64 results about "Ultrasonic Tomography" patented technology

The invention is a differential 3D Quantitative-Imaging Ultrasonic Tomography method for inspecting a layered system that is comprised of a heterogeneous object embedded in a volume of space that comprises layers having an acoustic impedance gradient between the layers providing non-linear beams travels. A transducer grid is attached to the surface of the layered system in a unilateral manner. By sequentially changing the distance between transmitter and receiver the fastest travel times of the ultrasonic oscillations are measured. A differential approach provides from the data the longitudinal wave velocities values for each elementary volume that make up an inspected volume. These values are used to construct two and three-dimensional maps of the longitudinal wave velocity values distribution in the inspected volume and the porosity values distribution in the heterogeneous object. By applying statistical treatment to the obtained data the longitudinal wave velocity in the inspected material matrix part is estimated.

Elastic data such as the distortion and elastic moulds of a tissue of a subject (1) at measurement points of a cross-sectional portion of the subject is determined according to ultrasonic tomography data measured by applying a pressure to the tissue of the subject (1). An elastic image of the cross-sectional portion is created from the elastic data and displayed. The distribution of the elastic data such as the distortion and elastic modulus of the region of interest ROI set in the elastic image is displayed with a histogram. Hence, in addition to the information on the elasticity of the tissue graded with hue of brightness, new quantitative information reflecting the tissue properties is provided to support examination of a tissue.

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 discloses a gridding ultrasonic tomography detection method for defects of shaft workpieces. The method comprises the following steps: meshing an end surface area at one end of a workpiece; adopting a grid center as an ultrasonic probe sampling point, adopting an ultrasonic pulse echo method is used for sequentially collecting time domain signals of all sampling points and then converting the time domain signals into spatial depth signals, echo amplitudes corresponding to all depths are obtained, the position where defect echoes are located is clearly located, and detection of internal defects of shaft workpieces is achieved. According to the invention, acoustic beam diffusivity is also considered; superposing all reflection signal amplitudes which can be diffused to a certain position; echo amplitudes of cross sections at different depths in the workpiece are reconstructed by adopting amplitude data after superposition processing, and information of the cross sections inthe workpiece is displayed by tomography, so that the depth and two-dimensional distribution of defects are effectively identified, and the defect detection rate is greatly improved. According to themethod, a complex scanning array does not need to be arranged, comprehensive, visual and effective detection and positioning imaging of the internal defects of the shaft workpiece are achieved. The detection operation difficulty is reduced, and the operation efficiency, the detection rate and the reliability of a detection result are improved.

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.

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 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 embodiments of the present invention disclose an ultrasonic tomography method based on Bayesian regularization, and relates to the technical field of non-destructive detection. The ultrasonic tomography method can improve the calculation speed and the calculation precision of the inverse problem of ultrasonic tomography, and comprises: arranging an ultrasonic transmitter and a receiver, carrying out mesh dividing on a cross section to be detected, and obtaining ultrasonic tomography data; establishing the posterior probability density function pi (X, [sigma]2, [lambda]2|b) of a solution vector X under the support of an ultrasonic propagation time measurement value vector through layered Bayesian modeling; maximizing the posterior probability density function pi (X, [sigma]2, [lambda]2|b) of the solution vector X, and establishing an optimal condition equation set; solving the solution vector X, the [sigma]2 and the [lambda]2 by using a sequential Bayesian learning iterative algorithm, and adaptively determining an optimal regularization parameter; and obtaining the ultrasonic velocity value according to the solved solution vector X, and displaying in an image form. The ultrasonic tomography method of the present invention is suitable for the ultrasonic tomography of solids.

The invention belongs to the field of ultrasonic tomography, and discloses an ultrasonic tomography three-dimensional imaging method and system based on spiral scanning. The method comprises the following steps: (1) collecting original data, namely, while a probe keeps uniform linear motion, switching a transmitting array element to enable the change track of the position of an equivalent transmitting array element along with time in a three-dimensional space to be in a spiral shape or a partially spiral shape, and receiving echo data; (2) carrying out data preprocessing; (3) calculating the coordinates of each equivalent transmitting array element; (4) calculating the coordinates of imaging focus points; (5) performing synthetic aperture focusing on each imaging focus point; and (6) carrying out data post-processing. The imaging method principle, the overall process design and the like are improved, volume data containing tissue continuous layer information is obtained in a spiral scanning mode, it is proposed for the first time that the synthetic aperture focusing technology is applied to the three-dimensional space, the resolution between layers can be improved, the scanning time is shortened, and the imaging quality of the system can be improved.

