58 results about "Magnetic resonance scanner" patented technology

In a method for quantitative detection of parameters in MRI, first and second spoiled gradient echo images and at least one multi-echo steady-state first / second magnetization image are acquired; based on the extended phase graph theory, signal equations are obtained corresponding to the first and second spoiled gradient echo images, the at least one multi-echo steady-state first magnetization image and the at least one multi-echo steady-state second magnetization image; based on the signal equations of the first and second spoiled gradient echo images, the signal equation of the at least one multi-echo steady-state first magnetization image and the signal equation of the at least one multi-echo steady-state second magnetization image, a spoiled gradient echo proton density map, a multi-echo steady-state proton density map, a longitudinal relaxation time map and a transverse relaxation time map of the target tissue are obtained.

Methods and systems are herein provided for determining operating conditions of a magnetic resonance (MR) scanner based on data of one or more implants of a patient and storing the data of the one or more implants are provided. In one examples, a method comprises obtaining data of one or more implants of a patient from one or more sources; determining one or more configurations of each of the one or more implants; displaying, via a graphical user interface (GUI), the data and the one or more configurations; determining a recommendation configuration based on the one or more configurations; determining a selected configuration via user input to the GUI; and determining operating conditions of an MRI scanner based on the selected configuration for an MRI exam.

The present disclosure relates to a target volume tracking method and a computer device. The method includes: determining an isocenter location corresponding to the target volume in a scout image of an object, and obtaining the spatial position of the treatment head in the radiotherapy device, and then determining the at least one slice on the scout image based on the isocenter location and the spatial position, so as to control the magnetic resonance scanner to radiate a RF pulse which excites the at least one slice to obtain a tracking image of the object; the tracking image includes the target volume.

The invention discloses a grey matter brain region anti-magnetic component susceptibility map construction and analysis method and application thereof, which can be used for exploring a global distribution mode of cortical iron deposition of an AD patient on a voxel level and positioning a cortical region with susceptibility related to cognition. The method comprises the following steps: (1) carrying out MR data acquisition on a subject on a magnetic resonance scanner; (2) unwrapping the multi-echo phase image by using a phase unwrapping method based on Laplacian; performing brain stripping processing on the amplitude image of the first echo by using a BET algorithm built in FSL software and generating a binary brain mask image; removing a background field of the unwound phase diagram by using a V-SHARP algorithm in combination with the brain mask diagram; calculating a magnetic susceptibility map from the local field map by using an STAR-QSM algorithm; (3) calculating the cortex thickness by using the T1 weighted structure image, and performing post-processing on the 3D-FSPGR sequence structure image; and (4) carrying out voxel-based whole-brain QSM analysis and cortex thickness statistical analysis.

The invention relates to a quick dynamic support control system compatible with magnetic resonance, which is matched with a magnetic resonance scanner to provide enough correction pressure for hard joints of a human body and realize quick and targeted posture adjustment. The core is a dynamic composite pressure support which has the magnetic resonance imaging characteristic, and deformation of the dynamic composite pressure support can be observed under magnetic resonance scanning. The supporter is formed by compounding a plurality of layers of materials and comprises a sealing layer and a magnetic resonance developing layer. The pressure adjusting device adjusts the pressure of the supports through a pneumatic pump and an air valve, rapid adjustment is achieved by pre-inflating the pressure container, and the control system monitors the pressure of the actuator, adjusts pressure distribution among the supports in real time and maintains dynamic balance of the needed pressure. During magnetic resonance scanning, a patient only needs to wear the support to prepare in a magnetic resonance scanner, and a magnetic resonance compatible material pipeline is connected with a pressure adjusting loop for adjustment. The method is widely applied to the fields of medical imaging and treatment, can provide rapid and accurate support pressure adjustment, and optimizes the treatment effect.

The invention relates to a target area tracking method and device and computer equipment. The method comprises the following steps: acquiring a positioning image of an object through a magnetic resonance scanner, determining the centroid position of a target region in the positioning image, acquiring the spatial position of a treatment head in radiotherapy equipment, determining the position of a target layer on the positioning image according to the centroid position and the spatial position, and determining the position of the target layer on the positioning image according to the position of the target layer. Controlling the magnetic resonance scanner to scan the object to obtain a tracking image; the tracking image includes a target region. By adopting the method, the accuracy of target region tracking can be improved.

