137 results about "Cerebral mri" patented technology

A system includes an image data processor for automatically processing data representing multiple patient anatomical images acquired in a single imaging scan. The images are acquired by, identifying multiple different anatomical elements in corresponding multiple different anatomical regions and identifying multiple different potentially pathology indicative features associated with the multiple different anatomical elements in response to first predetermined information associating different potentially pathology indicative features with corresponding different anatomical elements. The image data processor determines multiple different image acquisition methods for use in imaging the multiple different potentially pathology indicative features in response to second predetermined information associating different image acquisition methods with corresponding identified different pathology indicative features. An output processor collates images for output.

The invention discloses an individualized target positioning method based on weight function connection. The method comprises the following steps: S1, performing structural magnetic resonance and resting-state functional magnetic resonance scanning on a patient without magnetic resonance contraindication to obtain structural magnetic resonance and resting-state functional magnetic resonance data;S2, carrying out scale evaluation of mild cognitive impairment on the patient, and determining scores of different dimensions of a scale; S3, preprocessing the resting-state functional magnetic resonance data; S4, determining a deep brain region and a surface contact brain region which need to be intervened; and S5, in combination with the score of the cognitive assessment scale, calculating the maximum weight function connection of the functional connection between the deep brain region related to cognition and the brain region of interest, and determining the point of the brain region of interest corresponding to the maximum weight function connection as an individualized stimulation target of transcranial magnetic stimulation. The method solves the problem that repeated transcranial magnetic stimulation can only be focused on the surface of the brain and cannot stimulate deep brain tissue.

The invention discloses a cervical vertebra flexed position magnetic resonance imaging fixing device. The device comprises a head-neck cushion, a chest-back cushion and backup plates, wherein magnetic resonance imaging coils are respectively embedded in the neck cushion, the chest-back cushion and the backup plates. The device is characterized by comprising a rotating shaft, a telescopic air cylinder, a bottom plate and a flexion supporting device; the front end of the head-neck cushion is hinged to the chest-back cushion through the rotating shaft; the scanning coil backup plates are respectively arranged on two sides of the head-neck cushion; the bottom plate is arranged at the lower part of the neck cushion; the flexion supporting device is arranged on the bottom plate; one end of the bottom plate is connected with the chest-back cushion, and the other end of the bottom plate is fixedly connected with the telescopic air cylinder; a guide slide way is arranged in the center of the bottom plate; the flexion supporting device comprises a supporting wedge block, a rolling shaft and a supporting foot; the rolling shaft is arranged on the inclined front surface of the supporting wedge block; a guide rail is arranged on the lower bottom surface of the supporting wedge block; a support roller is arranged on the rolling shaft; the inclined rear surface of the supporting wedge block is fixedly connected with the telescopic air cylinder; the inclined front surface of the supporting wedge block is in contact with the head-neck cushion; the lower bottom surface of the supporting wedge block is connected with the guide slide way. The device has the advantages of novel structure, convenience in scanning, high image quality and the like.

The invention applies to the field of clinical medicine and provides a focusing target adjusting system, method and device for magnetic resonance-guided focused ultrasound. The system comprises: a magnetic resonance scanning chamber, a scanning bed positioned in the magnetic resonance scanning chamber, a longitude probe moving guide fixedly connected to the front end of the scanning bed, a latitude probe moving guide perpendicularly and slidably connected to the longitude probe moving guide, an ultrasonic array probe slidably connected with the latitude probe moving guide, a magnetic resonancescanner slidably connected with the scanning bed, a human-machine interaction terminal positioned outside the magnetic resonance scanning chamber, a master industrial personal computer connected withthe human-machine interaction terminal, and a signal controller connected with the ultrasonic array probe, the magnetic resonance scanner and the master industrial personal computer. A fixed coordinate conversion relationship is established between the ultrasonic array probe and magnetic resonance images through the system, so that a focused target can be precisely adjusted through position shiftand phase adjustment of array elements of the ultrasonic array probe, and deep brain nerves are controlled.

