20 results about "Plane wave imaging" patented technology

The invention discloses an ultrafast three-dimensional wave number domain imaging method based on a row-column addressing ultrasonic array, which realizes ultrafast three-dimensional ultrasonic volume imaging by combining wave number domain image reconstruction based on row-column addressing (RCA) ultrasonic array probe data acquisition. According to the method, the three-dimensional volume imaging capability and channel number advantages of an RCA ultrasonic array probe and fewer emission times of plane wave imaging (PWI) are utilized, so that the volume acquisition rate is increased, and the data volume is reduced; according to the method, wave number domain image reconstruction is executed, rapid reconstruction of three-dimensional volume data can be realized by utilizing the calculation efficiency of fast Fourier transform, and the three-dimensional imaging requirements of high resolution and high frame rate are met. Compared with a time domain delay superposition algorithm, the method has remarkable technical advantages and is expected to be popularized and applied to medical and industrial detection scenes needing real-time three-dimensional volume imaging.

The invention discloses a magnetic nanoparticle concentration distribution inversion method and a related device, and relates to the technical field of biomedical engineering.The method comprises the steps that firstly, magnetic nanoparticles in biological tissue are excited through an external magnetic field to generate infinitesimal displacement; and then ultrasonic equipment is adopted to collect ultrasonic ultrafast plane wave imaging data and carry out axial vibration displacement detection, axial vibration displacement actual measurement data and corresponding discrete space and time coordinates are input into the inversion model for iterative inversion, and a magnetic nanoparticle concentration distribution inversion result is obtained. A loss function of the inversion model includes a data-driven loss item and a physical information-driven loss item (based on a Navie equation). Compared with the prior art, the method has the advantages that the physical information neural network is introduced, control equations such as a nano-dimension equation and the like are encoded to the full-connection neural network, physical equations do not need to be excessively simplified, complex and time-consuming modeling for an experimental environment is not needed to obtain simulation data, and higher accuracy and stability are achieved.

The invention provides an ultrasonic plane wave inverse problem imaging optimization method and system and an ultrasonic imaging device, and belongs to the technical field of ultrasonic imaging, and the method comprises the steps: constructing a space coordinate system of an image in ultrasonic plane wave imaging; constructing a sampling matrix according to the space coordinate system of the image and the parameters of the transmitted ultrasonic plane waves, and weighting in combination with the directivity of the transducer element and the geometric information of the image to keep sparsity; based on the weighted sampling matrix, constructing a low-rank sparse optimization model of an ultrasonic plane wave inverse problem; and carrying out beam forming updating, nuclear norm updating and sparse item and Lagrange item updating on the low-rank sparse optimization model, and carrying out envelope detection, logarithm compression and gray mapping to obtain a final optimized ultrasonic image. According to the method, the advantage of high frame rate of plane wave imaging is fully utilized, spot textures are reserved, the imaging speed is high, meanwhile, the resolution ratio and the contrast ratio of the ultrasonic image are improved, and the imaging quality is improved.

This invention discloses a method, system, and electronic device for determining blood flow velocity profiles. The method includes performing ultrasound plane wave imaging on a target region of a blood vessel according to a preset angle sequence to obtain multiple ultrasound plane wave images at the current moment; performing motion compensation on multiple ultrasound plane wave images to be compensated, centered on a central ultrasound plane wave image, to obtain multiple compensated ultrasound plane wave images at the current moment; coherently combining the central ultrasound plane wave image and the multiple compensated ultrasound plane wave images to obtain a single frame of composite ultrasound image at the current moment; determining the blood flow velocity at different radial positions within the blood vessel lumen within a time interval of interest using speckle tracking; and constructing a blood flow velocity profile of the target region based on the blood flow velocities at different radial positions within the blood vessel lumen corresponding to the time interval of interest. This invention improves the accuracy of blood flow velocity profile determination by performing local motion compensation on multi-angle plane wave composite imaging.

