91 results about "Magnet resonance imaging" patented technology

The utility model discloses a fan assembly, patient ventilation system and magnetic resonance imaging system for patient ventilation system in magnetic resonance imaging system, wherein, fan assembly includes: fan group, it includes at least two axial flow fan, at least two axial flow fan is fixed with the way of realizing air port series pressurization, magnetic shielding casing, it covers the periphery of fan group, air inlet connector, it is arranged on the air inlet side of magnetic shielding casing near fan group for with the air inlet pipeline connection of patient ventilation system, and air outlet connector, it is arranged on the air outlet side of magnetic shielding casing near fan group for with the patient ventilation pipeline connection of patient ventilation system. The technical scheme in the utility model embodiment can solve the patient ventilation problem of MRI system.

A radio frequency (RF) receiver assembly (100) for use in a magnetic resonance imaging (MRI) system is described. The receiver assembly (100) comprises a primary resonant circuit (101) coupled to a preamplifier (106) via capacitive coupling, and a secondary resonance circuit (104) comprising of at least one inductor (104a) coupled between a first switch (103) and the capacitive coupling. The first switch (103) is circuited between the primary (101) and the secondary (104) resonant circuits, and the preamplifier (106).

The embodiment of the application discloses a kind of Alzheimer's disease classification and key brain area determination method based on random attention and counterfactual contrast learning, it is related to medical image analysis technical field;Alzheimer's disease classification and key brain area are determined by the functional magnetic resonance imaging data of subject;The accuracy, overall performance and stability of the graph convolution network model are significantly better than the existing GNN baseline model in the AD vs.NC task of ADNI real data set;The output key brain area node is highly consistent with clinical medicine priori;Specific brain area and functional connection leading to abnormal classification can be intuitively presented;It conforms to the real pathological mechanism, and whether the verification model in the same framework is really highly dependent on the selected key brain area structure, so that the explanation result can be accepted by clinician in the medical scene with extremely high safety requirement.

By extending the lifespan of the refrigeration unit and reducing the frequency of replacement, the operating rate of the MRI system will be improved. [Solution] The cold head life extension mode is implemented. In the cold head life extension mode, the refrigerator's displayer is operated at a constant frequency lower than a predetermined upper frequency, regardless of the temperature of the superconducting coil, and the compressor inverter controls the drive frequency of the compressor drive unit according to the temperature of the superconducting coil.

Provided herein is a noninvasive method for measuring pH, glucose and glycogen levels using a single acquisition method, as well as systems for performing the method. This method for glycogen / glucose (and pH) detection has high specificity enabled by superior chemical shift separation in high-strength magnetic fields. The methods have applications in detecting changing tumor microenvironments in cancerous cells for measuring important metrics for noninvasive and quantitative metabolic profiling.

The present invention relates to a magnetic resonance imaging (MRI) apparatus (1) designed to image essentially metallic components, comprising means (b") for generating a polarizing magnetic field intended to be applied to the component (a), radio frequency (RF) means (g) for exciting the component (a), detection means cooperating with the antenna means for delivering a magnetic resonance imaging (MRI) signal, and means for processing the MRI signal to provide characteristic information about the state of the component (a). The component (a) is subjected to a very weak magnetic field of less than 10 mT, and the detection means comprises a pickup coil (h) magnetically coupled to the polarizing means (b") and the radio frequency means (g) and acting as a magnetic flux concentrator, and a SQUID (Superconducting Quantum Interference Device) detector located downstream of the pickup coil (h) via a transformer.

A quantitative, ultrashort time to echo, contrast-enhanced magnetic resonance imaging technique is provided. The technique can be used to accurately measure contrast agent concentration in the blood, to provide clear, high-definition angiograms, and to measure absolute quantities of cerebral blood volume on a voxel-by-voxel basis.