A computer system that performs pairwise harmonization is described. During operation, the computer system may receive information specifying magnetic-resonance diffusion measurements, where the magnetic-resonance diffusion measurements are associated with at least an individual and a first site. Then, the computer system may perform the pairwise harmonizing of the magnetic-resonance diffusion measurements based at least in part on target magnetic-resonance diffusion measurements, where the target magnetic-resonance diffusion measurements are associated with a population and one or more target sites, and the magnetic-resonance diffusion measurements and the target magnetic-resonance diffusion measurements may be acquired using different magnetic-resonance scanners. Next, the computer system may perform quality control on the pairwise harmonized magnetic-resonance diffusion measurements, where the quality control may include comparing the pairwise harmonized magnetic-resonance diffusion measurements associated with the first site and the one or more target sites.

An animal aortic plaque magnetic resonance imaging method and system based on a cardiac saturation band, relating to the technical field of magnetic resonance angiography. By means of a magnetic resonance scanner, a scout image of an animal is first acquired to determine a plaque imaging area and the position of a cardiac saturation band; once the cardiac saturation band has been located, respiratory gating is started to trigger collection of data, and by incorporating various magnetic resonance imaging techniques, an animal aortic plaque magnetic resonance imaging result is obtained. A high-resolution and high-contrast animal aortic plaque image can be rapidly acquired, reducing image artifacts. The present invention is suitable for basic and translational research on atherosclerosis model animals, can achieve non-invasive vascular wall structure imaging and composition analysis without applying a contrast agent, and can also implement in-vivo tracking of a new contrast agent and a drug.

1. Name of the designed product: lower housing for a coil of a magnetic resonance scanner. 2. Use of the designed product: component of a medical imaging device. 3. Design points of the designed product: in shape. 4. Picture or photograph best indicating the design points: perspective view.

The invention discloses a reconstruction method for breaking through a low-field magnetic resonance imaging quality limit. The method comprises the following steps: acquiring and constructing a low-field data set; acquiring and constructing a high field data set; respectively training a basic super-resolution model from a low-field low-resolution image excited by 1-N times to a low-field high-resolution image excited by N times; comparing the influence of different excitation times on the performance of the basic super-resolution model; training a cross-field super-resolution model from a low-field and N-time excited high-resolution image to a high-field and ultrahigh-resolution image; cascading the basic super-resolution model and the cross-field super-resolution model to construct an enhanced two-stage cross-field super-resolution model; a high-field and ultrahigh-resolution image is reconstructed from a low-field, low-excitation-frequency and low-resolution image through an enhanced two-stage cross-field super-resolution model. According to the invention, the low-field magnetic resonance scanner can realize high-quality imaging breaking through the magnetic field intensity constraint within a short scanning time.

The application relates to the technical field of medical imaging, in particular to a blood vessel selection arterial spin labeling coding method and device based on signal modulation. The method comprises the following steps: generating a plurality of labeling signal modulation maps on a labeling plane; acquiring the number of blood vessels to be coded and the spatial position of the blood vessels to be coded on the labeling plane; determining a plurality of groups of alternative coding mode combinations; selecting the labeling signal modulation map of each coding mode of each group of alternative coding mode combinations; identifying the corresponding parameter combination and blood vessel labeling signal value in the labeling signal modulation map, so as to form a blood vessel labeling signal value matrix corresponding to each group of alternative coding mode combinations; calculating the loss value of each group of alternative coding mode combinations; selecting a target coding mode combination according to the loss value; feeding back to a magnetic resonance scanner; and performing blood vessel coding and scanning of the blood vessels to be coded by the magnetic resonance scanner. Thus, the problems of the related art, such as the requirement that the signal modulation curve is a cosine function, low universality and low coding accuracy, are solved.

The present invention discloses an unsupervised learning non-Cartesian magnetic resonance intelligent rapid imaging method, which relates to the fields of medical image processing and magnetic resonance imaging technology. The method comprises the following steps: first, acquiring non-Cartesian undersampled k-space data from a magnetic resonance scanner, dividing the undersampled k-space data into two complementary subsets 1 and 2 according to the order of acquisition, thereby forming a training set; then, designing a deep learning network for magnetic resonance intelligent rapid reconstruction based on unsupervised separating subspace learning for non-Cartesian sampling, the network's inference function, and a loss function; then, using the training set obtained in step S1, determining the optimal parameters of the deep learning network based on unsupervised separating subspace learning; and finally, inputting the non-Cartesian undersampled k-space data to be reconstructed into the trained deep learning network to reconstruct the magnetic resonance image. The present invention has the characteristics of not requiring full sampled data, fast reconstruction speed, and high reconstruction quality.