The invention belongs to the technical field of ultrasonic equipment, and particularly relates to an ultra-fast ultrasonic imaging method, system and equipment. In order to effectively solve the problem that ultra-fast imaging is difficult to realize in a miniaturized ultrasonic system, the complexity of the whole system is reduced by designing a sub-aperture control system for transmitting and receiving, so that the plane wave imaging design of space splicing is realized, and the ultra-fast ultrasonic imaging method is completed. The technical scheme of the invention has the advantages of low system complexity, low resource consumption during operation, high data transmission stability and rate and the like, is beneficial to the application of miniaturized ultra-fast ultrasonic imaging equipment, and has a good application prospect.

The embodiment of the invention provides a cable insulation defect detection method and device based on ultrasonic plane wave imaging, and the method comprises the steps: responding to a user operation, and transmitting a plurality of groups of ultrasonic plane waves to a to-be-detected cable at a plurality of deflection angles; collecting multiple groups of echo data corresponding to the multiple groups of ultrasonic plane waves; a detection image of the to-be-detected cable is compositely constructed through delay superposition calculation based on the multiple sets of echo data; and obtaining a target pixel of which the pixel value meets a preset condition in the detection image, and determining a cable insulation defect position based on the target pixel. The ultrasonic plane wave superposition and the image space coherence are combined to form a set of diagnosis standard for power cable insulation defect state analysis, the type and severity of the power cable insulation defect are clearly given by combining the diagnosis standard, and rapid field judgment can be carried out, so that the concerned power cable insulation defect state is rapidly judged, and the power cable insulation defect state analysis efficiency is improved. And a scientific and reasonable decision is provided for the maintenance and operation of testing the insulation of the power cable.

The invention relates to the technical field of ultrasonic defect detection, in particular to a dry-type sleeve defect detection method and system based on an ultrasonic phased array, and the method comprises the steps: obtaining a sonic path distance from each pixel point in single plane wave imaging corresponding to each deflection angle to each transmitting array element and each receiving array element, obtaining the total flight time from each pixel point to each transmitting array element and each receiving array element in single plane wave imaging according to the sound path distance and the focusing delay of each transmitting array element; obtaining full-matrix data according to the total flight time; obtaining the superposed signal intensity of each pixel point in the single plane wave imaging corresponding to each deflection angle, and obtaining a weighted composite image through weighting; performing post-processing and segmentation on the weighted composite image to obtain a plurality of new connected domains; and screening out bubble defect connected domains from all the new connected domains through the new connected domain areas. According to the invention, the accuracy of defect detection of the dry-type bushing is improved.

The invention discloses a full-matrix signal conversion method for driving apodization plane wave signals to a synthetic emission aperture (STA) by a self-supervised convolutional neural network (CNN) for high-quality two-dimensional ultrasonic imaging, an ultrasonic imaging system and a medium. The method comprises the following steps: designing a self-supervised learning CNN model based on a linear acoustic superposition principle; training the CNN model by using the simulation STA full matrix signal; an optimized binary weight is extracted from a CNN model encoder convolutional layer to serve as emission apodization, and plane wave signals are collected; inputting the apodization plane wave signal into a CNN model decoder to convert and generate an STA full-matrix signal; and performing beam forming based on the generated STA full-matrix signal so as to reconstruct a high-quality B ultrasonic image. According to the method, apodization plane wave signals can be well converted into STA full-matrix signals so as to carry out high-quality two-dimensional ultrasonic imaging, and the problem that the plane wave imaging quality is poor can be solved to a certain extent.

The present application discloses a method for inverting the concentration distribution of magnetic nanoparticles and related devices, which relate to the field of biomedical engineering technology. The method first uses an external magnetic field to stimulate the magnetic nanoparticles in biological tissue to produce tiny displacements, then uses ultrasonic equipment to collect ultrasonic ultrafast plane wave imaging data and detect axial vibration displacement. The measured axial vibration displacement data and the corresponding discrete space and time coordinates are input into the inversion model for iterative inversion to obtain the inversion result of the magnetic nanoparticle concentration distribution. The loss function of the inversion model includes a data-driven loss term and a physical information-driven loss term (based on the Navier equation). Compared with traditional technologies, this method introduces a physical information neural network and encodes the control equations such as the Navier equation into a fully connected neural network. There is no need to oversimplify the physical equations, nor is there a need for complex and time-consuming modeling of the experimental environment to obtain simulation data, and it has higher accuracy and stability.

