64 results about "Ultrasonic Tomography" patented technology

An image showing the spatial distribution of the hardness of a tissue of an object to be examined from which the influence of the pressure amount is eliminated is displayed.

From ultrasonic tomography data measured by pressing the tissue, a physical quantity relating to the distortion of the tissue at measurement points of the tissue is determined.

An elasticity image of the tissue is created according to the physical quantity.

The physical quantities at the measurement points are indexed by using the physical quantity in a reference region determined in the elasticity image as a reference, and an indexed elasticity image showing the distribution of the index value is created.

The invention provides a method using ultrasonic wave to detect the bonding quality. The method comprises the following steps: (1) utilizing an ultrasonic wave characteristic scanning technology to find the characteristic waves of rubber, a bonding agent, and a metal member, carrying out ultrasonic tomography in a designated depth range through ultrasonic waves to obtain the de-bonding area or weak-bonding area in any region, automatically recognizing the de-bonding areas and weak-bonding areas by a computer, and then individually calculating the de-bonding area and weak-bonding area; (2) according to the results of characteristic wave imaging, judging the bonding quality. In the step two, simulation software is adopted to calculate the area of each defect and the elastic amplitudes of all defect areas so as to judge the relative bonding strength of each defect area. According to the provided ultrasonic detection method, computer simulation recognition and control technologies are adopted, the artificial uncertain factors in conventional sampling method are reduced, the stability of monitoring technology is improved, thus the reliability of quality of bonded products is improved, and an aviation quality acceptance standard suitable for aviation products is mapped out.

The invention provides an iterative ultrasonic tomography method for the axial flow field imaging in a pipeline. The method comprises the steps of constructing a dense sound channel network by ultrasonic sensors large in emission angle and arranged on the upstream and downstream cross sections of a pipeline, exciting to receive an ultrasonic signal, acquiring the average flow velocity of the axial flow field of the pipeline along each sound channel through calculating the time for the ultrasonic wave to spread in the clockwise direction of each sound channel so as to obtain a plurality of original projection data, grouping the projection data into parallel sound channel groups for interpolation and subdivision, expanding the number of projection data, discretizing a to-be-constructed pipeline axial flow velocity field image, and reconstructing a pipeline axial flow velocity field through the iterative tomography of projection data in the prior constraint condition. According to the technical scheme of the invention, on the condition that the original fluid state is not disturbed, the distribution of the axial flow field in the pipeline can be detected. Furthermore, the high-precision reconstruction of the axial flow field of the pipeline is realized.

The invention relates to an ultrasonic imaging synchronous algebra iterative reconstruction method based on total variation regularization constraint, which is used for ultrasonic tomography and comprises the following steps: acquiring a projection attenuation measurement value required by reconstruction; Constructing a coefficient matrix, and considering the geometric position of the overlapped region relative to the field domain pixel while considering the overlapping area ratio of the projection path to the field domain pixel; Performing imaging preprocessing by using a synchronous algebrareconstruction method; Establishing a regularization weighting least square method framework, regularizing the total variation as a regularization item, taking a synchronous algebraic iterative reconstruction method as an algebraic item, and carrying out inverse problem iterative reconstruction calculation; And performing iteration until the residual error meets the requirement.

The invention relates to a multi-mode curved surface phased array ultrasonic tomography device. The device is used for reconstructing the phase distribution of oil-gas-water three-phase fluid flowingthrough the to-be-measured section of a pipeline. The multi-mode curved surface phased array ultrasonic tomography device comprises an ultrasonic sensor array, a signal control module, a high-voltageexcitation module, a signal acquisition and demodulation module, an industrial bus and an upper computer module; different modes of the signal control module can be gated, so that the signal control module can control the excitation and measurement processes of all the other modules and the sensor array through a fixed time sequence; under the control of the signal control module, the high-voltageexcitation module generates excitation voltage signals of which the duration, frequency and duty ratio are adjustable, and applies the excitation voltage signals to excitation ultrasonic sensors; induction voltage signals received by the ultrasonic sensors are recorded, processed and subjected to analog-to-digital conversion through the signal acquisition and demodulation module; and obtained digital signals are transmitted to an FPGA control chip in the signal control module; and therefore, demodulation can be completed.

The invention relates to a continuous wave ultrasonic tomography reconstruction method for correcting path tracking description. The method comprises the following steps of acquiring a boundary measurement value; performing linear projection based on the relative geometric position of the transmitting-receiving probe to construct a coefficient matrix; performing imaging iterative calculation by using a synchronous algebraic reconstruction method to obtain the distribution of the attenuation coefficients in the field domain; carrying out image filtering on a result obtained in the step 3 by using a Gaussian filtering function; performing image enhancement on the result of the step 4 by using histogram equalization mapping; carrying out inclusion contour extraction on the result of the step5 by using a differential curvature method, judging whether each pixel point of the image corresponds to an inclusion contour or not by calculating an energy entropy function, and enabling the energyentropy function to be larger when the inclusion contour corresponds to the pixel point; solving sound velocity distribution according to the inclusion contour extracted in the step 6; performing pathtracking calculation on the given transmitting ultrasonic probe and the receiving ultrasonic probe; constructing a new coefficient matrix projection attenuation measurement value Tau and a coefficient matrix R; ending the iteration.

