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

The present invention is directed to a system, method and software program product for implementing an efficient, low-radiation 3-D Complete-Body-Screening (3D-CBS) medical imaging device which combines the benefits of the functional imaging capability of PET with those of the anatomical imaging capability of CT. The present invention enables a different detector assembly, and together they enable execution of more complex algorithms measuring more accurately the information obtained from the collision of the photon with the detector. The present invention overcomes input and coincidence bottlenecks inherent in the prior art by implementing a massively parallel, layered architecture with processor separate stacks for handling each channel. The prior art coincidence bottleneck is overcome by limiting coincidence comparisons to those with a time stamp occurring within a predefined time window. The increased efficiency provides the bandwidth necessary for increasing the throughput even more by extending the FOV to over one meter in length and the execution of even more complex algorithms.

The invention discloses an imaging method. The imaging method comprises the following steps: putting an object in a detection region, and biasing a detector; moving an imaging system along a longitudinal Z axis; enabling a ray source and a detector to synchronously move along the periphery of the object, scanning and acquiring data, and performing completion and faultage according to the data. According to the imaging method disclosed by the invention, the detector biasing and spiral trajectory scanning are combined to solve a problem that an image assembly method used by a conventional CT (computed tomography) imaging (particularly cone-beam CT imaging) generates artifact on the assembly image for the cone-beam CT covered by a long Z axis, so that a usage area of the detector is reduced, and the system cost is saved.

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.

The invention relates to a three-dimensional image splicing method, device, equipment and system and a storage medium. The method is applied to an X-ray medical imaging system, the X-ray medical imaging system comprises a detector and array X-ray sources, the array X-ray sources comprise a plurality of X-ray sources with different projection angles, and imaging areas corresponding to the X-ray sources are formed on the detector. The method comprises the following steps: acquiring projection data of each region of a to-be-detected part, wherein the projection data is generated by exposing eachregion by X-ray sources which are located at at least two different projection angles relative to the regions among the array X-ray sources; respectively carrying out three-dimensional image reconstruction on the projection data of each region to obtain reconstructed image blocks; and splicing the reconstructed image blocks according to the relative position relationship among the reconstructed image blocks so as to obtain a three-dimensional reconstructed image of the to-be-detected part. By adopting the method, the quality of the three-dimensional reconstructed image can be improved.

In a method for performing recordings for dual absorptiometry, a high-energy radiation pulse is performed before a low-energy radiation pulse. Furthermore the high-energy radiation pulse is arranged at the end of an assigned radiation window of the detector. This temporal sequence of a high-energy radiation pulse and a low-energy radiation pulse allows the total time for performing the recordings for dual absorptiometry to be minimized.

The invention discloses a flexible temperature sensor comprising a microstructure and a preparation method, the flexible temperature sensor comprising the microstructure comprises a substrate, a first flexible layer, a conductive layer and a second flexible layer which are sequentially arranged from bottom to top, the substrate is provided with a conical microstructure, the conical microstructure is integrally formed on the substrate, the first flexible layer is arranged on the substrate, and the conductive layer is arranged on the second flexible layer. The top of the conical microstructure protrudes out of the second flexible layer, the conductive layer comprises a temperature sensor and an output assembly used for outputting a temperature signal, the output assembly comprises a temperature signal interface and a temperature signal output wire, one end of the temperature signal output wire is connected with the temperature signal interface, and the other end of the temperature signal output wire is connected with the temperature sensor. The flexible temperature sensor has high fitting degree with the skin, does not generate motion artifacts, and improves the accuracy of monitoring signals of the flexible temperature sensor.

The invention discloses an automatic breath-holding detection device for CT scanning. The automatic breath-holding detection device comprises a breath-holding detection host, an elastic waistband andtwo tension belts. Two tension sensors and a detection circuit are arranged in the breath-holding detection host; each tension sensor is connected with a tension belt through a tension ring; one end of each tension ring is fixed in the corresponding tension sensor, and the other end of the tension ring is connected to one end of the corresponding tension belt; a B-shaped plastic buckle is arrangedat the other end of the tension belt; one end of the elastic waistband is fixedly arranged on the corresponding B-shaped plastic buckle; each tension sensor is used for converting physical tension borne by the corresponding tension belt to an analog electric signal; and the detection circuit is used for detecting and analyzing the analog electric signal, generating a tension value, outputting thetension value to an LCD display screen for display, and controlling a loudspeaker to make a warning sound when the tension value does not reach a breath-holding threshold. The device can detect the breath-holding condition of a patient under CT scanning, prevent motion artifacts caused by abdominal breathing motion when the patient holds breath, and improve the quality of CT scanning images.

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.

Method and Apparatus for eliminating motion artifacts in magnetic resonance imaging are disclosed according to the present invention. The present invention relates to magnetic resonance imaging field. The method for eliminating motion artifacts in magnetic resonance imaging according to the present invention utilizes the concept of iterative approximation to control the difference between the data lines in the K-space caused by motions and allow the common features between the data lines to be remained, such that the motion artifacts in the reconstructed image are restrained and the motion artifacts caused under various circumstances are well restrained. Accordingly, the quality of the magnetic resonance imaging is improved.

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.

A method for generating a magnetic resonance image with a magnetic resonance tomography system is provided. A patient is positioned in the magnetic resonance tomography system, wherein the region of the patient to be imaged in the magnetic resonance image is covered with a sound-dampening blanket. The back and / or abdomen of the patient are covered by the sound-dampening blanket, while the magnetic resonance image is generated.

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.

The invention discloses a propeller for an angiography detection die body. The propeller comprises a propulsion device and a remote control device; the propulsion device comprises a casing and an electric push rod arranged in the casing, a through hole is formed in the side wall of the casing, and the electric push rod can stretch out along the through hole; the remote control device comprises a handheld remote control transmitter and a remote control receiver, the handheld remote control transmitter comprises an input button, a remote control coding module and a transmitting antenna, and theinput button is connected with the transmitting antenna through the remote control coding module; the remote control receiver is arranged in the casing and comprises a receiving antenna and a receiving circuit, and the receiving circuit is in control connection with the electric push rod. The propeller is simple in structure and convenient to operate, detecting personnel can control the propellerto push the die body outdoors to continuously expose the die body, the influence of rays on the detecting personnel is reduced accordingly, and the motion artifact generated by manual operation can beavoided at the same time.

An imaging method, the object is placed in the detection area, and the detector is biased, and then the imaging system is moved along the longitudinal Z-axis, the ray source and the detector synchronously move around the object in a circular motion, scan and collect data, and Complement the fault based on the data. The imaging method of the present invention adopts the combination of detector bias and helical trajectory scanning to solve the image stitching method used in traditional CT imaging (especially cone beam CT imaging) to image at the stitching place of cone beam CT covered by the long Z axis The problem of artifacts is generated, and the area used by the detector is reduced to save system cost.

A method and apparatus are provided to improve large field of view CT image acquisition by using at least two scanning procedures: (i) one with the radiation source and detector centered and (ii) one in an offset configuration. The imaging data obtained from both of the scanning procedures is used in the reconstruction of the image. In addition, a method and apparatus are provided for detecting motion in a reconstructed image by generating a motion map that is indicative of the regions of the reconstructed image that are affected by motion artifacts. Optionally, the motion map may be used for motion estimation and / or motion compensation to prevent or diminish motion artifacts in the resulting reconstructed image. An optional method for generating a refined motion map is also provided.