57 results about "Shear wave elastography" patented technology

The invention discloses a method for intravascular ultrasound multi-slice shear wave elastography. The method comprises the following steps of recording an original ultrasound echo signal of a tissue to be detected; enabling an interventional ultrasound array probe to generate acoustic radiation force by virtue of a short-pulse signal controlled by a computer; emitting ultrasonic pulse beams for many times to accept and detect a propagation process of shear waves generated by the acoustic radiation force; analyzing the propagation speed of the shear waves in the tissue to be detected to obtain a wave speed distribution image of the shear waves in the tissue; performing wave speed mapping on the shear waves at each position in the tissue to be detected to obtain a quantitative elastic image of the intravascular tissue. The method has the advantages of real time performance, quantification, high speed, high resolution and the like; a multi-array element intravascular transducer array is used for performing vascular wall tissue elastic information quantitative analysis to excite and track the shear waves; the further popularization and application of intravascular elastography are favorably promoted, and the early diagnosis capability of people in cardiovascular diseases is enhanced.

The invention relates to a shear wave elasticity imaging method and device. The method includes the steps: acquiring ultrasonic image data of an interesting area of an object to be detected; acquiring a two-dimensional displacement vector of a shear wave of the interesting area based on the ultrasonic image data; processing the two-dimensional displacement vector to obtain shear wave elasticity imaging data of the interesting area to obtain an elasticity modulus of the interesting area. According to the method, two-dimensional displacement vectors of various moments after excitation of the shear wave are acquired by the aid of a two-dimensional displacement estimation method, the accuracy of an elasticity modulus of the object to be detected is furthest improved, the pathological detection accuracy of the object to be detected is improved, the method is applicable to the object to be detected with a regular shape and also applicable to the object to be detected (such as a blood vessel) with a regular shape caused by influence of peripheral tissues or diseases (such as plaques), elastic quantification can be achieved by the method based on a shear wave, and the method is high in applicability and wider in application range.

The invention discloses an elastic imaging method and system of shear waves. According to the method and system, speed information and attenuation information in the propagation process of the shear waves are measured and displayed, the technical problems are solved that in the prior art, the elastic imaging system of the shear waves is single in measured object so that organization information cannot be reflected comprehensively, the speed and attenuation information of the shear waves can be reflected, and then the method and system help to improve the reliability and comprehensiveness of shear wave detection. The elastic imaging method and system of the shear waves can be widely applied to various elastic imaging systems of the shear waves.

The invention relates to a shear wave elastic imaging method and device. The method comprises the steps of obtaining sampling data of a subject to be detected, wherein the sampling data comprises ultrasonic image data of a rectangular coordinate system; conducting coordinate transformation on the ultrasonic image data of the rectangular coordinate system so as to transforming the ultrasonic image data of the rectangular coordinate system into the ultrasonic image data of a polar coordinate system; conducting treatment on the ultrasonic image data of the polar coordinate system through a preset processing method so as to obtain shear wave elastic imaging used for representing an elasticity modulus of the subject to be detected; conducting visual processing on the shear wave elastic imaging so as to be used for the elasticity modulus of the subject to be detected. The shear wave elastic imaging of the subject to be detected is achieved based on coordinate change, and a shear wave of a long-axis tangent plane and the shear wave of a short-axis tangent plane are subjected to treatment so as to obtain an precise elastic quantitative of the subject to be detected, and to improve pathological detection precision of the subject to be detected.

The present invention relates to an ultrasound elastography system (10) for providing an elastography measurement result of an anatomical site (32) a corresponding method. The system (10) is configured to visualize a suitability for shear wave elastography of the region of interest (33) to the user within the ultrasound image (52) and / or to recommend an elastography acquisition plane (48, 50) for conducting shear wave elastography to the user. By this, proper selection of a location for an elastography measurement may be supported.

A method for performing shear wave elastography imaging of an observation field in a medium, the method including shear wave imaging steps to acquire sets of shear wave propagation parameters, the method further including a reliability indicator determining step during which a reliability indicator of the shear wave elastography imaging of the observation field is determined.

The invention relates to the technical field of medical ultrasound imaging, in particular to a quantitative shear wave elasticity imaging system. The quantitative ultrasonic elasticity imaging method and system provided by the invention are based on strain of sliding window linear fitting and shear wave velocity detection algorithm of two-dimensional linear fitting, the noise immunity is relatively high, and results are relatively reliable. Moreover, ultrasonic universe quantitative elasticity imaging is realized under the condition that an extra load of an ultrasonic front-end storage and transmission module is not increased, and the design difficulty and equipment cost of the ultrasonic quantitative elasticity imaging system are greatly reduced.

