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 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 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.

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 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.

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.

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.

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.