to a unique random selection so that the sequence of transmit pulses is a random sweep. The system can also include a memory for storing echo data, and a processor connected to the memory for using transmit data and echo data to extract a Doppler parameter. Methods of Doppler measurement and computer-readable medium can incorporating the measurement system.

The invention relates to a high-resolution defect nondestructive testing method based on combination of ultrasonic plane wave imaging and a time reversal operator. The method comprises the steps: transmitting a group of plane waves to a measured workpiece through an ultrasonic linear phased array, acquiring reflection echo data of each plane wave by using the ultrasonic phased array, and carrying out time domain filtering on the echo data to filter random noise in a signal; extracting the edge information of each defect in an scanned image through an edge extraction method and serving as basic information of the internal defect of the measured workpiece, wherein the basic information comprises position information, shape information and size range information of the defect; and carrying out automatic focusing on defect signals by using the feature vector of the time reversal operator, carrying out accurate imaging on each obtained defect area, and carrying out accurate positioning on the defects of the whole measured workpiece.

The invention provides an ultrasonic plane wave imaging method and device based on frequency domain migration and a storage medium. The method comprises the steps of obtaining echo signals received at three emission angles; constructing echo signal frequency domain space coordinates corresponding to the image frequency domain space coordinates; carrying out fast Fourier transform (FFT) on the echo signal at each emission angle in the space direction, and carrying out non-uniform Fourier transform (NUDFT) on the obtained frequency spectrum signal in the time direction to obtain the coordinates of the echo signal in the frequency domain space of the echo signal; completing calculation of the non-uniform Fourier transform based on a low-rank matrix constructed by using a Chebyshev polynomial; and carrying out inverse fast Fourier transform (IFFT) on the filtered signals, compounding the echo signals at the three emission angles, and then carrying out inverse fast Fourier transform to obtain a compounded ultrasonic image. According to the invention, the ultrasonic plane wave imaging speed is greatly increased, a high-quality image can be obtained, and a relatively high imaging frame frequency can be ensured.

The invention provides an ultrasonic plane wave imaging method and device and a storage medium. The method comprises the steps: processing a natural image; obtaining ultrasonic simulation images whichare similar to real ultrasonic images and are large in number, training a deep learning network by utilizing the massive ultrasonic simulation images, and applying a training model meeting conditionsto a real small-scale ultrasonic data set for transfer learning to obtain a practical model with strong robustness and high generalization; employing low-quality plane wave ultrasonic images at threeangles, and directly generating an ultrasonic image which is consistent with or even higher than an image obtained through multi-angle composite imaging in quality through a trained deep learning network, thereby keeping the advantages that the plane wave ultrasonic imaging speed is high and the frame rate is high to the maximum extent. The problems that in an existing ultrasonic plane wave imaging method based on deep learning, training data are few, an over-fitting phenomenon exists, and a practical model high in robustness and generalization cannot be obtained are solved.

The embodiment of the invention provides a correction method for plane ultrasonic transcraniocerebral imaging, which compensates and corrects ultrasonic distortion caused by a skull by utilizing a skull acoustic parameter model and combining an ultrasonic plane wave imaging method, so that an imaging result can be accurately positioned, artifacts caused by the skull are reduced. And a basic imaging technology is provided for craniocerebral ultrasonic imaging equipment.

The invention provides a rapid ultrasonic plane wave imaging detection method based on spatial weighted optimization. The method comprises the following steps: collecting plane wave data; calculatinga spatial weight by setting an ultrasonic plane wave effective action area at each angle, and obtaining a plane wave image in the effective action area at each angle by calculating the delay of each pixel point; repeatedly combining and superposing the plane wave imaging result and the space weight under a single angle to obtain a plane wave imaging result under multiple angles and a total weighton an imaging space; and optimizing the ultrasonic multi-angle plane wave composite imaging result by using the total weight in the imaging area to obtain a final imaging result. According to the method, on the basis of guaranteeing the defect detection spatial resolution, rapid defect imaging and small defect amplitude attenuation are achieved, and the detection capacity and the imaging frame rate of plane wave imaging are effectively enhanced under the small effective aperture.