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 the technical field of medical equipment, and particularly discloses a three-dimensional ultrasonic tomography data acquisition device based on a sitting type array and a linear array. The device comprises a soft sleeve, the linear array, a sliding rod, a control module and a sealing groove, and the soft sleeve sleeves the mammary gland, so that the mammary gland is not greatly deformed due to body position change; linear array combined ultrasonic transducer arrays are distributed around the mammary gland and are connected with the sliding rod; the control module controls the linear array to move from nipples to mammary roots so as to acquire each group of two-dimensional measurement data for reconstructing a three-dimensional image; the sealing groove surrounds the mammary gland, the linear array and the sliding rod, and the lower end of the sealing groove clings to the skin under the mammary gland; and a coupling agent is packed in the inner side gap of the sealing groove and a gap between the soft sleeve and the mammary gland. The three-dimensional ultrasonic tomography data acquisition device can realize data acquisition during sitting or standing, overcomes the defects of high annular array processing difficulty, high cost, inaccurate matching between array analog position and digital coordinates and the like, and has an actual application value for breast cancer screening based on ultrasonic tomography.

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 provides an ultrasonic tomography method and device based on space-time array super-resolution inversion imaging. Time delay and attenuation information of ultrasonic propagation are utilized for fast imaging, a method of one-time program-controlled scanning and background on-demand chromatography is adopted, and an ultrasonic probe is driven by a mechanical automatic scanning deviceto use a spatial multi-array to acquire point region reflection waveform data of all scanning points on different time slots according to a certain path, and then reflection strength in the depth ofeach scanning point is subjected to inversion calculation according to the principle of super-resolution imaging, and three-dimensional global information is obtained. A user performs chromatography on demand, and obtains the local shape and cross section from the three-dimensional global information to obtain local detailed imaging. The ultrasonic tomography device can obtain high-resolution imaging without scanning global 360 degrees in different directions. The program-controlled fixed path scanning is used, manpower is liberated, and standardized detection data is easily generated; no damage is caused, and high security is achieved; and low environmental requirements are achieved, equipment is compact, the price is low, and popularization and use are easy.

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 discloses a method for screening open neural tube defects (ONTD) of fetuses through maternal serum alpha-fetoprotein heteroplasmons L2 and L3 in a second trimester. The method comprisesthe following steps: (1) forming a case group by multiple pregnant women with fetuses determined as ONTD fetuses through ultrasonic tomography, and randomly forming a control group through multiple pregnant women with fetuses who grow normally; (2) detecting the levels of AFP-L2 and AFP-L3 of serums of two groups of the pregnant women by virtue of ELISA, carrying out statistical treatment on the correlation between the levels of AFP-L2 and AFP-L3 of the serums of the pregnant women in the second trimester and the ONTD of the fetuses, and analyzing the screening efficiency by virtue of different constructed risk calculation models; and (3) calculating the optimal critical values and areas under the curve of AFP-L2 and AFP-L, for screening the ONTD fetuses, of the serums of the pregnant women. The method has the beneficial effects that AFP-L2 and AFP-L of the serums of the pregnant women in the second trimester have relatively high sensitivity and specificity to the screening of the ONTDfetuses and are relatively good markers for screening the ONTD, and the screening efficiency of the risk calculation model constructed by virtue of AFP-L2 and AFP-L3 is better than that of an MoM value respectively corresponding to AFP, AFP-L2 and AFP-L3.

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.

A method for detecting defects of a grouting material structure between a fabricated pier and a bearing platform relates to the technical field of bridge structure detection, and comprises the following steps of: (1) laying an embedded strain gauge; (2) obtaining data of the strain gauge; (3) analyzing the data of the strain gauge, and determining a key detection area 1; (4) determining possible structural defect positions in the non-key detection area by adopting an elastic wave vertical reflection method, and determining a key detection area 2; (5) detecting the key detection area by adopting an ultrasonic tomography technology to obtain detection data; and (6) inverting the obtained data by using an algorithm to obtain the condition of the detected structure. By using the detection method provided by the invention, whether the grouting material structure between the fabricated pier and the bearing platform is stable or not can be known quickly and reliably, and the later safety construction and the reliability of the bridge are ensured.