876results about "Magnetic variable regulation" patented technology

The invention relates to the field of magnetic field generation, and discloses a multi-mode array magnetic field generation system and method. The single excitation source matrix excitation comprises an FPGA main control chip and a DDS signal generation module, a DDS chip reads a signal waveform stored in an ROM, a keying module is combined with a PLL clock signal module and an amplification circuit, signals with adjustable amplitude, frequency, phase and duty ratio are achieved, excitation is applied to an array coil through bipolar D / A conversion to generate magnetic fields of different modes, and the magnetic fields of different modes are generated. The Hall magneto-dependent sensor is combined to adjust the angle and direction of the generated magnetic field in real time, and the focusing angle of the magnetic field is dynamically changed. The array coil is excited by generating a plurality of current signals with different amplitudes, frequencies, phases, duty ratios and directions, and the Hall magneto-dependent sensor above the coil is combined, so that the energy and direction of an array magnetic field are controllable, the magnetic field generation efficiency is improved, and the detection target is enhanced.

Systems and methods for ascertaining a performance value of an MRT system including where a reference frequency distribution of reference deposition values of examined reference objects is received. At least one examination deposition value for an MRT examination of at least one examination object is received by the MRT system. The performance value of the MRT system is ascertained using the reference frequency distribution and the at least one examination deposition value.

The invention provides a geomagnetic compensation and bias magnetic field generation system and method for cold atom interference. The system comprises a triaxial magnetometer, a triaxial Helmholtz coil, a voltage-controlled current source and an FPGA regulation and control module. The three-axis magnetometer is used for collecting space magnetic field data at a plurality of monitoring positions in the space where the three-axis Helmholtz coil is located in real time; the FPGA regulation and control module is used for calculating control voltage data required by the voltage-controlled current source according to a target magnetic field and any space magnetic field data collected by the three-axis magnetometer in each sampling period, controlling coil current transmitted to the three-axis Helmholtz coil, and outputting the coil current to the three-axis Helmholtz coil. And loop iteration is carried out until the three-axis Helmholtz coil generates a target magnetic field at a plurality of monitoring positions, wherein the target magnetic field is a near-zero magnetic field in the X / Y direction, and the magnetic field intensity in the Z direction is constant and is a non-zero value. The device can respond to the change of the environmental magnetic field in real time, and provides a stable and accurate magnetic field environment for the cold atom interference test on the basis of compensating the influence brought by the geomagnetic field.

In an method for detecting a closed loop in MRI: 3D coordinates of key characteristic points of an MRI examination subject are acquired; the 3D coordinates of the key characteristic points are adapted to a 3D body standard model, to obtain a 3D virtual body model of the examination subject; 3D surface regions of pre-designated body parts are extracted from the 3D virtual body model; based on pre-defined body parts where skin contact is likely to occur, a distance between 3D surface regions of two body parts in each body part pair are calculated; and in response to the distance between the 3D surface regions of the two body parts in any body part pair being less than a preset first threshold, a risk of a closed loop in the examination subject is determined.

The invention relates to a method for determining the position of a body part in a magnetic resonance imaging (MRI) system, the method comprising the following steps: positioning the body part on a body part cushion on a patient table (4) of the MRI system; determining a magnetic stray field with a magnetic field sensor (2) arranged in or on the body part cushion to thus determine position data; transmitting the position data to an evaluation unit by means of a transmission means; determining the position of the body part in the MRI system based on the position data and the fact that the body part is positioned on the body part cushion, by means of the evaluation unit. The invention further relates to a corresponding method for determining a specific absorption rate of a body part in a MRI system, a body part cushion, and a MRI system.

The purpose of the present invention is to provide a magnetic resonance imaging apparatus and a method for controlling a refrigerator. The magnetic resonance imaging apparatus increases the operating rate of an MRI apparatus by prolonging the replacement life of the refrigerator and reducing the replacement frequency of the refrigerator. And executing a cold head life prolonging mode. In the cold head life extension mode, regardless of the temperature of the superconducting coil, the displacer of the refrigerator is moved at a constant frequency lower than a predetermined upper limit frequency, and the drive frequency of the compressor drive unit adjusted by the compressor inverter is controlled in accordance with the temperature of the superconducting coil.

A portable magnetic resonance (MR) imaging system is disclosed, including a housing including an array of magnets, a radio frequency (RF) coil assembly, a RF power amplifier, a primary control circuit and a safety control circuit. The RF power amplifier is configurable from a default configuration to an enabled configuration. The system can further include a thermocouple positioned to monitor a temperature.

The invention relates to an MR surface coil with a heat dissipation element, a system comprising an MR surface coil, a patient table, and a magnetic resonance device. The MR surface coil comprises at least one RF antenna for transmitting and / or receiving RF signals, at least one electronic component electrically connected to the at least one RF antenna, a housing within which the at least one RF antenna and the at least one electronic component are arranged, and at least one heat dissipation element thermally connected to the at least one electronic component, wherein the at least one heat dissipation element is configured to dissipate heat energy from the at least one electronic component to the outside and / or to distribute it over a surface.