The invention belongs to the field of computer-aided diagnosis, medical image processing, ultrasonic tomography and medical image analysis, and particularly discloses an anti-artifact feature extraction method based on an ultrasonic tomography reflection image convex target, which comprises the following steps of: (1) drawing an initial convex hull aiming at the convex target in a mode of selecting nodes; (2) calculating a geometric gravity center O1 of a target representation pixel; (3) updating and iterating the nodes; and (4) fitting and shaping the nodes, wherein a region correspondingly surrounded by a contour line obtained by connecting the shaped new nodes is a corresponding image of the extracted convex target. According to the method, details such as the overall process design and iteration conditions of the method are improved, so that the anti-artifact feature extraction method based on the ultrasonic tomography reflection image convex target can be accurate and effective in feature extraction for the reflection image of medical ultrasonic tomography equipment, and the extraction efficiency is improved. And meanwhile, the method has good robustness for artifacts and noise.

The invention relates to a device (110) for actuating and reading a group of ultrasound transducers (112) for ultrasound computer tomography, comprising a common substrate (116) having a first region(118) as an input channel (124) and a second region (120), which is electrically separated from the first region by means of n troughs, as an output channel (126); at least one high-voltage signal input (128) on the first region for receiving analog high-voltage signals; at least one high-voltage amplifier (132), which has high-voltage CMOS semiconductor components, on the first region (118) for receiving and amplifying the analog high-voltage signals; at least one group of ultrasound transducers (112) on the first region (118), wherein at least one of the ultrasound transducers (112) is designed to generate ultrasound signals during a transmission phase, and at least one of the ultrasound transducers (112) is designed to receive ultrasound measurement signals (140); at least one multiplexer (156) for combining ultrasound measurement signals (140) from at least two different ultrasound transducers (112) into a common measurement signal (148); at least one low-noise low-voltage pre-amplifier (152), which has CMOS semiconductor components, on the second region (120) for receiving the measurement signal (148); at least one output switch (150) on the second region (120) for canceling the application of the measurement signal (148) to the low-voltage pre-amplifier (152) at least during the transmission phase; and at least one low-voltage signal output (154) for transmitting a pre-amplified measurement signal (148) to an external control and analysis unit (212).

The invention belongs to the technical field of ultrasonic tomography in biomedical hyper-acoustics, and in particular to an ultrasonic CT sound velocity imaging method based on a deep residual network. The ultrasonic CT sound velocity imaging method based on the deep residual network comprises the following steps that S1, immersing a target detection object into a water tank provided with an annular ultrasonic transducer, S2, extracting signal first arrival points in two sets of original ultrasonic data respectively, corresponding subtraction is conducted, and a transit time difference graphis obtained; S3, constructing a deep residual error network model; s4, making training data and labels and inputting the training data and the labels into the network; training a model, according to the method, the projection data acquired by the acquisition equipment is reconstructed by utilizing the deep residual network in deep learning, so that the precision of a reconstruction result is improved, and the tedious steps of multiple iterations, regularization parameter adjustment and the like are avoided.

The invention belongs to the technical field of multiphase flow measurement, in particular relates to a three-dimensional variational method for multimode fusion of capacitance and ultrasonic tomography. The method comprises using a capacitance tomography method for a two-phase fluid to obtain a calculation result, and using the calculation result as a background field to establish a posterior state probability distribution function by combination of observation data; on the basis of assuming that the probability distribution functions of the observation data and the background field both obeyGaussian distribution, calculating the posterior state probability distribution function under the assumption conditions of the Gaussian distribution, using the three-dimensional variational method to obtain an objective function, and combining different weights of a background field error and an observation field error to obtain the objective function considering the weights; and using a conjugate gradient method to solve the objective function considering the weights to obtain an optimal state estimation value. The three-dimensional variational method is used for fusion of the capacitance and the ultrasonic tomography, and combines the advantages of the two tomographic techniques to improve the overall resolution of image reconstruction.