The invention provides a nuclear magnetic resonance examination bed and a method for cleaning a nuclear magnetic resonance scanner, and relates to the technical field of nuclear magnetic resonance examination. The nuclear magnetic resonance examination couch comprises a magnetic resonance scanner body and a scanning couch body, a base is arranged on the lower side of the scanning couch body, a cleaning unit is arranged on the outer side of the scanning couch body and comprises guide plates, the guide plates are fixedly connected to the front side and the rear side of the scanning couch body, and guide blocks are slidably connected to the outer sides of the guide plates. A fixing frame is fixedly connected between the guide blocks on the front side and the rear side, a plurality of connecting rings are fixedly connected to the outer side of the fixing frame, and a sponge alcohol block is arranged between every two connecting rings. By arranging a guide plate, a guide block, a first inclined plate, a second inclined plate, a fixing frame, a connecting ring and a sponge alcohol block, the scanning bed body can conveniently control the sponge alcohol block to clean the inner wall of the scanner and control the sponge alcohol block to move repeatedly, the cleaning effect is improved, and operation is easy.

The invention discloses an animal aortic plaque magnetic resonance imaging method and system based on a cardiac saturation zone, and belongs to the technical field of magnetic resonance angiography. Firstly, a positioning image of an animal is obtained through a magnetic resonance scanner, and the positions of a plaque imaging area and a heart saturation zone are determined; after heart saturation zone positioning is completed, respiratory gating is started to trigger data acquisition, and animal aortic plaque magnetic resonance imaging results are obtained in combination with multiple magnetic resonance imaging technologies. High-resolution and high-contrast animal aortic plaque images can be quickly obtained, and image artifacts are reduced. The method is suitable for fundamental research and transformation research of atherosclerosis model animals, can be used for non-invasive blood vessel wall structure imaging and component analysis without contrast agents, and can also be used for living body tracking of novel contrast agents and drugs.

Methods and systems are provided herein for determining operating conditions of a magnetic resonance (MR) scanner based on data of one or more implants of a patient and storing the data of the one or more implants. In one example, a method includes obtaining data of one or more implants of a patient from one or more sources (702); determining one or more configurations for each of the one or more implants (710); displaying (810) the data and the one or more configurations via a graphical user interface (GUI); determining a recommended configuration based on the one or more configurations (714); determining a selected configuration via a user input to the GUI (716); and determining an operating condition of the MRI scanner based on the selected configuration for the MRI examination (718).

The present invention discloses an animal bed device based on a cryogenic coil for <supgt;129< / supgt;Xe MRI of the brain. The present invention adjusts in various ways through front and rear positioning rods, a lifting table, and fine-tuning long bolts to make the brain of the experimental animal closely adhere to the cryogenic coil, ensuring a high filling factor of the coil, and thus ensuring a high signal-to-noise ratio of the imaging. The present invention is also provided with a simulation chamber, which restores the relative positions of the cryogenic coil and the animal bed in the cavity of the magnetic resonance scanner in a 1:1 manner, and ensures that the brain of the experimental animal closely adheres to the cryogenic coil when the animal bed enters the cavity of the magnetic resonance scanner without using the conventional laser positioning method. The cryogenic coil simulation component and the cryogenic coil housing simulation part are made of transparent materials, facilitating the observation of the fitting degree between the experimental animal and the cryogenic coil simulation component and adjustment; the lifting table of the present invention also provides a flat surface to support the brain of the animal, preventing the animal from being unable to be properly positioned due to interference from the tracheal intubation during animal positioning.

The embodiment of the present application discloses a method and device for limiting radio frequency alternating magnetic field in magnetic resonance imaging. The method comprises: measuring the vertical distance between a local coil placed on the scanned part of a patient and the center of the detection hole of a magnetic resonance (MR) scanner; determining the deviation between the field strength of the B1 field at the position of the local coil and the field strength of the B1 field at the center of the detection hole according to the vertical distance; calculating the conversion coefficient between the field strength of the B1 field at the position of the local coil and the field strength of the B1 field at the center of the detection hole according to the deviation; and calculating the maximum allowable field strength of the B1 field at the center of the detection hole according to the field strength of the B1 field required when the surface temperature of the local coil is equal to the upper limit of the safe temperature and the conversion coefficient. The embodiment of the present application can limit the B1 field in a smaller but still effective field strength range, thereby reducing the waste of the performance of the B1 field while ensuring the safety of the patient and the quality of the MR imaging.