A portable magnetic resonance (MR) imaging system is disclosed, including a housing including an array of magnets, a radio frequency (RF) coil assembly, a RF power amplifier, a primary control circuit and a safety control circuit. The RF power amplifier is configurable from a default configuration to an enabled configuration. The system can further include a thermocouple positioned to monitor a temperature.

The invention relates to an unbalance constraint-based ampere-turn adjuster and a coordination system thereof, which comprise an execution coil group, an execution controller, a first detection module and a communication module, generate a corresponding matching strategy according to a matching request, analyze a response magnetic field waveform to generate a relative position coordinate, and send the relative position coordinate to the execution controller. A deviation evaluation algorithm is configured for calculating a deviation vector corresponding to the actually measured magnetic field deviation, and when the deviation vector meets a static correction condition, a static correction strategy is executed to generate a deviation allocation instruction so as to adjust a control signal of a corresponding target ampere-turn adjuster; and when the deviation vector meets a dynamic correction condition, executing a dynamic correction strategy to generate a position correction instruction so as to correct the relative position coordinates corresponding to the target ampere-turn adjuster. Through introduction of the magnetic field distribution sub-model and the feedback execution sub-system, the efficiency and precision of magnetic field adjustment are further improved, and accurate adjustment is realized in a complex magnetic field environment.

Provided are a nuclear magnetic resonance imaging apparatus and a body movement information processing method capable of detecting and classifying a body movement of a subject. A nuclear magnetic resonance imaging apparatus includes: an imaging unit (20) that measures a nuclear magnetic resonance signal generated by a subject and that acquires an image of the subject; and a body movement information processing unit (10) that includes a processor and that processes movement information of the subject disposed on an imaging apparatus, in which the body movement information processing unit includes a body movement information calculation unit (13) and a body movement information classification unit (15), and the processor receives a signal from a measurement device (30) that measures the movement information of the subject and calculates body movement information from the signal, and classifies the body movement information.

Systems and methods are disclosed for increasing a nuclear spin polarization in a target compound. Nuclear spin polarization can be increased by obtaining the target compound or a precursor of the target compound. The target compound or precursor can include a first proton and a second proton sharing a singlet spin order and a third proton coupled at least to one of the first proton or the second proton. A target atom can be coupled to at least the third proton. The precursor can be placed within a mean magnetic field strength below 500 mT. A magnetic resonance (MR) pulse sequence can be applied to the precursor. the MR pulse sequence configured to transfer population from the first and second protons to the target atom, thereby imparting a non-equilibrium nuclear spin polarization of at least 1%, 2%, 5%, 10%, or 20% to the target atom.

The invention discloses a fluid magnetization control method and circuit, and relates to the technical field of fluid magnetization, and the method comprises the following steps: obtaining a molecular structure of a fluid; calculating the acting force and mass of fluid molecules according to the molecular structure of the fluid; calculating the vibration frequency according to the acting force and the mass of the fluid molecules; setting an electromagnetic field generating device according to the vibration frequency; the electromagnetic field generating device generates an electromagnetic field to magnetize the fluid. The acting force and the mass of fluid molecules are calculated, then the vibration frequency needed by an electromagnetic field is calculated, the electromagnetic field generating device is arranged according to the vibration frequency, the electromagnetic field is generated to enable the fluid molecules to generate resonance, the heat value of fluid combustion is increased, the viscosity of fluid is reduced, and therefore the combustion efficiency of the fluid is improved.

A camera image of a subject placed on a table for subject transport of an imaging apparatus is acquired, and the camera image is used to present an optimal disposition of equipment to be mounted on the subject from the viewpoint of image quality. Next, a camera image of the subject on which the equipment is mounted is used to determine / predict safety, such as whether or not there is a collision or entanglement between the mounted equipment or the like and a structure of the imaging apparatus or the like, and whether or not a clearance with a bore can be maintained even after the mounting, and a result is presented to an operator.

The invention discloses a magnetic resonance imaging pulse and breath composite gating method based on breath guidance. The method comprises the following steps: acquiring face video data of a subject; carrying out skin region identification to obtain a corresponding region of interest; calculating a pixel mean value to obtain an original IPPG signal; removing head artifacts; determining a respiratory cycle T1 and a pulse cycle T2, and calculating a ratio N of the respiratory cycle T1 to the pulse cycle T2; determining a breathing time interval corresponding to each pulse cycle; the delay time d of the IPPG signal peak relative to the electrocardiosignal R wave peak is determined; calculating a composite gating time interval for magnetic resonance imaging in each pulse cycle; and generating a composite gating signal for triggering the MRI equipment to carry out magnetic resonance imaging. Through skin area recognition, effective head motion artifact removal and fine synchronous control over the pulse and the respiratory cycle, image artifacts are reduced, and the quality and efficiency of MRI imaging are remarkably improved.