The invention discloses a high-resolution defect nondestructive testing method based on combination of a Canny operator and ultrasonic plane wave imaging. The method comprises the following steps of: 1, transmitting a plane wave to a tested workpiece by utilizing ultrasonic coherence, and receiving echo data of random noise in a filtered signal; 2, performing full-focusing imaging on the echo data in the step 1 by using a DMAS algorithm; step 3, carrying out edge detection on an imaging picture obtained by full-focusing imaging in the step 2 by utilizing defects of a Canny operator; and 4, based on the defect edge detection in the step 3, carrying out fine scanning on the obtained defects in a point-by-point focusing mode. The method is used for solving the problems of low nondestructive detection speed and low detection precision of the defects of the detected workpiece, so that the quality control in industrial production is improved.

The invention discloses an ultrahigh-resolution ultrasonic plane wave imaging method based on SOFI. The method comprises the following steps: with the intervention of an ultrasonic contrast agent (micro-vesicle), conducting ultrasonic plane wave imaging on an imaged object, so that a group of ultrasonic plane wave images at different moments; conducting a filtering operation on all acquired ultrasonic plane wave images, so as to remove noise in the ultrasonic plane wave images; based on ultrasonic plane wave data, which just contains one micro-vesicle, in an imaging area, determining and calculating a transverse full width at half maximum FHWMx and a longitudinal full width at half maximum FHWMy, so as to obtain a transverse standard difference [gamma]x and a longitudinal standard difference [gamma]y, so that a point spread distribution model is generated; and finally, with the dynamic ultrasonic plane wave image obtained from filtering as input data, conducting calculating, so that anSOFI image of second-order (or high-order) balancing is obtained. With the application of the method provided by the invention, spatial resolution of the ultrasonic plane wave imaging can be greatlyimproved, and moreover, time resolution of the ultrasonic imaging can be also improved; and the ultrasonic plane wave imaging method is applicable to rapid ultrahigh-resolution ultrasonic imaging.

Plane Wave Imagers (PWI) directly sense the amplitude and phase of electromagnetic waves and do not require a lens to image a scene. PWI's can also be used in the exit pupil of an afocal lens. PWI's are implemented in CMOS using silicon waveguide technology. Since the wavelength of light ranges from less than one to tens of microns, PWI's fabricated on silicon are essentially flat plates, making a PWI a thin and light structure. A CMOS PWI can operate in the visible, near infrared, short wave infrared, and mid wave thermal spectral bands. Benefits of using a PWI include the ability to achieve large optical aperture performance by digitally processing the outputs of multiple small aperture PWI's that are not necessarily precisely optically aligned. Enhanced scene resolution can be obtained by collecting imagery from several adjacent positions and then digitally combining the digital data into one large dataset.

Plane Wave Imagers (PWI) directly sense the amplitude and phase of electromagnetic waves and do not require a lens to image a scene. PWI's can also be used in the exit pupil of an afocal lens. PWI's are implemented in CMOS using silicon waveguide technology. Since the wavelength of light ranges from less than one to tens of microns, PWI's fabricated on silicon are essentially flat plates, making a PWI a thin and light structure. A CMOS PWI can operate in the visible, near infrared, short wave infrared, and mid wave thermal spectral bands. Benefits of using a PWI include the ability to achieve large optical aperture performance by digitally processing the outputs of multiple small aperture PWI's that are not necessarily precisely optically aligned. Enhanced scene resolution can be obtained by collecting imagery from several adjacent positions and then digitally combining the digital data into one large dataset.

The invention provides methods and systems for ultrasonic imaging and microbubble imaging of plane waves based on compressive adaptive beam forming. The compressive adaptive beam forming algorithm is adopted, each array element receives useful frequency point information of data, and the useful frequency point information is all centralized in effective bandwidth of an ultrasonic echo signal, so that the data in the effective bandwidth is subjected to compressive sensing treatment instead of the whole frequency domain, and on the basis of frequency-domain adaptive beam forming, the number of frequency-domain sampling points is reduced and calculated amount required during beam forming is reduced; plane wave imaging is adopted, so that a problem of transient change of microbubbles in conventional ultrasonic imaging is solved; the whole microbubble distribution region is covered by emitting planar ultrasonic waves once, so that a microbubble distribution image in the whole imaging plane is obtained; microbubble imaging of ultrasonic plane wave emission is adopted, so that the time resolution on microbubble imaging is very high.

The invention provides a shear wave velocity estimation method and system based on a real-time curve tracking technology, which can improve the defects of a peak time algorithm and improve the accuracy of shear wave velocity estimation so as to obtain a shear wave velocity image with higher quality. Comprising the following steps: exciting to generate shear waves at a set position by using a multi-focus shear wave excitation method; capturing the generated shear wave by adopting an ultra-fast plane wave imaging technology and extracting shear wave information; acquiring a shear wave real-time tracking curve in the target area according to the extracted shear wave information, and performing curve fitting; and estimating the shear wave speed of the target area according to the fitted shear wave real-time tracking curve.

