17 results about "Shear wave imaging" patented technology

The present disclosure describes ultrasound systems and methods configured to interrogate the stiffness and / or elasticity of a target tissue through shear wave imaging. The systems can be configured to transmit multiple push pulses at different focal depths in the target tissue in a strobe-like fashion. The rapidly transmitted push pulses can generate constructive interference to form shear waves of a composite shear wave. An example system can include a beamformer configured to transmit parameters of a push pulse to a transducer array while receiving new parameters of a push pulse from a controller. The dual transmission and reception of parameters of different push pulses reconfigures the beamformer without interrupting push pulse transmission, thereby minimizing the delay between successive push pulses. The push pulses transmitted according to the disclosed methods can generate a composite shear wave configured to interrogate the tissue with enhanced sensitivity over a wide range of depths.

For shear wave imaging with ultrasound, the apparent pulse repetition frequency is increased by combining displacements from different lateral locations. Different combinations based on different shear wave velocities and corresponding time shifts and / or attenuations and corresponding scalings are tested to find a smooth displacement profile for the combination. Once the smooth displacement profile is found, the corresponding shear wave velocity is estimated or determined.

For shear wave imaging with ultrasound, the apparent pulse repetition frequency is increased by combining displacements from different lateral locations. Different combinations based on different shear wave velocities and corresponding time shifts and / or attenuations and corresponding scalings are tested to find a smooth displacement profile for the combination. Once the smooth displacement profile is found, the corresponding shear wave velocity is estimated or determined.

The utility model discloses a selection circuit, an emission power supply and ultrasonic equipment, and solves the problem of different emission current demands in different imaging modes. According to the scheme, in the shear wave imaging mode, the resistance value is small when the shear wave path is conducted, so that large transient wave beam energy is provided for the transmitting circuit; in a conventional imaging mode, such as a conventional PW or Color mode, the resistance value of a conventional path is large, at the moment, relatively small energy is provided for the transmitting circuit, and the transmitting requirement in the conventional imaging mode can be met. In conclusion, through switching of the shear wave path and the conventional path, efficient transmission of appropriate emission current and emission energy in different imaging modes is achieved, the current requirements in the shear wave imaging mode and the conventional imaging mode are met at the same time, and the adaptability and performance of the switching power supply are improved.

A borehole sonic logging tool and method for imaging. The borehole sonic logging tool may comprise a transmitter configured to transmit a sonic waveform into a formation, wherein the transmitter is a dipole, and a receiver configured to record a reflected wave as waveform data, wherein the receiver is a quadrupole. A method may comprise disposing a downhole tool into a borehole, selecting a frequency range for the transmitter to a horizontally-polarized shear formation body wave, broadcasting the sonic waveform as the horizontally-polarized shear formation body wave into the formation penetrated by the borehole with the transmitter, recording a reflected wave on the receiver as waveform data, wherein the reflected wave is the horizontally-polarized shear formation body wave reflected from a reflector, and processing the waveform data with an information handling system.

The embodiment of the invention discloses a shear wave elasticity imaging method and system and a computer readable storage medium. The method comprises the following steps: controlling a probe to emit ultrasonic waves to a tested tissue; receiving an ultrasonic echo returned by the tested tissue, and controlling the probe to convert the ultrasonic echo to obtain an ultrasonic echo signal; acquiring a reference image of the tested tissue in the first state based on the ultrasonic echo signal; acquiring a contrast image of the tested tissue in a second state based on the ultrasonic echo signal in a shear wave imaging mode; determining the pressure state of the tested tissue relative to the probe in the second state according to the reference image and the contrast image; and controlling to display prompt information corresponding to the pressure state. According to the embodiment of the invention, the pressure state between the probe and the tested tissue is determined through the ultrasonic image, and the corresponding prompt information is output, so that a user can conveniently determine the accuracy of the obtained elasticity information of the tested tissue according to the prompt information.

For shear wave imaging using ultrasound, the apparent pulse repetition frequency is increased by combining (14) displacements from different transverse positions. Different combinations of different shear wave velocities and corresponding time offsets and / or attenuations, as well as corresponding scaling, are tested to find a smooth displacement distribution for the combination. Once a smooth displacement distribution is found, the corresponding shear wave velocity is estimated or determined (18).