The disclosure relates to a modular video playback system for use in a magnetic resonance device. The video playback system comprises a display module with a respective display unit for a left and right eye of the patient, each display unit including a display, a support arrangement for holding the display at a distance from the head laterally, and an optical arrangement fastened to the support arrangement at least partially in front of each respective eye for projecting an image output by the display onto the patient's eye. The video playback system also includes a holder that may be detachably connected to the display module and has fastening means for detachably fastening to at least one component of the patient table, a data transmission arrangement which can be connected to the display module, and a power supply arrangement which can be connected to the display module.

In a general aspect, a magnetic resonance system performs magnetic resonance measurements. In some examples, a magnetic resonance system includes a data processing device and a superheterodyne spectrometer system. The data processing device generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress a mirror sideband in the magnetic resonance control signal. The superheterodyne spectrometer generates a magnetic resonance control signal based on the digital IF signal information.

The invention belongs to the technical field of fluid magnetization, and particularly relates to a fluid magnetization treatment method and system.The fluid magnetization treatment system comprises a controller and a processor, the processor comprises a shell, two connectors are installed on one side of the shell, an adapter is installed on the other side of the shell, a coil bin is formed in the inner wall of the shell, and a coil is arranged in the coil bin; the coil is electrically connected with a controller through an adapter, a U-shaped oil way pipe is installed in the shell, and fuel flows in the oil way pipe. Fuel oil is magnetized through an alternating magnetic field, fuel oil molecules are attracted to vibrate along with alternating of the magnetic field, the internal energy of the fuel oil molecules is improved, the fuel oil molecules are in a quasi-excitation state, and therefore the combustion efficiency and the combustion degree of the fuel oil are improved, meanwhile, the distance between the fuel oil molecules in high-frequency vibration is increased, atomization is more sufficient during atomization, combustion is facilitated, and the fuel oil is more environmentally friendly. And the combustion efficiency of the fuel is further improved.

Disclosed is a sterile MRI probe infusion device for preparing and administering a hyperpolarized MRI probe to a patient in need thereof. The device includes one or more reaction chambers, where a hyperpolarized MRI probe is prepared, separated from the reaction mixture, concentrated, and a solution of suitable concentration for administration to a patient is prepared. Also disclosed is a method of preparing and administering a hyperpolarized MRI probe by the use of the device to a patient in need thereof for diagnosing stages of a disease or an adverse condition or monitoring progress of a treatment of the patient having a disease or an adverse condition.

The magnetic resonance imaging (MRI) device comprises a magnet unit, a patient table, and a patient position detection device. The magnet unit surrounds a patient acquisition area defined by an inner wall of the magnet unit and includes a whole-body coil. The patient table is movable within the patient acquisition area. The patient position detection device comprises a sensor unit, a determination unit, and a verification unit. The sensor unit is designed to determine the patient's position on the patient table. The determination unit is designed to determine the distance between the patient and the inner wall based on this position information. The verification unit is designed to check the patient's positioning against a distance limit based on this distance.

In a local coil arrangement (5) for use on a patient bed (1) with a magnetic field sensor (6) for measuring the main magnetic field of a magnetic resonance device (16) in order to determine position information of the local coil arrangement (5) by comparison with a main magnetic field map, the following sequence of steps is proposed to check the correct function of the magnetic resonance sensor in a procedure: - Recording of the first measured value (12) of the magnetic field sensor (6) outside the patient recording (2) at the first measuring position of the local coil arrangement (5) at a first lying position (4) of the patient bed (1) and determination of the first position information, - Recording of a second measurement (15) of the magnetic field sensor (6) during or after completion of a movement of the patient bed (1) into the patient receptacle (2) at a second measurement position (13) of the local coil arrangement (5) at a second position (14) of the patient bed (1), which is different from the first measurement position (9) and is located in particular within the patient receptacle. - Determination of at least one reference value that describes the expected main magnetic field at the second measurement position (13), which is determined from the first position information and the displacement distance of the patient bed (1) between the first and the second bed position (4, 14) according to the position determination device (18), and - Determination of error information indicating a potential measurement error by comparing the second measured value (15) with the reference value.

