73results about "Measurements using NMR" patented technology

The invention discloses a nuclear magnetic resonance passive shimming module design method and device based on Gaussian splashing, and relates to the technical field of precision electromagnetic field optimizing.The nuclear magnetic resonance passive shimming module design method comprises the steps that initialization is conducted in a design domain of a passive shimming module, and an initial parameter set of all Gaussian splashing particles is obtained; constructing a mapping relation between the equivalent magnetic moment and the magnetization weight factor of each Gaussian splashing particle and between the intrinsic magnetization intensity and the scaling vector of the magnetic material, and constructing a magnetic field intensity calculation model; inputting the initial parameter set of all Gaussian splashing particles and the real magnetic field intensity into a Gaussian splashing particle parameter set iterative optimization algorithm, and calculating and predicting the magnetic field intensity through a magnetic field intensity calculation model; and based on the predicted magnetic field intensity, the real magnetic field intensity, the magnetization weight factor vector and the center position vector, constructing a multi-objective loss function and performing iterative optimization to obtain an optimized parameter set and manufacture a passive shimming module. The method solves the problem of low precision and efficiency of compensating a magnetic field with a complex shape.

The invention discloses a security check stand column ferromagnetic detection system for a nuclear magnetic resonance room, which comprises a ferromagnetic detection device, a door opening detection device and an alarm device, and is characterized in that the ferromagnetic detection device and the door opening detection device are arranged close to a door of the nuclear magnetic resonance room; the door opening detection device is electrically connected with the ferromagnetic detection device; the ferromagnetic detection device comprises a magnetic field induction assembly and a signal processing assembly, the output end of the magnetic field induction assembly is electrically connected with the input end of the signal processing assembly, and the magnetic field induction assembly sends a magnetic field change signal to the signal processing assembly; the signal processing assembly comprises a band-pass filtering and amplifying unit, and the band-pass filtering and amplifying unit is used for performing amplification, high-frequency filtering and low-frequency filtering coupling processing on the magnetic field change signal to obtain a processing signal; and the alarm device is electrically connected with the signal processing assembly and is used for acquiring and identifying the processing signal and carrying out alarm work according to an identification result, so that the probability of metal leak detection or false detection is effectively reduced.

Described herein are compact MRI systems having (i) an open, field-cycling magnet configured to produce and cycle between a first and second non-uniform B0 different from the first non-uniform B0, and (ii) a second component configured to produce a nonlinear spatial encoding gradient. Importantly, the open, field-cycling magnet and the spatial encoding gradients are customized to a specific imaging application. In particular, the second component contains one or several nonlinear DC gradient coils for spatial encoding. It also contains one or several a radiofrequency coils geometrically configured to have a non-planar configuration. Lastly, both the RF coils and DC encoding gradients are tailored specifically to the first non-uniform B0 magnetic field, the second non-uniform B0 magnetic field, or both. Artificial intelligence models trained to read imaging data can be incorporated as a component of the MRI systems. Also described are methods of using the disclosed MRI systems.

The invention provides a method and a system for determining diamond nitrogen vacancy color center intrinsic transverse relaxation time. The method comprises the following steps: acquiring a transverse relaxation time calibration value of a standard nitrogen vacancy color center diamond sample; respectively measuring the first transverse relaxation time and the second transverse relaxation time of the standard nitrogen vacancy color center diamond sample and the nitrogen vacancy color center diamond sample to be detected under the action of the non-uniform external magnetic field on the detection platform; according to the transverse relaxation time calibration value and the first transverse relaxation time, calculating the transverse relaxation time deviation of the standard nitrogen vacancy color center diamond sample under the action of the non-uniform external magnetic field; and according to the transverse relaxation time deviation and the second transverse relaxation time, calculating the intrinsic transverse relaxation time of the nitrogen vacancy color center diamond sample to be measured. According to the method and the system, an ultrahigh-uniformity static magnetic field environment with extremely high cost is not needed, the detection method is high in robustness, and the calibration accuracy of the to-be-detected sample in a complex or non-ideal experimental environment can be remarkably improved.