The present invention discloses a phase-shift-based ultrasonic plane wave rapid imaging method for accurately and efficiently imaging multi-layer media. This method features reduced data storage and processing requirements, faster reconstruction speed, and deeper penetration depth. To obtain accurate and clear imaging results, two linear array transducers are used to obtain the sound velocity distribution of the imaging area. Based on the sound velocity distribution and the phase-shift algorithm, the sound field is accurately and efficiently extrapolated. Finally, the final images obtained by the two transducers are fused to obtain a high-quality reconstruction result. Under the same conditions, this method can achieve a deeper penetration depth than traditional phase-shift-based synthetic aperture ultrasonic imaging, and can achieve imaging of multi-layer media with five-layer structures.

Methods and systems of ultrasonic imaging multiple depth zones. One method includes imaging a first zone using multi-angle plane wave imaging, imaging a second zone using tissue harmonic imaging, and forming a 3D image based on the received signals from the first zone and the second zone. The imaging for each zone is “thick slice” imaging, generating multiple slices through the imaged medium. Multiple frequencies can also be used. The depth of each zone can vary based on the ultrasonic array, and correspondingly, the F# used for imaging the zone. In an example, zones can be imaged at different F#'s, for example, at F#1 for the first zone, at F#2, F#3, or F#6 for one or more zones that extend deeper into the object than the first zone. Such methods can include blending the transitions between the first and the second zone, and / or generating interpolated frames between directly imaged frames.

The present application relates to the technical field of ultrasonic defect detection, and particularly relates to a dry casing defect detection method and system based on an ultrasonic phased array, which comprises the following steps: obtaining the sound path between each pixel point in single plane wave imaging corresponding to each deflection angle and each transmitting array element and each receiving array element, obtaining the total flight time of each pixel point in single plane wave imaging to each transmitting array element and each receiving array element according to the sound path and the focusing delay of each transmitting array element; obtaining the superimposed signal intensity of each pixel point in single plane wave imaging corresponding to each deflection angle according to the total flight time and full matrix data, and obtaining a weighted composite image through weighting; performing post-processing and segmentation on the weighted composite image to obtain a plurality of new connected domains; and screening a bubble defect connected domain from all new connected domains through the area of the new connected domain. The present application improves the accuracy of dry casing defect detection.

Described here are systems and methods for ultrasound clutter filtering to produce images of blood flow in a subject. The systems and methods described in the present disclosure may be advantageously applied to fast ultrasound imaging techniques, including ultrafast plane wave imaging techniques.

Techniques based on compressive sensing may be used to reduce the count of channels required to collect analog signals from a multi-element PAUT probe, such as with a plane wave imaging (PWI) acquisition method in which multiple elements are simultaneously excited for emission. Such a method makes it possible to significantly simplify the hardware architecture of the instrument, such as to reduce the complexity of routing of probe assemblies or associated interconnects. A portion or all of an analog front end (AFE) may be embedded in the probe itself. The use of the present teachings may include reconstructing received signals corresponding to various elements of the probe, with as few as a single analog channel for reception. As an example, as little as a single pulser may be used in transmission, and as little as a single analog-to-digital converter (ADC) may be used in reception.

The invention discloses a concrete internal crack detection method based on an ultrasonic plane wave imaging technology. The method comprises the following steps: establishing a concrete internal simulation model; scanning and imaging the concrete internal simulation model by adopting plane waves with different deflection angles; determining crack detection angles corresponding to different plane wave deflection angles; determining the actual crack angle according to the different plane wave deflection angles and the corresponding crack detection angles; performing composite plane wave imaging by taking the actual angle of the crack as the center to obtain a concrete internal crack image; and calculating the crack length according to the concrete internal crack image. According to the method, the internal crack of the concrete can be accurately calculated. Compared with a traditional composite plane wave imaging method, the method has the advantages that the concrete internal crack detection precision is greatly improved, and a theoretical basis is provided for concrete internal crack refined detection.