An ultrasonic imaging method and device, and a computer-readable storage medium, the method comprising: acquiring multi-angle imaging data during the plane wave imaging process, the multi-angle imaging data being imaging data at multiple deflection angles (S101); , calculate the correlation coefficient between the adjacent angle imaging data in the multi-angle imaging data, the adjacent angle imaging data is the imaging data corresponding to two adjacent deflection angles among the multiple deflection angles (S102); according to the correlation coefficient, the corresponding The enhancement coefficient of the positive correlation of the correlation of the adjacent angle imaging data, the enhancement coefficient is the coefficient corresponding to the multi-angle imaging data (S103); using the enhancement coefficient, the multi-angle composite data or the multi-angle imaging data are processed to obtain the enhanced image (S104) . The method can reduce the noise in the composite image and improve the contrast resolution of the composite image.

The invention provides a spatial compounding method of an ultrasonic image and ultrasonic equipment. The method comprises the following steps: acquiring a deflection angle required for transmitting a plane wave; transmitting the plane wave according to the deflection angle to obtain a target frame number of plane wave images; determining an overlapping region of a pre-acquired frame of focused wave image and the target frame number of plane wave images; and carrying out spatial compounding on the overlapping region of the frame of focused wave image and the target frame number of plane wave images to obtain a frame of ultrasonic image. Therefore, the ultrasonic image is obtained by spatially compositing the overlapping area of the focusing wave image and the plane wave image of the target frame number. The resolution, the signal-to-noise ratio and the contrast ratio of the image can be ensured by the focused wave image, and the influence of artifacts such as speckle noise, clutter and sound shadow can be weakened after the focused wave image is fused with the plane wave, so that the problem that a relatively good image effect cannot be obtained during space compounding in the prior art is solved.

The invention discloses a fluorescent light sheet microscopic imaging system and method. The fluorescent light sheet microscopic imaging system includes a detection device, a correction device, an imaging device and a control device, wherein: the detection device is used to detect the wavefront of each preset isohalo region of the tissue plane imaging field of view inside the living sample aberration distortion, and send it to the control device, the control device is used to send correction instructions to the correction device according to the received wavefront aberration distortion, and the correction device is used to send correction instructions to the correction device according to the received The correction instruction is used to perform at least one wavefront correction on each of the isohales at the same time, and the imaging device is used to image the tissue plane after wavefront correction. The invention helps to obtain a deep biological tissue plane with a large field of view and high temporal and spatial resolution.

Plane Wave Imagers (PWI) directly sense the amplitude and phase of electromagnetic waves and do not require a lens to image a scene. PWI's can also be used in the exit pupil of an afocal lens. PWI's are implemented in CMOS using silicon waveguide technology. Since the wavelength of light ranges from less than one to tens of microns, PWI's fabricated on silicon are essentially flat plates, making a PWI a thin and light structure. A CMOS PWI can operate in the visible, near infrared, short wave infrared, and mid wave thermal spectral bands. Benefits of using a PWI include the ability to achieve large optical aperture performance by digitally processing the outputs of multiple small aperture PWI's that are not necessarily precisely optically aligned. Enhanced scene resolution can be obtained by collecting imagery from several adjacent positions and then digitally combining the digital data into one large dataset.

The invention provides an ultrahigh-resolution ultrasonic imaging method based on complex cumulant analysis, which is characterized by comprising the following steps of: firstly, carrying out Hilbert transform on a real number field signal of an obtained original ultrasonic plane wave image to obtain a complex number field ultrasonic signal; then, constructing a complex field cumulant analysis framework to carry out high-order cumulant analysis processing on complex field ultrasonic signals, so that a statistical framework of ultrasonic image data is expanded, the problem of axial oscillation of real number field signals caused by bipolar pulse response of the ultrasonic signals is solved; and finally carrying out deconvolution processing on a complex cumulant result obtained by complex cumulant analysis processing to further improve the spatial resolution of ultrahigh-resolution ultrasonic imaging.

