32results about How to "Avoid Motion Artifacts" patented technology

The present invention proposes a novel mammary gland-specific CT device based on a pulsed X-ray source and its control method, which is applied in the technical field of CT scanners. An X-ray tube and a flat-panel detector are provided, the X-ray tube is a grid-controlled X-ray tube, and a high-voltage generator is connected to the grid-controlled X-ray tube to control its pulse exposure; The X-ray scanning cup is arranged above the rotation center of the turntable, and the X-ray tube and the flat panel detector are separated on both sides of the scanning cup. The present invention has a short exposure time and effectively avoids the occurrence of motion artifacts; its duty cycle can be adjusted at will according to requirements, while reducing the radiation dose, it also reduces the heat dissipation pressure of the anode of the X-ray tube and prolongs the life of the X-ray tube. service life.

The invention discloses a method of noninvasive high-precision vessel wall elastography. The method comprises the following steps: acquiring the radio-frequency data or video data of B-mode ultrasonic imaging of a vessel wall longitudinal section; making an off-line analysis on the acquired radio-frequency data or video data to obtain the displacement field of each frame of radio-frequency data or video data; filtering the displacement fields of the radio-frequency data or video data with an FIR two-dimensional difference filter to obtaining strain components on the longitudinal section, including a strain component Epsilonxx in the axial direction of a ultrasonic emission beam, a lateral strain component Epsilonzz and a shearing strain component Epsilonxz; giving a Von Mises strain projection parameter ZetaVM-longiProj and a calculation formula thereof, and imaging the Von Mises strain projection parameter ZetaVM-longiProj to achieve noninvasive high-precision vessel wall elastography. Precise and quantitative vessel wall elastography can be achieved through the method, and the result is superior to those of the conventional other vessel wall strain imaging methods.

A method of reducing the effect of object movements along MRI imaging. The method includes: acquiring a sequence of MRI consecutive images of an object; storing on a computer readable medium, for each of the images, at least one parameter p indicating spatial image orientation at which the image was taken; analyzing the sequence of the images for detection of the object movement; and tagging images of at least one movement of the object.

The present invention provides a magnetic resonance interventional imaging method, system, and medium based on low-rank and sparse decomposition, including: step 1: during the intervention process, continuously collect k-space data by using the golden angle radial sampling method; step 2: The collected k-space data are grouped; Step 3: The method based on low-rank and sparse decomposition and framelet transformation is used to reconstruct the magnetic resonance interventional image. The present invention is based on grouping k-space collection and reconstruction, can carry out reconstruction under the condition of less data collection, has high time resolution and good real-time performance.