The invention discloses ultrasonic equipment and a heart evaluation device, and is applied to the technical field of ultrasound. A transmitting and receiving control circuit; the processor is used for performing a strain imaging mode on a first cardiac muscle tissue of the target heart so as to obtain at least one strain elastic parameter of the first cardiac muscle tissue in a cardiac cycle; performing a shear wave imaging mode on a second cardiac muscle tissue of the target heart to obtain a shear wave elastic parameter of the second cardiac muscle tissue; and obtaining a heart performance quantitative evaluation result according to the at least one strain elastic parameter and the shear wave elastic parameter, wherein the heart performance quantitative evaluation result is used for representing the contraction performance and / or diastolic performance of the target heart. Quantitative evaluation is comprehensively performed from the deformation dimension and the elastic dimension of the myocardial tissue, so that the contraction performance and the relaxation performance of the heart are comprehensively and intuitively evaluated.

The present application discloses a shear wave image generation method, ultrasonic equipment and device. The present application utilizes acoustic radiation force or low-frequency vibration to excite the target part to generate shear waves, detects the shear waves on the shear wave propagation path, and obtains the detection data of the shear waves; determines the particle vibration velocities corresponding to each particle of the shear wave at different times; for the particle vibration velocities corresponding to any particle at different times, performs filtering processing on the particle vibration velocities corresponding to the particles at different times in multiple directions, obtains the reference particle vibration velocities corresponding to each particle vibration velocity in each direction, and obtains the shear wave velocity corresponding to each particle in any direction; and generates a shear wave image based on the preset ultrasonic black and white image and the shear wave velocity corresponding to each particle in each direction. In this way, the directionality and accuracy of the shear wave propagation velocity can be improved, providing a more comprehensive shear wave information.

The invention discloses a vascular wall elasticity imaging method and ultrasonic imaging equipment, and the method comprises the steps: transmitting excitation waves and detection waves for a period of time to target vascular tissue in a multiplex imaging mode, and receiving ultrasonic echoes obtained after the detection waves are reflected by the target vascular tissue, so as to obtain multiple frames of ultrasonic data containing at least one cardiac cycle; performing shear wave imaging and pulse wave calculation on the multiple frames of ultrasonic data to obtain a shear wave elastic image and a pulse wave conduction velocity, and at least displaying the shear wave elastic image and the pulse wave conduction velocity at the same time; therefore, according to the invention, the pulse wave technology and the shear wave elasticity imaging technology are utilized to carry out vascular tissue ultrasonic imaging together, and the pulse wave measurement result and the shear wave measurement result are output at the same time, so that the vascular elasticity is evaluated more accurately.

The present invention discloses a method, device, equipment and storage medium for determining the excitation frequency of shear waves. In this solution, after determining the excitation focus within the shear wave imaging area, the optimal target excitation frequency of the current probe at the excitation focus can be determined based on the bandwidth curve function, directivity function of the current probe, and the attenuation coefficient and absorption coefficient of the excited tissue, thereby increasing the acoustic radiation force and shear wave amplitude at the excitation focus, and further increasing the signal-to-noise ratio of the shear wave, ensuring the optimal shear wave excitation effect at the excitation focus.

The embodiment of the invention discloses a shear wave measurement result display method and ultrasonic imaging equipment. The ultrasonic imaging device obtains shear wave data of a region of interest of a measured object, tissue motion information corresponding to at least two different shear wave frequencies is extracted from the shear wave data, shear wave measured values of the tissue motion information corresponding to selected frequencies are mapped into shear wave images, and the shear wave images corresponding to the selected frequencies are displayed. And when the operation of switching the selected frequency to the target frequency by the user is received, switching and displaying the shear wave image corresponding to the selected frequency to the shear wave image corresponding to the target frequency. A doctor can randomly switch different shear wave frequencies to observe shear wave measurement results of tissues under different shear wave frequencies, so that the doctor can conveniently observe physiological states and health conditions of the tissues from multiple dimensions, and the doctor can more conveniently make accurate diagnosis by integrating the shear wave measurement results of multiple shear wave frequencies; and the accuracy of tissue ultrasonic examination is improved.