The present invention relates to an ultrasound elastography system (10) for providing a shear wave elastography measurement result of an anatomical site (32), wherein the ultrasound signal and image processing assembly (16) is further configured to determine a location (94, 95, 96) of a shear wave elastography measurement result within the three-dimensional image (98) of the anatomical site (32) and to display the location (94, 95, 96) of a shear wave elastography measurement result to the user. Further, a corresponding method is provided.

A shear wave elastography method for imaging an observation field in an anisotropic medium, including an initial ultrasonic acquisition step during which initial physical parameters are acquired in at least one region of interest; a spatial characterization step during which a set of spatial characteristics of the anisotropic medium is determined on the basis of the initial physical parameter; an excitation substep during which an shear wave is generated inside the anisotropic medium on the basis of the set of spatial characteristics; and an observation substep during which the propagation of the shear wave is observed simultaneously at a multitude of points in the observation field.

The invention provides a multi-shape plane shear wave composite imaging method based on Mach cone effects. Through regulating an acoustic radiation force to excite a probe to be quickly focused on different longitudinal depths of a tissue, a quickly-moving shear wave source is formed, coherent interference happens to shear waves generated by multiple wave sources due to Mach cone effects, a large-range shear wave plane moving to two sides is formed, the shear wave propagation condition is monitored in an ultra high-speed and ultrasonic mode, the shear wave speed is predicted, a tissue shear modulus is inverted, and a tissue elastic graph is generated; speeds or directions of shear wave sources are regulated, different shapes of shear wave planes are formed, a shear wave plane with a different shape generates a different sub elastic graph, and the sub elastic graphs are weighted and composited to form a final elastic graph. The tissue can be induced to generate large displacement, the imaging area is expanded, the shear wave elastic imaging robustness is enhanced, different shapes of shear waves are formed, the sub elastic graphs formed by the different shapes of shear waves are weighted, the imaging noise can be reduced, and the shear wave elastic imaging quality can be significantly improved.

The invention discloses an ultrasonic omics depth analysis method and system based on shear wave elastic imaging, and the method comprises the steps: obtaining a standardized shear wave elastic imagethrough the ultrasonic medical acoustic experience for different diseases; aiming at the corresponding disease model, utilizing the shear wave image to obtain corresponding elastic ultrasonic omics data of the organ; inputting the elastic ultrasonic omics data into a trained deep learning network, adjusting the connection weight, proportion convolution and pooling layer of neurons according to theelastic ultrasonic omics data to obtain adjusted elastic ultrasonic omics data, and obtaining the classification score of each lesion through deep learning; based on patient clinical information andexamination indexes, results are subjected to deep learning elastic classification scoring, and a deep analysis decision system is constructed through machine learning analysis. According to the invention, the repeatability of boundary data acquisition and the adaptability of image analysis can be improved, and a deep analysis decision system is constructed to improve the accuracy of an auxiliaryanalysis result.

The invention relates to a muscle disease assessment method and system and an electronic device. The muscle disease assessment method includes the steps: a driving passive motion of a subject by external driving, and acquiring a motion angle of the subject; b acquiring dynamic change of detected skeletal muscle without the motion angle by the aid of an ultrasonic shear wave elasticity imaging technique, and extracting elasticity measurement data of the dynamic change; c extracting a corresponding relationship between elasticity modulus of the detected skeletal muscle and a joint angle from theelasticity measurement data, and taking the corresponding relationship between the elasticity modulus and the joint angle as characteristics to make a data set; d building a probabilistic neural network model, inputting the data set into a probabilistic neural network to perform training, and outputting a muscle disease of the subject and categories of the muscle disease by the probabilistic neural network. According to the method, by the aid of the artificial intelligence neural network, classification results are more reliable, generalization ability is better, and a new method is providedfor assessment of muscle diseases.

The embodiment of the application 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 transmit ultrasonic waves to 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 when the tested tissue is in the first state based on the ultrasonic echo signal; acquiring a comparison image of the tested tissue when the tested tissueis 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 when the tested tissue is in the second state according to the reference image and the comparison image; and controlling display of prompt information corresponding to the pressure state. According to the shear wave elasticity imaging method, the ultrasonic imaging system and the computer readable storage medium, 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.

