443results about "Magnetic variable regulation" patented technology

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.

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.

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.

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.

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.

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 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 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.

Systems and methods are provided for managing and reducing the severity or impact of a collision involving an apparatus secured to a table associated with a medical imaging and / or therapeutic gantry. Example systems are provided in which an apparatus is secured to the table such that a distal region of the apparatus extends beyond a longitudinal end of the table. A pivot joint associated with the apparatus is provided such that when a collision between the distal region of the apparatus and an object occurs due to motion of the table, the resulting force causes the apparatus to rotate relative to the pivot joint, thus passively accommodating the applied force and preventing, or reducing the likelihood of, mechanical buckling of the apparatus in the presence of the force. In some example embodiments, the apparatus is configured to rotate and / or translate as a result of the force applied during the collision.

The invention discloses a plant growth acceleration method and system based on electromagnetic field regulation, and the method comprises the steps: collecting plant growth environment parameters, plant physiological parameters and electromagnetic interference parameters in real time through a multi-dimensional sensor network, and carrying out the noise reduction and normalization processing, and constructing a dynamic database; dynamically identifying the plant growth stage based on a preset growth stage threshold and a machine learning model; calling a single-field basic parameter library according to a plant growth stage, and dynamically calculating a synergistic effect parameter and a compensation strategy of an electrostatic field and a magnetic field in combination with an electromagnetic interference parameter; a three-dimensional vector electrostatic field and an anti-interference magnetic field are output in a time-sharing superposition mode, and an effective operating distance is adjusted and maintained through a self-adaptive electrode; based on the plant growth condition, an optimization algorithm is adopted to carry out iterative optimization on the electromagnetic field parameters; the problems that in the prior art, a plant growth regulation and control technology is single in electromagnetic field regulation and control means and lacks a multi-field cooperative dynamic regulation and control mechanism are solved.

Embodiments of the present disclosure provide for systems and methods of making, processing, and purifying hyperpolarized fluid samples and fractions thereof as well as detecting and using the hyperpolarized fluid samples. The present disclosure provides for methods and systems of making hyperpolarized fluid sample (e.g., hyperpolarized target molecules), which can be analyzed using a nuclear magnetic resonance (NMR) detection device.

The invention relates to the technical field of magnetic resonance compatibility, and discloses a method for setting a magnetic resonance compatible position of equipment, a storage medium and a related device. The method comprises the following steps: S100, acquiring the real-time magnetic field intensity of three axes of the position of the equipment through a three-axis magnetic field sensor; s200, comparing the real-time magnetic field intensities of the three axes with boundary magnetic field intensities of the three axes of boundary points of the safety area respectively, judging whether the real-time magnetic field intensities of the three axes are smaller than the boundary magnetic field intensities of the three axes of any boundary point respectively, if not, sending alarm information to a user, judging the magnetic field lowering direction according to the real-time magnetic field intensities, and sending the alarm information to the user. The magnetic field lowering direction is indicated on a display interface of the equipment, and a user is guided to move the equipment towards the magnetic field lowering direction. Through the method, a doctor can be guided to move the equipment to a safe area which does not interfere with the nuclear magnetic resonance imager every time the equipment is used, and the situation that the diagnosis process is affected due to the improper position of the equipment is avoided.

A method and a system for thermally or hyperthermally treating an object. A precipitating hydrophobic injectable liquid (PHIL) embolic agent is prepared and enhanced with a magnetic nanoparticle (NP). A delivery device is advanced to a target area and the PHIL−IONP embolic agent is injected directly at the target area. The PHIL and IONPS are observed in-situ using complementary imaging and an impulse is applied to the target area to generate heat sufficient to thermally ablate or induce hyperthymia at the target area. Additional impulses applied to the target areas at later times generate heat sufficient to ablate or induce hyperthymia at the target.

The invention concerns a handheld mobile device for determining a safety hazard due to magnetic fields, in particular a mobile phone, comprising a sensor unit comprising at least one magnetic field sensor and a position sensor; wherein the magnetic field sensor is configured to measure a magnetic field vector of an environment of the handheld mobile device; wherein the position sensor is configured to measure a position information of the handheld mobile device; a processing unit configured to calculate magnetic field data based on the measured magnetic field vector and the position information, wherein the magnetic field data comprises at least one of a strength of a magnetic field, magnet field gradient, a magnetic force, and electromagnetic induction, and determine whether the handheld mobile device is in a range of a magnetic fringe field of a Magnetic Resonance system based on the calculated magnetic field data. The invention further concerns a method for determining a safety hazard due to magnetic fields for a handheld mobile device, in particula2r a mobile phone.