According to the invention, a radio frequency antenna system (1) for a magnetic resonance imaging device comprising a radio frequency coil (2) which, when mounted in a bore of the magnetic resonance imaging device has a total coil impedance composed of a coil impedance and a patient-specific impedance of a patient, a preamplifier (3) connected to the radio frequency coil (2), by means of which a signal received by the radio frequency coil (2) can be amplified and an amplified output signal can be output, a matching network (4) which is interconnected between the radio frequency coil (2) and the preamplifier (3) with which the total coil impedance of the radio frequency coil (2) is adjustable and a controller (5), wherein the radio frequency coil (2) comprises a first coil loop (6) and at least one further coil loop (7), the controller (5) is connected to the radio frequency coil (2), the matching network (4) and the preamplifier (3) and the controller (5) is adapted for noise impedance matching between the radio frequency coil (2) and the preamplifier (3) as a function of patient-specific parameters by controlling the employment of the first coil loop (6) and the at least one further coil loop (7) and by controlling the matching network (4). In this way, a radio frequency antenna system with improved impedance matching is provided.

An apparatus for multiphoton parallel transmission for magnetic resonance imaging (MRI) of a subject, includes a radio frequency (RF) transmit coil, a single-channel universal excitation coil positioned outside of the RF transmit coil, and a processor device coupled to the RF transmit coil and the single-channel universal excitation coil. The RF transmit coil is configured to perform at least one RF excitation pulse of a multiphoton parallel transmit excitation comprising a multiphoton excitation pulse configured to correct spatial inhomogeneities and the single-channel universal excitation coil is configured to perform a low-frequency excitation pulse of the multiphoton excitation pulse. The processor device is configured to control current waveforms provided to the RF transmit coil to perform the at least one RF excitation pulse and to control current waveforms provided to the single-channel universal coil to perform the low frequency excitation pulse of the multiphoton excitation pulse.

The application provides a radio frequency coil applied to a magnetic resonance imaging device, which comprises a plurality of loop-shaped coil units, the plurality of coil units are distributed in a circumferential direction around a preset axis and are sequentially connected; a plurality of feed ports corresponding to the coil units, the feed ports are arranged on the corresponding coil units; and a plurality of capacitors, at least one capacitor is coupled to each coil unit. Through the above configuration, the capacitors are arranged to adjust the circuit characteristics of the coil units; compared with the prior art, the plurality of coil units and the corresponding plurality of feed ports can increase the number of channels of the radio frequency coil to be greater than four, so that the radio frequency coil can be applied to a high-field or ultrahigh-field transmitting coil; in addition, the cooperation of the plurality of coil units and the plurality of feed ports can also improve the shimming of the radio frequency coil.

The application relates to a brain region segmentation method based on multi-sequence magnetic resonance imaging collaborative feature fusion, which comprises the following steps: collecting brain amplitude graph data, phase graph data and T1 structure image data; carrying out pretreatment and reconstruction processing on the amplitude graph data and the phase graph data to obtain a quantitative magnetization rate image; carrying out segmentation labeling after spatial registration of the T1 structure image data and the quantitative magnetization rate image to construct a brain region segmentation label data set; training a CIA-Net deep learning model through a training set in the brain region segmentation label data set to obtain a trained CIA-Net deep learning model; inputting the quantitative magnetization rate image to be segmented and the T1 structure image data into the trained CIA-Net deep learning model to output an automatic segmentation result of the brain region. The application can realize automatic fine segmentation of a cranial magnetic resonance image under the conditions of fine granularity and a large number of brain regions, and improve the accuracy, structural consistency and stability of the segmentation result.

This invention discloses a pure hardware magnetic resonance imaging (MRI) signal receiver and feature extractor, belonging to the field of medical device technology. The core signal processing function of this feature extractor is implemented by pure analog circuitry, without relying on any digital signal processing unit. It includes an analog receiving front-end that processes the MRI signal according to reference parameters stored in a one-time programmable memory. The pure analog feature extractor directly extracts the physical features of the MRI signal from the processed analog signal. All calibration parameters are permanently stored in the one-time programmable memory at the factory and cannot be modified during operation. This invention can effectively improve the speed and accuracy of MRI signal processing while reducing system complexity and power consumption.