Ultrasound motion-estimation includes issuing multiple ultrasound pulses, spaced apart from each other in a propagation direction of a shear wave, to track axial motion caused by the wave. The wave has been induced by an axially-directed push. Based on the motion, autocorrelation is used to estimate an axial displacement. The estimate is used as a starting point (234) in a time-domain based motion tracking algorithm for modifying the estimate so as to yield a modified displacement. The modification can constitute an improvement upon the estimate. The issuing may correspondingly occur from a number of acoustic windows, multiple ultrasound imaging probes imaging respectively via the windows. The autocorrelation, and algorithm, operate specifically on the imaging acquired via the pulses used in tracking the motion caused by the wave that was induced by the push, the push being a single push. The algorithm may involve cross-correlation over a search area incrementally increased subject to an image matching criterion (S358).

Described here are systems and methods for estimating shear wave velocity from data acquired with a shear wave elastography system. More particularly, the systems and methods described here implement a spatiotemporal time-to-peak algorithm that searches for the times at which shear wave motion is at a maximum while also searching for the lateral locations at which shear wave motion is at a maximum. Motion can include displacement, velocity, or acceleration caused by propagating shear waves. A fitting procedure (e.g., a linear fit) is performed on a combined set of these temporal peaks and spatial peaks to estimate the shear wave velocity, from which mechanical properties can be computed. Motion amplitude thresholding can also be used to increase the number of points for the fitting.

Ultrasonic elasticity detection equipment and a shear wave elasticity imaging method are disclosed. An ultrasound probe (101) is controlled to emit ultrasound to the region of interest of the target tissue (108) for a first time period (T1) to detect the first shear wave passing through the region of interest, and the echo of the ultrasonic wave is received to obtain a first collected sample (step11); a second time period (T2) is obtained according to the first collected sample (step 13); the ultrasound probe (101) is controlled to emit ultrasound to the region of interest of the target tissue (108) for a second time period (T2) to detect the second shear wave passing through the region of interest, and the echo of the ultrasonic wave is received to obtain a second collected sample (step15); and the elasticity parameter of the region of interest is calculated based on multiple data in the first collected sample and the second collected sample (step 18). The method of automatically optimizing the time of collecting multiple samples during the sample collection process can be adopted to improve the collection efficiency of ultrasonic elasticity detection and further improve the validity of the shear wave elasticity imaging results.

The invention discloses a shear wave elastic imaging method and a device, and the method comprises the following steps of: a target value of a target parameter is obtained; the target parameter is a parameter for shear wave imaging of a region of interest; the target value is a value matching the tissue characteristics of the region of interest; the current value of the target parameter is changedto be the target value; and, based on the target value of the target parameter, shear wave elastic imaging is performed on the region of interest. Through the embodiment of the present application, the image result obtained by shear wave image the region of interest according to the target value is more reliable.

The invention provides a targeted shear wave elastography detection system and a detection method thereof. Magnetic particles are injected into a test body, and the test body is placed between an ultrasonic transducer and an excitation coil; the function generator transmits a square wave to the power amplifier and transmits a trigger signal to the ultrasonic imaging system at the same time; the power amplifier amplifies the square wave, the excitation coil generates a pulsed magnetic field acting on the test body, and the magnetic field drives the magnetic particles in the test body to vibrate; the ultrasonic imaging system triggers the ultrasonic transducer to work, and the ultrasonic transducer receives the reflection pulse to form a radio frequency echo signal; the ultrasonic imaging system collects a radio frequency echo signal from the ultrasonic transducer, demodulates and images the radio frequency echo signal, and calculates to obtain a shear wave speed c and a shear modulus G.According to the invention, magnetic particles are used as probes for marking, so that the penetrability of excitation signals in a complex environment can be effectively improved, and the detectionresult of shear wave elastic imaging detection is accurate and reliable.

A quantitative shear wave elasticity imaging method and system relates to the technical field of medical ultrasound imaging. The provided ultrasound quantitative elasticity imaging method and system are based on a sliding window linear fitting strain and use a two-dimensional linear fitting shear wave velocity detection algorithm, and thus, the anti-noise capability is stronger, and the result is more reliable. Moreover, where the load of an ultrasonic front-end storage and transmission module is not additionally in-creased, global ultrasonic quantitative elasticity imaging is realized, thereby significantly reducing the design difficulty of the ultrasound quantitative elasticity imaging system and the device cost.