The invention relates to quantum MRI (Magnetic Resonance Imaging) equipment for rapid and intelligent scanning for cerebral hemorrhage conversion detection, which belongs to the technical field of medical instruments and comprises a scanning bed, an MRI scanning coil support is fixed at the upper end of the head of the scanning bed, a quantum coding disc is arranged in the middle of the support, a patient self-adaptive fixing device is mounted at the top of the bed, and the side edge is connected with a control system signal acquisition module. The quantum coding disc is connected with the support through a deep groove ball bearing and is driven by a mechanical transmission device. The patient self-adaption fixing device comprises a pressure sensor array, an image recognition camera, a mechanical clamping arm and a flexible fixing pad. The device uses the quantum coding disc to perform fast coding, combines the patient adaptive fixing device to reduce image artifacts, can adapt to different patients, significantly improves the detection efficiency and the image quality, integrally controls the device through the central controller to realize intelligent automatic operation, effectively solves the problems that the traditional MRI detection time is long, the image is susceptible to interference and the like, and improves the detection efficiency and the image quality. And an efficient and accurate solution is provided for cerebral hemorrhage conversion detection.

In a method for monitoring absorption of a transmitter output irradiated into a patient by a transmitter unit of a magnetic resonance device, absorption data is provided, which describes a patient-nonspecific, location-dependent absorption sensitivity of the transmitter output to be irradiated. The patient is positioned in an irradiation region of the magnetic resonance device, in which the irradiation of the transmitter output into the patient is to take place. An anatomy of the patient is detected in the irradiation region, and the absorption data is assigned to the anatomy of the patient. A magnetic resonance scan of the patient is then performed, wherein the transmitter output absorbed by the patient is monitored during the magnetic resonance scan based on the absorption data assigned to the anatomy of the patient.

A method for generating a magnetic resonance (MR) image in the presence of an interventional device that induces distortions is provided. The method includes using a processor to perform steps that include accessing a distorted MR image of a subject with the interventional device arranged in the subject. The steps also include using the distorted MR image to determine parameters of a set of spatially differentiable functions that describe an estimated position of the interventional device in the subject. The steps further include determining a magnetic susceptibility map based on susceptibility properties of the interventional device and the estimated position of the interventional device. The steps also include generating a simulated MR image by modifying a reference image of the subject based on the magnetic susceptibility map and updating the estimated position using the simulated MR image to generate an updated position of the interventional device in the subject.

The present invention relates to a device for reducing MRI-induced RF heating in active implantable medical device (AIMD) leads, particularly spinal cord stimulator leads. The device incorporates an air-core transformer to increase inductance within the lead system, significantly reducing RF coupling and localized heating at the electrode-tissue interface during MRI procedures. The transformer features a primary coil formed by the lead and a secondary coil embedded in a biocompatible toroidal bobbin, which doubles as an anchoring mechanism. The bobbin securely holds the lead while maintaining flexibility for implantation. Anchoring is achieved through shape-memory retaining pins that adapt upon deployment, ensuring positional stability. This innovative design enhances MRI compatibility without compromising AIMD functionality, providing a safer and more effective solution for managing chronic pain and other neurological conditions. By addressing both lead stability and RF heating, the device supports safer imaging for AIMD patients.

The invention relates to a device for inserting a sample (E) into a sealed enclosure (1), the device comprising: - a sample carrier (10) for holding the sample; - an insertion rod (7) comprising an elongate portion (8) suitable for bearing the sample carrier (10); - a transfer airlock (14) comprising: - an outer door (20) intended to close in a watertight manner and to open onto an environment (M) outside the sealed enclosure; - an inner door (21) intended to close in a watertight manner and to open onto the inside of the sealed enclosure; - a sealed chamber (19) defined between the outer door and the inner door when they are in the sealed configuration, the sealed chamber being configured to accommodate the sample carrier inserted by the insertion rod; - a system for purifying the contained fluid medium, the sample carrier and the sample which are accommodated in the sealed chamber.

A medical device for performing electroacupuncture to treat traumatic brain injury and cerebral thrombosis is disclosed. The device comprises a 6-DOF (degree of freedom) mechanical arm, a multifunctional tool tip, an MRI helmet suitable for acupuncture and moxibustion and magnetic resonance imaging (MRI). The acupuncture robot is capable of automatically manipulating some needles by inserting the needles, rotating or shaking within a specific frequency range, and applying electrical stimulation to enhance the effect.

A polarization device comprising: a spin exchange optical pump for hyperpolarizing a noble gas, the spin exchange optical pump comprising a magnetic field coil arrangement configured to provide a static uniform magnetic field used by the spin exchange optical pump within a static uniform magnetic field region; and a storage holder for storing the hyperpolarized noble gas output from the spin exchange optical pump in a gas phase, the storage holder being located outside the oven of the spin exchange optical pump and inside the static uniform magnetic field region, and providing a corresponding storage space for storing and holding the hyperpolarized noble gas generated by the spin exchange optical pump.

A cushion element for a local coil, comprising a body which is reversibly connectable to the local coil and is designed to align a portion of the local coil relative to an anatomical structure of a patient when the cushion element is connected to the local coil in a predetermined manner when the local coil is positioned as intended.