This invention discloses a magnetic resonance imaging (MRI) sequence translation communication control system and method. The system includes: a parameter customization module for receiving and verifying user-configured MRI parameters; a sequence generation module for generating MRI sequence files conforming to the Pulseq standard based on the verified parameters; a sequence translation module for translating the MRI sequence files into a TLV format hardware instruction stream according to the target spectrometer hardware configuration file; a hardware control module for writing the TLV instruction stream into the spectrometer hardware registers via an open hardware instruction bus, controlling the spectrometer to transmit radio frequency pulses, apply gradient fields, and acquire MRI signals; and a verification and feedback module for real-time monitoring of hardware execution status and data consistency verification. This invention solves the problems of complex hardware interfaces and poor sequence portability in existing MRI systems by constructing a closed-loop architecture of "parameter configuration - sequence generation - TLV translation - hardware execution," thereby improving the system's versatility, scalability, and control accuracy.

The utility model provides a kind of ankle coil, including a support shell (100) and several coil units (200).Support shell includes a first support part (110), a second support part (120) and a cover plate (130).The first support part is used to support the sole part.The second support part is connected to the first support part and is used to support the heel and calf, and an opening (121) is formed on the second support part for the foot to enter and exit.The cover plate is rotatably connected to the first support part, and the cover plate can be rotated to open or close the opening.Several coil units are respectively arranged on the first support part, the second support part and the cover plate.When the cover plate closes the opening, each coil unit at least overlaps with one of the remaining coil units.The ankle coil is easy to wear and not easily damaged.The utility model also provides a magnetic resonance imaging system with the ankle coil.

A system includes a controller configured to receive three dimensional (3D) imaging input and feedback and generate output, the 3D imaging input including real-time or pre-processed data of a magnetic resonance imaging (MRI) / computerized tomography (CT) scan, the controller interfacing with a stereotactic robot.

The application belongs to the technical field of carrying equipment, and provides a coil carrying device for a magnetic resonance imaging instrument, which comprises a rack, a first conveying mechanism arranged at one end of the top of the end face of the rack in the X-axis direction, which is used for conveying coils between a carrying station and multiple transfer stations, a coil carrying mechanical arm arranged at one end of the first conveying mechanism, which is used for grabbing and carrying coils between a workbench of the magnetic resonance imaging instrument and the first conveying mechanism, and multiple coil transfer units arranged in sequence and at intervals along the conveying direction of the first conveying mechanism, each of which corresponds to a coil storage station and is used for transferring coils between the corresponding storage station and the first conveying mechanism. The coil carrying device for the magnetic resonance imaging instrument can automatically carry coils, has high work efficiency, and is safer and more reliable.

To enable easy access to an object during imaging while widely securing an imaging region in the head-foot direction of the object in imaging using an open-type static field magnet.SOLUTION: In one embodiment, a static field magnet to be used in an MRI apparatus that images an object (P), includes at least one loop coil pair including a first loop coil to be supplied with an electric current in a first direction and a second loop coil to be supplied with an electric current in a second direction opposite to the first direction, wherein a first coil plane, being a planar area surrounded by a first loop that forms the first loop coil, and a second coil plane, being a planar area surrounded by a second loop that forms the second loop coil, are arranged along a specific direction on a specific plane without overlapping each other, and the loop coil pair generates a static magnetic field parallel with the specific direction.SELECTED DRAWING: Figure 1

The present disclosure relates generally to medical imaging and, more particularly, it relates to methods and systems for performing processing of magnetic resonance (MR) imaging of the brain which may be useful in the diagnosis of cognitive disorders. More specifically, the invention includes methods for processing cortical diffusion data from a region of a subject's brain, comprising determining values for the Axial Columnar Refraction (ACR) using values for AngleR and Axial Diffusivity.

This application relates to the fields of medical image processing and AI-assisted diagnosis, and specifically to a collaborative perception method based on multi-scale brain network features. The method includes: acquiring resting-state functional magnetic resonance imaging (fMRI) data of a subject and constructing a brain functional connectivity matrix after preprocessing; collaboratively extracting multi-scale brain network features from the brain functional connectivity matrix through parallel global and local perception flows; fusing the global and local feature representations across scales to generate a collaborative feature representation; and outputting classification results based on the collaborative feature representation using a classifier. This method can address the technical problems of existing single-scale models, such as high risk of missed diagnoses due to perceptual blind spots and insufficient discriminative power for complex pathological patterns, thereby improving the overall classification performance of the model.