A method for generating a source point of shear waves for shear-wave elasticity imaging (SWEI) of an object. The method includes placing an ultrasound transducer on a surface of the object, vibrating the ultrasound transducer along a vibration axis utilizing a vibrator when the ultrasound transducer is placed on the surface of the object, and generating a shear wave in the source point by applying an acoustic radiation force on the source point. Applying the acoustic radiation force includes focusing an ultrasonic beam of the ultrasound transducer at a first focus point. The first focus point is located at the source point. The acoustic radiation force is applied simultaneously with vibrating the ultrasound transducer.

Methods for processing data acquired using ultrasound elastography, in which shear waves are generated in a subject using continuous vibration of the ultrasound transducer, are described. The described methods can effectively separate shear wave signals from signals corresponding to residual motion artifacts associated with vibration of the ultrasound transducer. The systems and methods described here also provide for real-time visualization of shear waves propagating in the subject.

The invention discloses a shear wave elastic imaging method and system. The method comprises the following steps: obtaining sound pressure components p of ultrasonic waves emitted by an ultrasonic probe at all focus positions, determining the number of needed focuses, the focus positions and sound pressure distribution according to the size of a target area expected for shear wave elastic imaging, wherein the number of the focuses is at least two; acquiring sound pressure h generated by each array element in the ultrasonic probe at each focus position; acquiring a sound pressure weight w; and acquiring the intensity q of each array element according to the sound pressure component p at each focus position, the sound pressure h generated by each array element at each focus position and the sound pressure weight w. When the intensity q of each array element meets a preset condition, the ultrasonic probe is controlled to carry out shear wave elastic imaging according to the intensity q of each array element, according to the method and the system provided by the invention, the ultrasonic intensity at the plurality of focus positions is controlled to be uniformly distributed, and the shear wave elastic imaging with good quality is generated in the to-be-detected tissue.

Ultrasound motion-estimation includes issuing multiple ultrasound pulses, spaced apart from each other in a propagation direction of a shear wave, to track axial motion caused by the wave. The wave has been induced by an axially-directed push. Based on the motion, autocorrelation is used to estimate an axial displacement. The estimate is used as a starting point (234) in a time-domain based motion tracking algorithm for modifying the estimate so as to yield a modified displacement. The modification can constitute an improvement upon the estimate. The issuing may correspondingly occur from a number of acoustic windows, multiple ultrasound imaging probes imaging respectively via the windows. The autocorrelation, and algorithm, operate specifically on the imaging acquired via the pulses used in tracking the motion caused by the wave that was induced by the push, the push being a single push. The algorithm may involve cross-correlation over a search area incrementally increased subject to an image matching criterion (S358).

In a diagnostic scanner for shear wave elastography imaging an ultrasound exposure safety processoris is configured for spatially relating respective definitions of an imaging zone (324), and an extended dead-tissue zone (312) that includes both a dead-tissue zone and a surrounding margin. Based on whether a push pulse focus (344, 348, 352) is to be within the extended dead-tissue zone, the processor automatically decides as to a level of acoustic power with which the pulse is to be produced. If it is to be within, the pulse may be produced with a mechanical index, a thermal index, and / or a spatial-peak-temporal-average intensity that exceeds respectively 1.9, 6.0 and 720 milliwatts per square centimeter. The imaging zone may be definable interactively so as to dynamically trigger the deciding and the producing, with optimal push pulse settings being dynamically derived automatically, without the need for user intervention. A display of multiple push pulse sites (344-352) allows user manipulation of spatial definition indicia (336) to dynamically control displacement tracking.

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.

A method of performing shear wave elastography in tissue includes transmitting successively a series of ultrasound push pulses in the tissue in a region of interest (ROI) using a single array transducer. The acoustic intensities of the push pulses are sinusoidally modulated with a modulation frequency, Each push pulse generates an acoustic radiation force that pushes the tissue and creates an individual shear wave propagating through the tissue. The amplitudes of the shear waves, and therefore, the displacements produced by the push pulses, are positively proportionally to the intensities of the push pulses. The successively created individual shear waves with different amplitudes sum together to form a continuous, harmonic summed shear wave with a single frequency the same as the modulation frequency of the push pulses.