The embodiment of the invention discloses a magnetic resonance imaging method, a device thereof and equipment and a storage medium. The method comprises the following steps: 1, determining a preset scanning protocol according to a to-be-scanned part corresponding to a scanning object, wherein the preset scanning protocol comprises an overall protocol and at least two affiliated single bed protocols corresponding to the overall protocol, the overall protocol is associated with each corresponding affiliated single bed protocol through preset scanning parameters, the overall protocol is used forcontrolling overall scanning positioning of each bed, and the affiliated single bed protocols are used for controlling single bed scanning positioning of a single bed; adjusting at least one scanningparameter in the preset scanning protocol according to the scanning object information, and generating a target scanning protocol; and performing scanning positioning according to each overall protocol in the target scanning protocol, and performing magnetic resonance scanning on the target scanning protocol to generate a magnetic resonance image of the scanned object. By means of the technical scheme, the large-range magnetic resonance scanning protocol can be planned more efficiently, and the magnetic resonance imaging efficiency and the image splicing quality are improved.

The invention provides a method for measuring a fetal corpus callosum volume by using magnetic resonance imaging, and a magnetic resonance imaging apparatus. The method comprises the following steps:acquiring a positioning image of a to-be-detected fetus through magnetic resonance imaging; determining a detection area P according to the position of fetal corpus callosum in the positioning image,wherein the detection area P comprises the fetal corpus callosum; carrying out magnetic resonance scanning on the detection area to obtain a diffusion weighted image of the detection area, wherein a gradient direction during the magnetic resonance scanning only needs to be applied to a direction parallel to the extension direction of the fiber bundles of the corpus callosum; intercepting a fetal head image in the diffusion weighted image; applying a preset threshold to the fetal head image to obtain high signals with brightness greater than a threshold in the image; and carrying out bunching processing on the high signals, taking the maximum bunch in the high signals as corpus callosum, calculating the sum of the sizes of voxels related to the high signal of the maximum bunch, and taking the sum as the volume of the corpus callosum.

The invention discloses a method for removing magnetic resonance head image motion artifacts.. Non-reference image qualitative assessment indexes QITV in the method are used for reflecting image quality. The method comprises the steps of constructing k space data after sampling each time through contraction perception, calculating QITV value of reconstructed images, by observing the change trend of the image QITV value, finding the time when patients make motion in the magnetic resonance screening process, and using k space data without motion to reconstruct contraction perception so as to optimize fully-collected motion artifact images. The image quality of the magnetic resonance motion artifacts can be effectively improved, so that clinical application of magnetic resonance images can bepromoted.

A method is provided for monitoring a current respiratory curve of a patient with regard to a recording region which is imaged by magnetic resonance scanning. The method includes acquiring a reference respiratory curve of the patient over a plurality of respiratory cycles; establishing a respiration state of the patient that is suitable for the magnetic resonance scanning based on the reference respiratory curve; determining at least one reference recording time window and a trigger threshold value for starting a magnetic resonance scan based on the previously determined respiration state; carrying out at least one magnetic resonance scan within the determined reference recording time window of the current respiratory curve using the trigger threshold value; and continually acquiring and monitoring the current respiratory curve during the magnetic resonance scan in the reference recording time window.

The invention discloses an augmented reality system for assisting an examinee to adapt to a magnetic resonance scanning environment, and the system comprises: positioning equipment which is used for providing position information; a virtual reality engine which is used for receiving the position information and presenting a virtual picture; eye movement and head movement acquisition equipment which is used for monitoring eye movement and head movement conditions of a subject in real time; and a biofeedback calculation system which is used for receiving the feedback condition of the eye movement and head movement acquisition equipment, automatically adjusting the virtual picture and automatically adjusting the closeness degree with the magnetic resonance environment according to the behavioral performance of the subject. By utilizing a biofeedback technology and an augmented reality technology, children, people with mild claustrophobia and mental disease patients gradually adapt to a magnetic resonance imaging environment, the retention time is prolonged, the anesthesia use frequency is reduced, the anxiety of children guardians is relieved, and the magnetic resonance scanning quality and the working efficiency are improved.