A safety system for policing a doorway comprising a door to an MRI room.

The application belongs to the technical field of fluid magnetization, and particularly relates to a fluid magnetization treatment method and system, which comprises a controller and a processor. The processor comprises a shell, two connecting heads 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, a coil is arranged in the coil bin, the coil is electrically connected with the controller through the adapter, a U-shaped oil line pipe is installed in the shell, and fuel flows in the oil line pipe. The application magnetizes fuel through an alternating magnetic field, attracts fuel molecules to vibrate along the alternating magnetic field, improves the internal energy of the fuel molecules, makes the fuel molecules in a quasi-excitation state, thereby improving the combustion efficiency and combustion degree of the fuel, and the distance between the fuel molecules with high-frequency vibration is increased, so that the fuel is atomized more fully when atomized, combustion is facilitated, and the combustion efficiency of the fuel is further improved.

The invention relates to a body part pillow (5), in particular a head pillow (11), for supporting a body part, in particular the head (12), during a magnetic resonance examination with a magnetic resonance device (1), wherein the body part pillow (5) has at least one presence sensor (6) for detecting presence data related to the presence of the body part and a communication device (8) for transmitting the presence data to a receiver (9).

The utility model relates to the technical field of single-chip microcomputers, in particular to a nuclear magnetic resonance spectrometer circuit based on a single-chip microcomputer, which comprises a bottom box, a circuit chip is mounted in the bottom box, circuit break protectors are mounted on the left side and the right side of the circuit chip, pins are uniformly mounted on the outer sides of the circuit break protectors, and the circuit break protectors are connected with the bottom box. A top box is installed on the upper side of the bottom box, a temperature sensor is installed on the rear side of the top face of the top box, heat dissipation holes are evenly formed in the middle of the top face of the bottom box, waterproof breathable films are arranged in the heat dissipation holes, and a controller is installed on the front side of the top face of the bottom box. Heat dissipation fins are arranged on the top face of the bottom box and located on the front side and the rear side of a heat dissipation hole, a circuit breaker protector, a temperature sensor and a controller can enable the single-chip microcomputer not to run any more in an automatic circuit disconnection mode when the single-chip microcomputer is overheated, and therefore heat generated by the single-chip microcomputer due to overwork can be reduced, and the service life of the single-chip microcomputer is prolonged. And the service life of the single-chip microcomputer is longer.

The refrigeration unit of the magnetic resonance imaging system is used for cooling equipment of the magnetic resonance imaging system. A magnetic resonance imaging system includes a plurality of cooling conduits provided in its device. The refrigeration unit comprises a cold source (10) and a pipeline unit. The cold source (10) is capable of cooling a cooling fluid flowing through its conduit. The pipeline unit can distribute cooling fluid output by the cold source (10) to inlets of the multiple cooling pipelines according to a set proportion, and can distribute cooling fluid output by the multiple cooling pipelines to an inlet of the cold source (10) and an inlet of at least one cooling pipeline according to a set proportion. The refrigeration unit is favorable for reducing the cost. In addition, the invention also provides a magnetic resonance imaging system comprising the refrigeration unit.

Provided are methods for characterizing cellular metabolism in a subject through a repeated exposure approach of administering HP pyruvate to a subject. The methods described may be used for determining the efficacy of cancer therapy or for monitoring disease progression in the subject.

A patient table includes: a movable top plate (130A); a leg portion (130B) that supports the top plate; a signal conversion unit that is disposed inside the top plate and includes an A / D converter (160) and an electrical-to-optical converter (164) which convert a signal obtained from a receive coil unit (200) into an optical signal; an optical cable that transmits the optical signal output from the signal conversion unit; and an optical wireless unit (150) that is disposed on the leg portion, that is connected to the optical cable, and that transmits the optical signal via optical wireless communication, in which the optical wireless unit is disposed at a position that is hidden beneath the top plate in a case where the top plate is at an initial position before moving into an imaging space and that is exposed on the leg portion as the top plate moves into the imaging space.