Magnetic resonance imaging (MRI) systems and compositions thereof are provided. The MRI systems may include a main magnet configured to generate a primary magnetic field, the primary magnet forming a bore. The MRI system may include a gradient coil arranged in the bore and configured to generate a gradient magnetic field that provides a magnetic field environment with the main magnetic field. The gradient coil may include a shielding gradient coil including two or more coil units. One of the two or more coil units may be wound along a first coil path. Another one of the two or more coil units may be wound along a second coil path. The MRI system may also include a shimming structure arranged between the gradient coil and the primary magnet and configured to homogenize the main magnetic field.

The present disclosure provides various devices, systems, and methods for active shimming for an MRI system. For example, an MRI system can a first gradient coil, a second gradient coil, a third gradient coil, and a permanent magnet. The permanent magnet is configured to generate a magnetic field B0 having a low field strength. A method for active shimming the MRI system can include a set of candidate shimming configurations with first current values associated with the first gradient coil, second current values associated with the second gradient coil, and third current values associated with the third gradient coil. The method further includes applying, for each candidate shimming configuration, a pulse sequence; acquiring, for each pulse sequence, a magnetic resonance (MR) signal; determining, for each MR signal, a signal bandwidth based on a frequency domain of the MR signal; and designating a shimming configuration for the MRI system.

This invention relates to the field of ultrasound therapy technology, specifically to an ultrasound localization method based on low-field magnetic resonance imaging (MRI). The method addresses the issues of large equipment size and high cost in existing ultrasound targeting techniques. By introducing a parallel ultrasound scanning process during the initial MRI scan to obtain ultrasound echo data, which is then stitched together with the MRI data. Subsequently, during target area localization, the ultrasound echo data and MRI data are analyzed simultaneously, enabling accurate localization of the target area in the brain and identification of easily penetrable locations on the skull where ultrasound energy can pass through. Based on this, an ultrasound probe with better penetration is selected as the focusing probe, eliminating probes with low emission efficiency, thereby improving the efficiency of ultrasound localization. Furthermore, improvements to the model allow the examination process to be performed using a low-field MRI system, reducing system costs.

The application discloses a traveling wave antenna unit, an array and a method for improving high-field magnetic resonance radio frequency field uniformity, relates to the field of magnetic resonance imaging, and aims to improve high-field magnetic resonance radio frequency field uniformity. The application increases the component of the wave number of the traveling wave antenna unit in the traveling wave transmission line direction in the traveling wave antenna array through physical or chemical means to relieve the radial standing wave effect. The traveling wave antenna unit comprises a layer-by-layer designed metal microstrip, a first bearing substrate, a filling layer substrate, a slotted metal floor, a second bearing substrate and a spacing layer substrate. A feeding port is connected between the first end of the metal microstrip and the slotted metal floor, and a load is connected between the second end of the metal microstrip and the slotted metal floor. The filling layer substrate is a fillable structure. The component in the traveling wave transmission line direction is increased by increasing the relative dielectric constant of the filling medium or changing the slotted structure. The application is simple in design, convenient in operation and does not need additional hardware.

This invention relates to the field of multimodal data fusion and neurodegenerative disease classification, specifically a dementia classification method based on knowledge-guided image diffusion reasoning. First, initial features are extracted from magnetic resonance imaging (MRI) data using a 3D neural network, and a conditional diffusion model is used to generate category-enhanced image features. Simultaneously, a dementia knowledge graph is constructed from clinical metadata to integrate domain prior knowledge. Then, the enhanced image features and the knowledge graph embedding representation are input into a multimodal learning framework. This framework aligns and fuses information from the two modalities through bimodal consistency learning and modality-specific learning achieved through contrastive learning. Finally, the fused features are fed into a classifier for dementia classification. This invention provides a novel knowledge-guided deep learning framework for dementia classification, effectively overcoming the challenges of limited data and poor interpretability faced by traditional models, and significantly improving the accuracy and robustness of classification.