The invention belongs to the technical field of magnetic resonance scanning imaging, and provides a quick imaging model training method and device, and a server. The method comprises the steps: carrying out the undersampling of an image obtained through magnetic resonance scanning according to an undersampling mask during each model iterative training, and obtaining training data; inputting the training data into a quick imaging model, performing feature extraction on the training data through N multi-granularity attention modules according to multi-scale information and an attention mechanismof an image, and fusing feature maps extracted by each multi-granularity attention module; carrying out image reconstruction on the fused feature map, and outputting imaging data; reversely calculating a gradient according to the imaging data and a target label so as to update parameters of the quick imaging model and the under-sampling mask through the gradient; and carrying out forward calculation by adopting the updated parameters and the under-sampling mask. According to the embodiment of the invention, the problems that the under-sampling mask cannot be optimized and the imaging effect is poor are solved.

The invention discloses a magnetic resonance imaging method and device and a storage medium. The method comprises the following steps of: in each period, applying 180-degree radio frequency pulse, applying a gradient echo sequence, and applying a first fast spin echo sequence, the number of repetition times of the period being not less than 1; and generating a T1 weighted image according to the data acquired by the gradient echo sequence, and generating a cerebrospinal fluid suppressed T2 weighted image according to the data acquired by the first fast spin echo sequence. According to the method, the gradient echo sequence is applied after the 180-degree radio frequency pulse is applied and before the first fast spin echo sequence is applied, T1 weighted image data is acquired by utilizing idle time between a turnover recovery pulse and an excitation pulse required for generating the cerebrospinal fluid suppressed T2 weighted image, and the magnetic resonance scanning time for generating the T1 weighted image and the cerebrospinal fluid suppressed T2 weighted image is shortened.

The invention discloses a method, system and equipment for detecting asymmetry of left and right hemispheres of a brain as well as a storage medium, and relates to the field of image processing. According to the method, magnetic resonance scanning data of the brain of each detected individual are acquired and processed to obtain quantitative nuclear magnetic resonance data of the brain of each detected individual, the average value of the quantitative nuclear magnetic resonance data in target brain area ranges of left and right hemispheres is extracted according to a mask matrix, a lateralization index is calculated by using the average value, and detection of the asymmetry of left and right hemispheres of the brain is conducted according to the lateralization index to obtain a detection result. Detection of the asymmetry of left and right hemispheres of the brain of each individual is conducted by the quantitative nuclear magnetic resonance method, the asymmetry of left and right hemispheres of the brains of different detected individuals is analyzed quantitatively from a microstructure perspective, and the detection accuracy is improved.

The invention relates to an automatic rapid visualization method for resting state brain function connection. According to the invention, through analysis of brain functional magnetic resonance imaging data, functional images are automatically acquired, and data analysis is automatically completed; and brain network connection strength information obtained through analysis is automatically returned to PACS, so a user can conveniently retrieve and read the brain network connection strength information at any time. The automatic rapid visualization method provided by the invention makes up a technical support blind area of conventional medical magnetic resonance scanning equipment, and enriches biological information indexes for medical technicians to refer to, so the comprehensiveness and objectivity of a clinical diagnosis or intervention evaluation link are improved.

The invention discloses a conch holographic digital modeling preparation method comprising the following steps: carrying out spiral CT scanning on the whole conch shell, and performing modeling to obtain a conch shell model; carrying out magnetic resonance scanning on soft tissues of a movement system, soft tissues of a digestive system and soft tissues of a nervous system in the conch and then modeling to obtain a conch soft tissue model; synchronously adjusting the conch shell model and the conch internal soft tissue model to achieve fitting of complete spatial positions among different structures to obtain a conch overall model; then defining colors for different structures by referring to the colors of the tissues of the living conch; and then carrying out transparency adjustment, so that each model can achieve three-dimensional visual visibility to obtain a three-dimensional anatomical model of the conch, the three-dimensional anatomical model of the conch is imported into different scenes to be displayed, and the three-dimensional anatomical model can be imported into a color 3D printer to print a solid model for display and training teaching.

