272results 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 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 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 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.

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.

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.

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.

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.

A safety device for a magnetic resonance imaging device has a connecting portion which is configured to be coupled, in an intended use state, to a patient support and / or guide rail for the patient support of the magnetic resonance imaging device. The safety device further has at least one flatly extending shield portion forming a substantially closed shield surface at least in a line of sight normal to its surface extent, and at least one articulating portion which is arranged between the shield portion and the connecting portion or a further portion and which is configured to enable a rotational adjustment of the shield portion or further portion, preferably about two mutually perpendicular articulation axes.

The invention relates to a method for providing position information of an object (120) with a three-dimensional magnetic field strength sensor (125, 126) in the vicinity of a device (100) generating a magnetic stray field, comprising: providing (40) B0 reference data of the magnetic stray field at least along a first spatial direction, wherein the first spatial direction is orthogonal to a second spatial direction and a third spatial direction, and wherein the B0 reference data is provided along the first spatial direction at a predefined position in the second and third spatial directions; arranging (41) the magnetic field strength sensor (125, 126) of the object (120) at the predefined position; providing (42) a measured value of the magnetic field strength sensor (125, 126) at the predefined position;Providing (43) position information of the object (120) in the first spatial direction based on the B0 reference data and the measured value.;

A system for assisting in guiding and performing a procedure on a subject is disclosed. The subject may be any suitable subject, such as a non-living subject and / or a living subject.

A medical system (100, 300) is disclosed that includes a memory (110) storing machine executable instructions (112) and a pulse sequence database (114). The pulse sequence database includes a magnetic resonance fingerprinting pulse sequence (604, 1000, 1002). Execution of the machine executable instructions causes the computing system (104) to: receive (200) calibrated breathing data (116) describing a plurality of breathing phases of the subject (322); identifying (202) the breath-holding data portion (118); identifying (204) an active breathing data portion (120); determining (206) a subject-specific breath-holding duration (122) using the breath-holding data portion; determining (208) a subject-specific active breathing duration (124) using the active breathing portion; and selecting (210) the selected magnetic resonance fingerprinting pulse sequence (126) and the selected magnetic resonance fingerprinting dictionary (128) from the pulse sequence database using the subject-specific breath-holding duration and the subject-specific active breath duration.

This disclosure provides a system for preparing a patient for examination in a medical magnetic resonance imaging (MRI) environment. The system includes: a magnetic resonance imaging unit (20) applied to the MRI environment and including at least one magnetic coil controlled to provide magnetic stimulation to intentionally stimulate nerves and / or muscles of a peripheral body part of the patient during the examination phase; and a first device (10) applied during a patient preparation phase prior to the examination phase; wherein the MRI unit (20) and the first device (10) are configured to provide tactile communication with the patient by intentionally stimulating nerves and / or muscles of a peripheral body part of the patient, wherein the first device (10) includes: at least one stimulation unit (11) adapted to act as a proxy for the MRI unit (20) by simulating subsequent magnetic stimulation from the MRI unit (20) as proxy electrical stimulation and / or proxy magnetic stimulation, and to operate separately from the magnetic stimulation from the MRI unit, and by applying stimulation by a means different from the magnetic stimulation from the MRI unit. The system includes an electrical stimulation and / or magnetic stimulation to intentionally stimulate nerves and / or muscles in the peripheral body parts of the patient; and at least one data processing unit (12) adapted to control the at least one stimulation unit (11) to apply the electrical stimulation and / or the magnetic stimulation, wherein at least one patient stimulation threshold is assigned to the proxy electrical stimulation and / or the proxy magnetic stimulation, and the at least one data processing unit (12) is also adapted to correlate the at least one patient stimulation threshold associated with the proxy electrical stimulation and / or the proxy magnetic stimulation with a corresponding threshold assigned to the magnetic stimulation used in the medical magnetic resonance imaging environment, and to provide control parameters for applying the subsequent magnetic stimulation by the magnetic resonance imaging unit (20) based on the correlation; wherein the at least one data processing unit (12) is also adapted to provide tactile interaction information data and / or tactile interaction instruction data associated with the proxy intentional stimulation via a user interface to train the patient for tactile communication during a subsequent examination phase.

The invention provides an electromagnetic muscle shaping instrument, a magnetic field intensity control method and equipment thereof, a medium and a product, and relates to the technical field of electromagnetic shaping. The electromagnetic muscle shaping instrument comprises an LC oscillating circuit and a variable power supply, wherein the variable power supply is electrically connected with the LC oscillating circuit; the magnetic field intensity control method of the electromagnetic muscle shaping instrument comprises the following steps: acquiring an actual capacitance value of a capacitor in an LC oscillating circuit in real time; calculating a charging voltage target value according to the actual capacitance value and the target magnetic field intensity; and controlling the variable power supply output voltage based on the charging voltage target value. By adjusting the charging voltage output by the variable battery, the electromagnetic energy attenuated along with the decrease of the aging capacity of the capacitor is compensated in real time, so that the magnetic field intensity can be accurately controlled at the target magnetic field intensity. Because the compensation control of the magnetic field intensity is carried out for the capacitor aging, the control precision of the magnetic field intensity is ensured.

Disclosed is a magnetic resonance imaging, MRI, phantom (100, 200, 300, 400, 500, 700), the magnetic resonance imaging phantom (100, 200, 300, 400, 500, 700) comprising: at least one phantom portion (102, 104, 106, 108, 110, 112, 604); and at least one phantom-portion specific switchable shielding portion (114, 116, 118, 120, 122, 124, 606), wherein the at least one switchable shielding portion is configured to be switchable between a blocking, resonant state and a transparent, non-resonant state respective to an MRI frequency range.