The application provides a control system of a magnetic resonance imaging system, which comprises: a vibration sensor for collecting a first vibration signal of a gradient coil of the magnetic resonance imaging system; a patient voice collection module for collecting an initial voice signal of a patient after a pre-stored signal reading delay time; a voice control device comprising a first signal processing module connected with the vibration sensor and the patient voice collection module respectively, for receiving and preprocessing the first vibration signal and the initial voice signal, performing amplitude correction on the preprocessed first vibration signal based on a pre-stored amplitude gain adjustment parameter, obtaining a second vibration signal, performing gradient noise elimination on the preprocessed initial voice signal based on the second vibration signal to obtain a target voice signal; a central control console connected with the first signal processing module, for obtaining the target voice signal and sending it to a first voice playing module; and the first voice playing module for playing the target voice signal.

The application discloses a TR switch driving device and a magnetic resonance imaging system, and relates to the technical field of driving circuits. The application is specially used in the field of MRI nuclear magnetic system. The device comprises a low-voltage input unit, a driving module unit and a high-voltage output unit. The driving module unit comprises a group of mutually exclusive units of three-stage symmetrical amplification links with the same structure. The device is compatible with TTL single-end or differential input. The low-voltage signal is converted into 0-100V mutually exclusive high-voltage output through the three-stage symmetrical amplification links. The <200ns fast switching is realized by using an acceleration capacitor. The output is reliable under power-on and abnormal state by using a steady-state bias resistor. The application does not need external interlocking logic, and has the advantages of simple structure, low cost, high reliability, high enough isolation degree under low frequency, effective satisfaction of the demand of the low-frequency MRI system on the high isolation degree and fast response of the TR switch, and remarkable reliability effect on the MRI nuclear magnetic system and the communication field with a frequency below 300MHz.

Disclosed herein is a medical system comprising: a memory storing machine executable instructions; a computing system, wherein execution of the machine executable instructions causes the computing system to perform a misalignment check comprising: receiving pose identification system data, wherein the pose identification system data comprises a set of subject coordinates and a set of coil coordinates described using a current coordinate system, wherein the set of subject coordinates describes anatomical features of a subject, wherein the set of coil coordinates describes coil positions of magnetic resonance imaging coils, wherein coil data associated with the magnetic resonance imaging coils comprises a predefined range of coil positioning coordinates with reference to the anatomical features; determining an allowed range of coil coordinates by mapping the predefined range of coil positioning coordinates to the current coordinate system using the set of subject coordinates and the anatomical features; and providing a warning signal in the event of a misalignment between the set of coil coordinates and the allowed range of coil coordinates.

A portable magnetic resonance imaging system includes a handheld scanner, a limb scanner, and a data storage device. The handheld scanner includes a scan head and a handle attached to the scan head. The scan head is designed to be positioned adjacent a patient for magnetic resonance imaging. A first data cable is coupled to the handle of the handheld scanner. The limb scanner includes a housing that is open-ended and designed to receive a limb of a patient for magnetic resonance imaging. A second data cable is coupled to the limb scanner. The data storage device is connectable to the first data cable and the second data cable.

The application discloses a kind of epilepsy lesion positioning method and system based on magnetic resonance imaging, applied to artificial intelligence and medical instrument technical field, its method includes: obtaining the MRI image of the brain of patient to be detected and pre-processing, obtain cortical partition statistical data;According to the cortical partition statistical data, the local cortical lesion mask of patient to be detected is labeled;The morphological characteristics of the lesion mask are extracted;The morphological characteristics are input into the classification model for identification, and the epilepsy lesion is positioned;A new brain feature not used for child epilepsy identification is applied in the application, and the corresponding brain area of the contralateral hemisphere of the hemisphere where the patient lesion is located is used as a control, which can effectively improve the accuracy of the model, and improve the detection rate of MRI negative child epilepsy patients.

The present disclosure is directed a magnetic resonance apparatus with a scanner unit, a patient receiving area at least partially surrounded by the scanner unit, wherein the scanner unit includes an enclosure at least partially surrounding the patient receiving area, and a patient support apparatus with a patient table, wherein the patient table is embodied to move horizontally within the patient receiving area, wherein the magnetic resonance apparatus comprises a cleaning unit for cleaning the enclosure surrounding the patient receiving area, wherein the cleaning unit is at least partially arranged on the patient table.