7 results about "Strain imaging" patented technology

The application discloses a dual-mode optical coherence elastography device and method. The device comprises an excitation unit for generating an acoustic field; an imaging unit which is an optical coherence tomography system and is used for detecting the vibration of a sample, i.e. a strain response and an elastic wave response; and a coupling unit which has an acoustic reflection surface with a middle through hole and is used for reflecting the acoustic field generated by the excitation unit so that the coupling between a probe light beam emitted by the imaging unit and the acoustic field emitted by the excitation unit is on the same side of the sample. The application uses a multi-beam optical coherence tomography system to emit two or more probe light beams for dual-mode elastography, and can simultaneously obtain high-resolution strain information and quantitative elastic information of the sample, thereby solving the problem that the prior art cannot simultaneously perform strain imaging and elastic wave imaging.

A system, apparatus, method, algorithm and / or device (collectively, “system”) for non-contact or contactless ultrasound viscoelastic spectroscopy measures the viscoelastic properties of soft matter through exerting modulated ultrasound pressure waves, so called stress signals and measuring the material deformation, so called strain imaging, over a wide range of frequencies, and may be applied to various fields including but not limited to material science, polymer designing, tissue engineering, cancer drug development and / or biological tissue assessment for disease diagnosis and prognosis. By measuring the elastic and viscous moduli, the phase difference between them, and Poisson's ratio over a wide range of frequencies, this allows for non-destructive tests on soft matter such as biological tissue, by ultrasound probes.

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.

According to the ultrasonic strain imaging method and the ultrasonic equipment, in a strain elasticity imaging mode, ultrasonic scanning is carried out on a cardiac muscle tissue area, multi-frame ultrasonic front-end data collected for the cardiac muscle tissue area are stored, strain calculation is carried out on the stored multi-frame ultrasonic front-end data, and a strain result is obtained and displayed; as the strain result is obtained by performing strain calculation based on the ultrasonic front-end data, compared with strain calculation based on a B image, the strain calculation based on the B image does not depend on the imaging quality of the B image, a series of post-processing steps are not needed, and the data quantity is reduced, in addition, the ultrasonic front-end data further comprise phase information, and the phase information is more accurate. The strain result obtained through strain calculation based on the ultrasonic front-end data is more accurate, robust and sensitive, the spatial resolution is higher, and the performance of strain elastography is remarkably improved.

Methods and apparatuses for multiple degree-of-freedom fatigue testing of a specimen. The apparatus includes a first platform, a second platform, a plurality of actuator assemblies, a load cell, a mounting plate, a specimen support, a direct-strain imaging system, and a local sense and control system. Each actuator assembly includes a servo-control, a position encoder, and a piston that is constructed to move in a linear direction in accordance with the servo-control. Each piston is rotatably connected to the second platform. The load cell is connected to the second platform and constructed to output force measurements in three orthogonal directions and torque measurements about the three orthogonal directions. The mounting plate is constructed to hold a portion a specimen. The specimen support is constructed to hold another portion of the specimen. The direct-strain-imaging system includes a camera that is constructed to record a plurality of images of the specimen during fatigue testing. The local sense and control system constructed to receive: a loading specification, the force measurements and torque measurements from the load cell, and position information from each position encoder, and output control commands to each servo-control of the plurality of actuator assemblies based on the received loading specification. The control commands are updated in time in accordance with the position information from each position encoder and the force measurements and torque measurements from the load cell.

The invention relates to the technical field of biomechanical research, and discloses a variable-diameter cornea biomechanical research system and a use method. The system comprises a pressure chamber, a rapid perfusion system, a precise pressurization system and a cornea full-field strain imaging system, and is composed of a mechanical sensor, a peristaltic pump, a pressure cavity, a reducing end cover, a cornea clamping ring and the like. The method comprises the following steps: S100, firstly, according to the size of a taken cornea sample, rotating an adjusting knob on a reducing end cover to enable the diameter of the adjusting knob to accord with the size of the cornea sample; and S200, the cornea and sclera area is placed between the variable-diameter end cover and the cornea clamping ring, and meanwhile, a sealing ring is placed on the periphery of the cornea and sclera. According to the invention, the adjustable reducing end cover is designed to meet different cornea requirements; the cornea clamping ring improves the fixing effect and adapts to the extreme environment; high-quality speckle patterns are obtained based on the projection speckle DIC technology, and the method is suitable for a high-temperature acid-base environment; advantage complementation is achieved through double-pump perfusion; and the BPT tube widens the experimental environment range. The invention further provides a using method of the system, and an efficient, accurate and high-adaptability solution is provided for cornea biomechanical research.