The application provides an ultrasonic plane wave inverse problem imaging optimization method and system and an ultrasonic imaging device, belongs to the technical field of ultrasonic imaging, and constructs a spatial coordinate system of an image in ultrasonic plane wave imaging; a sampling matrix is constructed according to the spatial coordinate system of the image and parameters of transmitted ultrasonic plane waves, and is weighted in combination with directivity of a transducer element and geometric information of the image to maintain sparsity; a low-rank sparse optimization model of the ultrasonic plane wave inverse problem is constructed based on the weighted sampling matrix; the low-rank sparse optimization model is updated through beam forming, kernel norm updating and sparse term and Lagrange term updating, and an ultimately optimized ultrasonic image is obtained through envelope detection, logarithmic compression and gray scale mapping. The application fully utilizes the advantage of high frame rate of plane wave imaging, retains spot texture, is fast in imaging speed, improves the resolution and contrast of the ultrasonic image, and improves the imaging quality.

The application provides a kind of medical ultrasonic equipment multimode holographic spectrum implementation method and device, including: emitting short pulse waveform to the examination site of patient, obtaining the first image of the patient, then emitting long pulse waveform of N groups of preset deflection angles, obtaining N frames of plane wave images of patient, respectively dividing each plane wave image into several frame sub-images, and respectively performing weighted processing on each frame of the sub-image according to the preset deflection angle, obtaining the key information area of patient, obtaining the spectrum data of key information area, drawing the corresponding spectrum image according to the spectrum data, filling the data of the spectrum image using the first image, obtaining the second image of patient, performing foreground extraction on the second image, obtaining the blood flow signal of patient, generating the third image of the patient according to the blood flow signal and displaying, with the implementation method and device of full-class probe multimode holographic spectrum, it can be conveniently and quickly deployed in medical color doppler ultrasound equipment system.

An intravascular ultrasound (IVUS) catheter includes a flexible elongate member position-able within a blood vessel of a patient and a circumferential array of acoustic elements. Each acoustic element of the circumferential array is configured to transmit ultrasound energy and receive echoes associated with the transmitted ultrasound energy. Processor(s) communicate with the circumferential array. The processor(s) control a first aperture of the circumferential array to transmit a first ultrasound plane wave. The first aperture includes a first plurality of acoustic elements forming a first circumferential portion of the circumferential array. The processor(s) control the first aperture to receive echoes corresponding to the first ultrasound plane wave. The processor(s) generate a circumferential ultrasound image based on the echoes corresponding to the first ultrasound plane wave. The processor(s) output the circumferential ultrasound image to a display in communication with the processor.

The invention relates to the technical field of nondestructive testing and structural health monitoring, in particular to a defect monitoring method for a composite gas cylinder and a flexible ultrasonic monitor. The defect monitoring method of the composite material gas cylinder comprises the following steps: collecting echo signals generated by reflecting plane waves emitted into the composite material gas cylinder at different incident angles; and obtaining plane wave imaging data of each angle through convolution operation and a delay summation algorithm in sequence. And fusing the plane wave imaging data of the multiple angles to obtain a multi-angle plane wave composite image, and obtaining a plurality of differential images. And positioning the position of the defect in the monitoring area according to the local gray abnormal position in the multi-angle plane wave composite image and in combination with a space coordinate mapping technology. And a plurality of difference images are compared according to a time sequence to obtain the change rule of each defect in the monitoring area, so that the future change trend of each defect in the monitoring area is deduced, and long-term continuous monitoring and state evaluation can be carried out on the detected structure.

The application discloses a kind of based on row-column addressing ultrasonic array's superfast three-dimensional wave number domain imaging method, based on row-column addressing (RCA) ultrasonic array probe data acquisition, combined with wave number domain image reconstruction, realize superfast three-dimensional ultrasonic volume imaging.This method uses the three-dimensional volume imaging capability and channel number advantage of RCA ultrasonic array probe, and the transmission number of plane wave imaging (PWI) is less, accelerates volume acquisition rate and reduces data volume;Perform wave number domain image reconstruction, utilize the calculation efficiency of fast Fourier transform, can realize the fast reconstruction of three-dimensional volume data, meet the three-dimensional imaging needs of high resolution, high frame rate.This method has significant technical advantages compared with time domain delay-and-sum algorithm, and is expected to be popularized and applied to medical and industrial detection scenarios requiring real-time three-dimensional volume imaging.