This application relates to a magnetic resonance imaging (MRI) scanning method and a MRI system. The method includes: a processor determining the distance from a target region of the subject to the center of the MRI scanner based on the physiological characteristics of the subject; controlling the MRI scanning bed to move the subject according to the distance, so that the target region is moved to a position corresponding to the center of the MRI scanner; and using a receiving coil to receive the MRI signal generated by the nuclear spin of the target region, reconstructing the MRI signal to obtain a medical image of the target region. The receiving coil includes multiple nodes, and the relative positions of at least two adjacent nodes are adjustable. In this method, before entering the scanning chamber, the processor calculates the distance between the target region and the center of the MRI scanner in the MRI scanning system based on the physiological characteristics and target region information of the subject, and completes the automatic scanning and positioning of the target region based on the receiving coil, thus improving the efficiency of MRI scanning.

A method and a system include obtaining calibration scan data or low resolution images of a subject acquired with a magnetic resonance (MR) scanner of an MR imaging system. The method and the system also include inputting the calibration data or the low resolution images into a trained deep learning-based multi-mask segmentation network. The method and the system further include outputting labeled mask images for different anatomical stations, wherein a respective mask of a respective labeled mask image highlights an anatomical landmark of interest in each respective anatomical station of the different anatomical stations. The method and the system even further include determining an extent of a respective anatomical landmark of interest in each respective anatomical station of the different anatomical stations for a respective localizer scan for each respective anatomical station based at least on a respective label mask image for each respective anatomical station.

A method for performing magnetic resonance (MR) scanner simulation in a magnetic resonance imaging (MRI) simulator is described, the method comprising: inputting data parameters into a web interface of the MRI simulator, wherein the inputted data parameters are at least pulse sequences and an anatomical model; connecting the web interface and a cloud-based simulator engine of the MRI simulator to pass the data parameters to the cloud-based simulator engine, the method comprising: importing a pulse sequence calculation model; setting the inputted data; and slice selection on the obtained images in the web interface; the method further comprising: recomputing the data parameters to provide one or more simulated MR signals, the recomputing being performed in the cloud, and wherein the method further comprises: reconstructing an MR image based on the one or more simulated MR signals, the reconstruction of the MR image being performed in the cloud; and sending the MR image to the web interface.

The invention belongs to the technical field of medical detection and medical instruments, and discloses a magnetic resonance compatible vestibular cold and hot water stimulation system, which comprises a cold and hot water module, a stimulation module and a control module, wherein the cold and hot water module is used for conveying water with a set temperature to the stimulation module and recycling the water output by the stimulation module for cyclic utilization; the stimulation module is made of a magnetic resonance compatible material and used for circularly and alternately conveying cold water and hot water to the two ears of the subject and conveying water flowing out of the ear canals to the cold and hot water module; the control module is used for controlling the stimulation module to circularly and alternately convey cold water and hot water to the ears of the subject according to a preset time sequence according to the synchronizing signal of the magnetic resonance scanner, collecting eye movement data of the subject in real time, and controlling and adjusting the water temperature of the cold and hot water module according to the eye movement data. According to the invention, accurate synchronization of the stimulation process and magnetic resonance scanning is realized, and personalized stimulation intensity customization and stable maintenance of the stimulation effect in long-time scanning are realized.

The application discloses a kind of quantitative magnetic susceptibility imaging method and device based on radial sampling, comprising: by magnetic resonance scanner executes three-dimensional gradient echo multi-echo sequence, and the three-dimensional k space multi-echo data of tissue is collected in radial sampling mode;The three-dimensional k space multi-echo data collected is corrected and density is compensated to obtain the three-dimensional k space multi-echo data and corrected track RT after track correction and density compensation;The three-dimensional k space multi-echo data and corrected track RT after track correction and density compensation are input into non-uniform fast Fourier transform reconstruction complex image, to obtain corresponding amplitude diagram and phase diagram;Phase diagram is unwound and background field is removed, to obtain corresponding local field;By improved sparse linear equation and least square method ILSQR algorithm inversion local field, corresponding magnetic susceptibility distribution diagram is generated.The method and device of the application reduce the influence of motion artifact, improve imaging quality and diagnostic accuracy.