The invention discloses application of a cardiac magnetic resonance imaging (MRI) examination technology. The cardiac magnetic resonance imaging technology includes an electrocardiographic synchronization technology and a respiratory synchronization technology; the selection of cardiac magnetic resonance scanning layers includes cross-sectional imaging, coronal plane imaging, vertical plane imaging, a left ventricle long axis position, left anterior oblique position and left ventricle short axis position parallel to the ventricular septum, and a left ventricle long axis and four-chamber heartposition perpendicular to the ventricular septum; and a cardiac vessel scanning sequence includes magnetic resonance cardiac cine imaging, helical scanning and cardiac examination impulse sequence. The MRI examination technology has the advantages of comprehensively providing the guidance use flows of MR model Siemens Aera1.5T and cardiac MR model GE750w, and being simple and easy to understand.

A magnetic resonance scanner has a base, a C-arm mounted on said base, the C-arm having an inner surface curved in a C-shape, the C-shape defining a plane, a magnet mounted on said inner curved surface of said C-arm, the magnet generating a basic magnetic field for magnetic resonance imaging, and a drive mechanism mechanically connected to the magnet. The drive mechanism rotates the magnet around an axis that is orthogonal to said plane so as to selectively position said magnet in at least two magnet positions that are respectively above and beneath a patient, who is situated in the C-arm along or parallel to the axis.

The application relates to a magnetic resonance equipment temperature control circuit, system and method. The circuit comprises a digital module, an analog receiving chain module, a current control module and a first power supply module, and the analog receiving chain module comprises a second power supply module and a temperature monitoring module; the digital module is respectively connected with the temperature monitoring module and the current control module and is used for receiving the temperature data in the analog receiving chain module and determining a current adjustment strategy according to the temperature data and the magnetic resonance scanning sequence parameters; and the current control module is connected with the first power supply module and the second power supply module and is used for adjusting the first output current of the first power supply module and the second output current of the second power supply module according to the current adjustment strategy so asto enable the temperature to maintain a dynamic balance state within a first temperature range. By adopting the circuit, the temperature in the analog receiving chain module can be compensated, so that the temperature in the analog receiving chain module is kept constant.

The invention provides a building method and device of a blood vessel model and a readable storage medium, and relates to the technical field of medical imaging. The method comprises the steps of determining an initial blood vessel model according to a nuclear magnetic resonance scanning result of an artery vessel of a detection object, calculating first blood vessel wall displacement data of theinitial blood vessel model according to pulse pressure and the nuclear magnetic resonance scanning result of the detection object, determining second blood vessel wall displacement data of the arteryvessel according to the nuclear magnetic resonance scanning result, and determining the blood vessel model of the detection object according to the first blood vessel wall displacement data and the initial blood vessel model if a difference between the first blood vessel wall displacement data and the second blood vessel wall displacement data is within a preset scope. Since the second blood vessel wall displacement data represents an actual blood vessel wall displacement situation of the artery vessel of the detection object, the blood vessel model of the detection object can be determined accurately according to the first blood vessel wall displacement data with the small difference from the second blood vessel wall displacement data, and the initial blood vessel model.

The present application discloses an automatic positioning system and method for human body transcranial ultrasound stimulation based on a mechanical arm. The system is used to automatically perform ultrasonic stimulation to a preset position of the head and comprises an input module, a spatial positioning module, an ultrasonic stimulation module, a safety ellipsoid determination module and a control module; the input module is used to input brain CT or magnetic resonance scan data of subjects; the spatial positioning module is used to obtain real-time three-dimensional coordinate informationof the head and to obtain real-time three-dimensional coordinate information of the ultrasound stimulation module; the safety ellipsoid determination module is used to determine a safety ellipsoid that surrounds the entire head and forms a predetermined safe distance from an outer surface of the head; and the control module is used to control a multi-degree-of-freedom mechanical arm to drive a ultrasound transducer coupling device to move, so that the ultrasonic transducer coupling device and the head form a fit contact at a preset position of the scalp. The automatic positioning system and method have advantages of high spatial accuracy and high reliability.