The invention discloses a mammary gland three-dimensional ultrasonic CT imaging system based on a high-density CMUT cylindrical array, and relates to the field of MEMS sensors. The system comprises aCMUT cylindrical array detector, a configuration circuit, a computer control system and a detection bed, wherein the CMUT cylindrical array detector is assembled by 512 rows of annular arrays, 2048 CMUT array elements are distributed on each row of annular arrays at equal intervals, and the CMUT array elements are manufactured by adopting a micromachining technology taking silicon-silicon bondingas a core. The CMUT cylindrical array surrounds the periphery of the breast for three-dimensional full-automatic electronic scanning, and has good cost and performance advantages in the field of ultrasonic imaging. The mammary gland three-dimensional ultrasonic CT imaging system is reasonable in design, can effectively improve the resolution of mammary gland ultrasonic tomography, shortens the detection time, has the characteristics of high sensitivity, high specificity and low cost, and has good practical application and popularization values.

The invention discloses a high-sensitivity photoacoustic/ultrasonic dual-mode imaging device and method based on a double-curvature linear array detector. The device comprises a photoacoustic excitation system, a double-curvature linear array detection system, a photoacoustic/ultrasonic dual-mode acquisition system, an ultrasonic and echo receiving system, a signal processing system, a control system and an image reconstruction and display system. For a photoacoustic imaging mode, the double-curvature linear array detector is used for receiving photoacoustic spherical waves, so that the photoacoustic spherical waves and the double-curvature linear array detector achieve a self-adaptive matching effect, and the time difference of a photoacoustic signal source in a focal region range of thedetector when reaching the same array element surface or different array elements is minimum, so that the sensitivity of the detector for receiving photoacoustic signals is improved. For an ultrasonicimaging mode, the same double-curvature linear array detector is adopted to carry out ultrasonic tomography in a synthetic aperture ultrasonic transmitting and full aperture ultrasonic receiving mode. Similarly, the included angle between the normal of an ultrasonic reflection wave surface and the normal of each array element is the smallest, and the sensitivity of the detector for receiving ultrasonic signals is further improved.

The invention discloses an omnibearing excitation method for an ultrasonic tomography system. The omnibearing excitation method is characterized in that omnibearing excitation signals are generated through an omnibearing excitation mode of a sensor group, and the omnibearing excitation signals are gathered in the center of a pipeline to form a virtual point source; then an ultrasonic signal is continually propagated along the original path, and at the moment, the distribution of the ultrasonic signal in the pipeline is equivalent to that of a high-power omnibearing ultrasonic signal sent by the virtual point source in the center of the pipeline; the ultrasonic signal is reflected when encountering a gas-liquid-phase boundary formed by bubbles and liquid in the pipeline when being propagated in the pipeline and is finally acquired by the ultrasonic sensor group; and the acquired signal is processed to obtain a high-quality detection result. By adoption of the technical scheme, the detection efficiency can be greatly improved, errors caused by channel switching of ultrasonic sensors are avoided, the quality of the detection result is improved, and the omnibearing excitation method is suitable for the environment having relatively high requirement on the detection efficiency and the imaging quality.

The invention discloses a breast support structure in a breast ultrasonic tomography system, which belongs to the technical field of medical treatment and comprises a support plate, a first shell is clamped on the lower surface of the support plate, the lower surface of the first shell is overlapped with the upper surface of a partition plate, and a second shell is arranged on the lower surface ofthe partition plate. According to the breast support structure in the breast ultrasonic tomography system, by arranging a sliding rod, the first shell, the second shell and the supporting plate, thebreast part of a patient can slide downwards under the extrusion of gas in the breast support structure, so that the breast support structure can adjust the angle of the breast during shooting, and the angle of the side surface of the whole breast is relatively large. Therefore, all parts of the breast cannot be missed, and all sections can be better imaged, the breast support structure can well assist in imaging and ensures the imaging effect of the breast ultrasound tomography system, and misdiagnosis caused by the poor imaging effect of the breast ultrasonic tomography system is not likelyto happen.

The invention provides a relative excitation method for an ultrasonic tomography system. Even-numbered piezoelectric ultrasonic sensors are uniformly distributed on the side wall of a metal pipeline in the circumferential direction, two piezoelectric ultrasonic sensors symmetrical about the axis of the metal pipeline are excited to send signals, and all other piezoelectric ultrasonic sensors are controlled to serve as receiving sensors, two signals excited simultaneously are synthesized in liquid, and the synthesized signals are received by the receiving sensors to serve as a group of component image signals; two other piezoelectric ultrasonic sensors symmetrical about the axis of the metal pipeline are simultaneously excited in sequence, and all other piezoelectric ultrasonic sensors arecontrolled to serve as receiving sensors to obtain imaging signals; image reconstruction is conduced through all the imaging signals. Accordingly, the intensity and amplitude of the ultrasonic excitation signals and the receiving signals in the ultrasonic tomography system are improved, the coverage range of ultrasound in the pipeline is enlarged, the two-phase flow detection quality and image reconstruction quality are improved, and the detection efficiency of the ultrasonic tomography system is improved.