The application discloses a kind of based on PCA's magnetic resonance imaging parameter virtual simulation method, comprising the following steps: S1: determine the required magnetic resonance imaging parameter kind, and calculate the full combination of all parameter kinds;S2: to each parameter combination in full combination, scan imaging or carry out finite element calculation simulation imaging according to parameter setting on real magnetic resonance scanner, obtain the database of three-dimensional body data of imaging;S3: to database using PCA algorithm is reduced dimension processing, obtains one-dimensional compressed vector;S4: according to imaging parameter setting find adjacent parameter combination, query its corresponding compressed vector, carry out linear interpolation, fold into three-dimensional body data again, obtain virtual simulation imaging.The application uses PCA algorithm to the dimension reduction of magnetic resonance multi-parameter combination pre-imaging database, after dimension reduction, only need to store low-dimensional compressed vector and a small amount of principal component image, in simulation process, interpolation is carried out to compressed vector, then image recovery is carried out, with low storage and low calculation amount.

The present disclosure relates to a method and device for distinguishing a high-fat voxel and generating a fat fraction map by means of magnitude-based multi-echo magnetic resonance imaging, the method including obtaining, with a magnetic resonance scanner, three or more opposed-phase OP image data corresponding to an opposed-phase and three or more in-phase IP image data corresponding to an in-phase in accordance with a plurality of echo times of a subject, confirming, with the magnetic resonance scanner, a voxel value for voxels constituting each of the image data, determining, with the magnetic resonance scanner, a high-fat voxel in which high-fat is located among the image data based on the voxel value, and generating, with the magnetic resonance scanner, a fat fraction map by selectively applying different fat fraction equations in accordance with a result of the determination of the high-fat voxel, and may be applied to other embodiments.

In an example, a computer system receives first data regarding a magnetic resonance imaging (MRI) protocol for obtaining image information regarding a subject, and determines a plurality of parameter sets for performing the MRI protocol. Each of the parameter sets includes an indication of one or more parameters associated with the MRI protocol, and for each of the one more parameters, an indication of a respective parameter value. The computer system determines, for each of the parameter sets, a respective first quality metric, and selects a particular one of the parameter sets based on the first quality metrics. The computer system provides instructions for performing the MRI protocol to a magnetic resonance (MR) scanner. The instructions include an indication of the selected parameter set.

Systems and methods include determination of a field map representing inhomogeneity of a main magnetic field of a magnetic resonance scanner within a subject, determination of a pixel shift map based on the field map, operation of the magnetic resonance scanner to generate an image of the subject, determination of a portion of the pixel shift map corresponding to a phase-encoding line of the image, determination of a distortion matrix corresponding to the portion of the pixel shift map, determination of a locally-regularized pseudoinverse distortion matrix based on the distortion matrix, and correction of the line of the image based on the locally-regularized pseudoinverse distortion matrix.

1. Name of the designed product: cuff member for a coil of a magnetic resonance scanner. 2. Use of the designed product: a component of a medical imaging device. 3. Design points of the designed product: in shape. 4. Picture or photograph best indicating the design points: perspective view.

A computer system that performs pairwise harmonization is described. During operation, the computer system may receive information specifying magnetic-resonance diffusion measurements, where the magnetic-resonance diffusion measurements are associated with at least an individual and a first site. Then, the computer system may perform the pairwise harmonizing of the magnetic-resonance diffusion measurements based at least in part on target magnetic-resonance diffusion measurements, where the target magnetic-resonance diffusion measurements are associated with a population and one or more target sites, and the magnetic-resonance diffusion measurements and the target magnetic-resonance diffusion measurements may be acquired using different magnetic-resonance scanners. Next, the computer system may perform quality control on the pairwise harmonized magnetic-resonance diffusion measurements, where the quality control may include comparing the pairwise harmonized magnetic-resonance diffusion measurements associated with the first site and the one or more target sites.

A computer-implemented method for suppressing fat in reconstructed magnetic resonance imaging data includes generating, via a processor, a first echo image and a second echo image from magnetic resonance scan data acquired of a subject with a magnetic resonance scanner utilizing a multi-echo steady state sequence. The computer-implemented method also includes estimating, via the processor, an echo phase difference between the first echo image and the second echo image to generate an echo phase difference image. The computer-implemented method further includes identifying, via the processor, voxels in the echo phase difference image having an extra chemical shift phase. The computer-implemented method even further includes removing, via the processor, signals of the voxels identified having the extra chemical shift phase in both the first echo image and the second echo image to generate a first fat-removed image and a second fat-removed image, respectively.