A Doppler measurement system includes a random generator outputting a control signal encoding a random selection, and an ultrasonic array transducer for emitting a sequence of transmit pulses at a target at either an adjustable steering angle (plane wave imaging) or from a selectable non-sequential transducer element order (synthetic aperture imaging) corresponding to the random selection and for receiving an echo of each transmit pulse reflected from the target. Each transmit pulse is independently adjusted to a steering angle (plane wave imaging) or selectable transducer element order (synthetic aperture imaging) corresponding to a unique random selection so that the sequence of transmit pulses is a random sweep. The system can also include a memory for storing echo data, and a processor connected to the memory for using transmit data and echo data to extract a Doppler parameter. Methods of Doppler measurement and computer-readable medium can incorporating the measurement system.

The invention belongs to the field of ultrasonic plane wave imaging, and in particular relates to an ultrasonic plane wave imaging method based on an improved DMAS algorithm, comprising the following steps: 1) transmitting a plane wave ultrasonic signal at a certain composite angle through a B-ultrasonic device simulated by FieldII; 2) calculating the plane wave The square root of the echo data of the ultrasonic signal and its cumulative sum item; 3) the delay-multiply-accumulate beamforming algorithm, namely DMAS, is improved to obtain the delay-multiply-multiply-multiply beamforming algorithm, namely the DSBM algorithm: 4) repeat steps 2 to Step 3, obtaining each frame of image data; 5) Combining with the generalized coherence coefficient, obtain the DSBMGCF algorithm, and obtain the corrected imaging result according to the algorithm. The present invention combines the advantages of the time-delay multiply-accumulate beamforming algorithm and the generalized coherence coefficient, and solves the problem that the image quality and the imaging frame frequency of the plane wave spatial composite imaging cannot be achieved at the same time under the premise of ensuring a relatively high imaging frame rate, and The utilization rate of memory resources is saved.

The invention relates to a design method of a verification test block suitable for plane wave ultrasonic imaging system demonstration. The design method comprises the following steps: determining thesize of the test block; determining character positions; determining fonts and font sizes of the characters; determining the position of the transverse through hole: drawing the shape of the characterthrough multiple line segments or arcs, dividing the multiple line segments and / or arcs into a plurality of parts, drawing a circle representing the transverse through hole at each division point, determining the position of the transverse through hole on the test block, and obtaining a character sketch; and carrying out verification: importing the character sketch into ultrasonic simulation software, placing a transverse through hole with a designed size in each circular area, selecting plane wave imaging, carrying out simulation calculation, and determining the effectiveness of the test block. According to the design method of the verification test block suitable for plane wave ultrasonic imaging system demonstration, the through transverse through hole is formed in the thickness direction of the test block to form the character, when the verification test block performs plane wave imaging, the probe only needs to move in the length direction of the test block, the demonstration program speed is high, and the thickness of the test block is not limited.

The invention discloses an ultrafast composite plane wave imaging method based on a broadband acoustic metamaterial. The method is realized by an ultrafast composite plane wave imaging device; the device includes a transmitting and receiving ultrasonic probe and an acoustic metamaterial structure. and Respectively receive the echo signal reflected by the measured object at the first preset receiving angle, the second preset receiving angle and the third preset receiving angle; the preset receiving frequency is n times the preset transmitting frequency; the first preset receiving The angle is equal to the first preset transmitting angle, the second preset receiving angle is smaller than the first preset transmitting angle, and the third preset receiving angle is larger than the first preset transmitting angle; the echo signal is used to reconstruct the image of the measured object. The invention can improve imaging depth and imaging quality.

The invention discloses an image synthesis method for accelerating ultrasonic multi-plane wave imaging by using GPU parallel computing. The method comprises the following steps of: S1, setting different emission delays of transducer units of an ultrasonic probe, and sequentially emitting ultrasonic plane wave scanning imaging spaces with different emission angles; S2, reflecting the emitted ultrasonic signal back to the ultrasonic probe, receiving an ultrasonic echo signal by each transducer unit, and converting the ultrasonic echo signal into a radio frequency RF signal after a series of processing such as filtering, sampling and gain in an analog front end; S3, generating a composite image by using the radio frequency signal through the following post-processing steps of: vectorizing the radio frequency signals acquired by all channels by using a CPU; performing Hilbert transform of GPU parallel computing acceleration on the radio frequency signals by using the GPU, and synthesizing the composite image by using a GPU parallel computing accelerated DAS algorithm; and S4, displaying the synthesized composite image on a display device. The ultrasonic ultra-fast imaging post-processing algorithm has good parallel computing applicability, and image reconstruction can be carried out by using high-performance computing platforms such as a GPU, so that the computing efficiency of image reconstruction is improved.