A method for enhancing shear wave imaging based on an acoustic vortex includes the following steps. An ultrasonic beam in an acoustic vortex waveform is transmitted to a target tissue through an ultrasonic transducer. An original wave source generated by the ultrasonic beam is sensed through the target tissue. The original wave source forms a shear wave source in a unit periodicity. The at least one shear wave source responds to generate a constructive interference shear wave source. A shear wave is generated through the constructive interference shear wave source. Tissue characteristic information is obtained based on the shear wave imaging. An image of a displacement generated by the shear wave is drawn through the tissue characteristic information.

The present invention proposes an ultrasonic phased array shear wave sparse imaging method based on nonlinear beamforming, which relates to the field of ultrasonic nondestructive testing technology. The method comprises the following steps: S1, calculating the coordinates of ultrasonic phased array elements based on ultrasonic phased array probe parameters and wedge parameters; S2, randomly selecting M effective array elements from the N array elements of the ultrasonic phased array, discretely gridding the target area, calculating the acoustic field radiation energy of each effective array element to each grid, then superimposing the acoustic field radiation energies to calculate the synthetic acoustic field radiation energy, and calculating the average value based on the synthetic acoustic field radiation energy. The sparse array distribution with the largest average value is taken as the ultrasonic sparse array distribution; S3, collecting the full matrix signal of the ultrasonic sparse array of the test object, and performing nonlinear wavenumber shaping processing on the target area for visual reconstruction. This method, based on a nonlinear beamforming algorithm for shear wave imaging, ensures high-quality imaging while significantly reducing calculation time and improving imaging efficiency.

The invention discloses a converted wave imaging trace gather selection and arrangement method and device, electronic equipment and a storage medium, and relates to the technical field of converted shear wave seismic data processing. Setting the number of the imaging measuring line, the number of the imaging point and the distance between the excitation point and the receiving point in the trace head of each seismic trace according to the definition of an observation system; s2, grouping and numbering all the collected single shot records; s3, according to the imaging range, taking the imaging measuring line in the head of each seismic trace as a selection parameter, dividing each single-shot data group into a plurality of independent data volumes again according to a preset fixed interval, and marking imaging measuring line numbers; s4, selecting and arranging the independent data volumes with the same imaging measuring line number in sequence; and S5, outputting to obtain a final converted shear wave imaging gather. According to the method, the efficiency and effectiveness of converted shear wave data processing are remarkably improved, and the problem of relatively low time efficiency of an existing converted shear wave seismic data processing technology is solved.

The invention provides an image optimization method for acoustic radiation force elastography. The method comprises the following steps: S3, judging a high-hardness region connected domain image of a shear wave image; s4, performing automatic quantitative calculation on the connected domain image of the high-hardness region; s5, judging whether the image information is missing or not based on an automatic quantitative calculation result; if not, executing S6; if yes, executing S7 to S13; s6, outputting a current shear wave image; s7, acquiring an image information missing area; s8, caching the shear wave information of the current shear wave image; s9, reducing the real-time imaging frame rate of shear wave imaging; s10, recalculating an acoustic radiation force excitation position; s11, based on the recalculated real-time imaging frame rate after the acoustic radiation force excitation position is reduced, returning to execute S1 to S2 again, and obtaining a new current shear wave image; s12, superposing the cached shear wave information after the imaging frame rate is reduced with a new current shear wave image; and S13, outputting the superposed image.

The present disclosure includes ultrasound systems and methods for smart shear wave elastography in anisotropic tissue. An example method may include identifying muscle fiber structures from a 3D ultrasound image dataset. The method may include providing a representation of at least one identified muscle fiber structure relative to a surface of a transducer. The method may include selecting at least one of the identified muscle fiber structures. The method may include determining a target measurement plane based on an orientation of the selected muscle fiber structure. The method may also include transmitting ultrasound pulses in accordance with a sequence configured to perform shear wave imaging in the target measurement plane.