The invention discloses a magnetically-compatible transcranial electric stimulation device. A wireless communication mode is adopted, and through a wireless communication docking station connected toa control room computer, transcranial electric stimulation is carried out in a magnetic resonance imaging scanning room and bidirectional communication with the control room computer is realized; themagnetically-compatible transcranial electric stimulation device mainly comprises four parts: the wireless communication docking station, a magnetically-compatible transcranial electric stimulator, amagnetically-compatible electrode lead wire and a magnetically-compatible electrode; the magnetically-compatible transcranial electric stimulator can output current of +/-4mA, detects output current and electrode contact impedance in real time, carries out wireless communication, normally operates in a magnetic interference environment, does not interfere with a surrounding magnetic field environment, and is provided with a plurality of stimulation channels; and the magnetically-compatible electrode is formed by connecting carbon fibers to a rubber sheet. The device is reasonable in design, can be used in the magnetic resonance scanning room, and solves the problems that existing transcranial electric stimulation devices are difficult to realize magnetic compatibility, inconvenient to usein transcranial electric stimulation combined with magnetic resonance imaging, low in reliability and the like.

The invention provides a magnetic resonance scan magnetism field uniformity compensation auxiliary device, and relates to medical imaging examinations. When the magnetic resonance scan magnetism field uniformity compensation auxiliary device is used for scanning irregular body parts of necks and shoulders, upper limbs, wrist joints, palms, knee joints, ankle joints, wrist joints, feet and the like in magnetic resonance mode, partial space can be filled, geometrical morphology of the irregular body parts is changed, the number of interfaces between air and soft tissue is decreased, uniformity of a part of a magnetic field is improved, the body position can be fixed, occurrence probability of random motions is decreased during the scanning process, and therefore magnetic sensitive artifacts and motion artifacts are eliminated or alleviated, and simultaneously partial fat suppression effects can be obviously improved and reliable magnetic resonance images can be provided to clinical diagnosis. The magnetic resonance scan magnetism field uniformity compensation auxiliary device has the advantages of being capable of effectively solving the problems of serious artifacts and low fat suppression effects of the magnetic resonance scan images of the irregular body parts on the basis of not changing an existing scan device, an existing scan method, an existing scan sequence and existing scan parameters and not prolonging scanning time, obviously improving image quality, and increasing detection rate of diseases.

The embodiment of the invention discloses a magnetic resonance imaging method and system, and a storage medium. The method comprises the following steps of: determining a to-be-scanned position corresponding to a current spine positioning image; according to an oriented object of the to-be-scanned position, matching a scanning way for the to-be-scanned position; and controlling a scanning device to carry out imaging scanning on the to-be-scanned position according to the current scanning way to obtain a magnetic resonance image of the to-be-scanned position. By use of the method disclosed by the invention, the problem of low implementation efficiency of magnetic resonance scanning in the prior art is solved.

The invention belongs to the technical field of magnetic resonance imaging and application, and discloses a gradient coil and a gradient coil manufacturing method. The gradient coil comprises a main gradient coil and a shielding gradient coil which are connected with each other, each layer of coil in the main gradient coil and the shielding gradient coil is formed by winding a conductor, and at least one layer of coil in the main gradient coil and the shielding gradient coil is of a double-layer conductor structure. According to the double-layer conductor structure for the gradient coil, the generated gradient fields are coupled and superposed, so that the gradient intensity is 1.5-2 times higher than that of a single-layer coil under the condition of the same current, and the gradient coil can be used for some advanced sequence applications of magnetic resonance imaging. Besides, more coil design freedom degrees can be provided, through an optimized design algorithm, the double-layerconductor structure distribution can more accurately approach the ideal gradient current distribution, a more accurate gradient magnetic field can be generated, the higher gradient linearity can be achieved, and therefore a magnetic resonance scanning image is clearer and more accurate.