A method is provided for increasing a measurand, said measurand being associated with the exposure of probe spins to a sample magnetic field generated by precessing sample spins. The method comprises providing a solid comprising spin systems localized therein, said spin systems providing the probe spins, said probe spins having an average position. The method comprises providing a sample in a sample region, the sample comprising said sample spins, and said sample having a sample average position. The method comprises applying a static magnetic field to the sample region, the static magnetic field having a component being spatially homogeneous in the sample region, said component acting along a first direction, said static magnetic field causing the sample spins to precess. A distance between the sample average position and the average position of the probe spins does not exceed one millimeter, such that the probe spins are exposed to a sample magnetic field generated by the precessing sample spins. The method comprises, while the static magnetic field is being applied to the sample region: applying a pulsed magnetic field to the sample region, the pulsed magnetic field having a component along the first direction, wherein a gradient of said component of the pulsed magnetic field has a component perpendicular to at least one of the first direction and a relative sample position, wherein the relative sample position refers to a vector difference resulting from subtracting the average position of the probe spins from the sample average position. The method further comprises, while the static magnetic field is being applied to the sample region: measuring a measurand that is associated with occupations of quantum mechanical states of the probe spins. Said gradient has a magnitude, said magnitude referring to a time integral of said component of the gradient over a temporal period of the pulsed magnetic field. The method is characterized in that the magnitude is such that the measurand is increased by at least 25% over a reference measurement of the measurand, the reference measurement being performed like said measurement except for the applying of the pulsed magnetic field, wherein the pulsed magnetic field is not applied in the reference measurement.

The invention discloses a low-field NMR relaxation time rapid measurement method, and the method comprises the steps: designing an IR-bSSFP pulse sequence which comprises a 180-degree reversal pulse and an excitation pulse sequence, and enabling the flip angle of a radio frequency excitation pulse in the excitation pulse sequence to be a pseudo-random flip angle; the radio-frequency phases of the adjacent radio-frequency excitation pulses are linearly changed by a fixed phase increment; based on the IR-bSSFP pulse sequence, obtaining a component MRF signal sequence of a measured object, and simulating a magnetization vector evolution process to obtain a dictionary matrix; matching the component MRF signal with a dictionary matrix pattern in combination with a smooth constraint term to obtain corresponding longitudinal relaxation time and transverse relaxation time; the invention also discloses low-field NMR relaxation time rapid measurement equipment, which comprises a pulse sequence construction module, a dictionary generation module and a mode matching module. Multi-parameter information can be obtained through single scanning, the measurement time is remarkably shortened, the experiment complexity is reduced, and the precision and repeatability of a measurement result are improved.

The application discloses a kind of background field wide-range adjustable ultra-low field nuclear magnetic resonance measuring device, and a kind of background field wide-range adjustable ultra-low field nuclear magnetic resonance measuring method is also disclosed, the present application adopts flat solenoid to realize high background magnetic field requirement and ultra-low ambient magnetic field, flat solenoid can also accommodate more coil and obtain more turns, realize more extensive background field adjustable range;Flat solenoid both ends are stretched outside magnetic shielding module, which can ensure that the magnetic flux line at the end of flat solenoid is connected outside the shielding area, eliminating the problem of background field inhomogeneity generated by ordinary solenoid coil;The present application can eliminate the interference of ambient magnetic field by passive magnetic shielding and active magnetic field compensation, first, the ambient magnetic field is shielded by multiple electromagnetic shielding cylinders, and then the magnetic field opposite to the ambient magnetic field is generated by the shim coil to actively compensate the magnetic field, to offset the interference of ambient magnetic field;The shim coil can also improve the uniformity of the central magnetic field.

The utility model provides a water leakage early warning device for magnetic resonance equipment and the magnetic resonance equipment. The water leakage early warning device comprises a water pressure collector and a water cooling system connected to the magnetic resonance equipment, and the water pressure collector is used for collecting a first water pressure signal of the water cooling system; the digital display meter is electrically connected to the water pressure collector and receives the water pressure signal from the water pressure collector, and the digital display meter is configured to display the first water pressure signal and analyze the first water pressure signal into a second water pressure signal; the remote unit is in communication connection with the digital display meter and receives a second water pressure signal from the digital display meter; and the remote terminal is in communication connection with the remote unit and receives the second water pressure signal from the remote unit. The remote terminal can monitor the water pressure of the water cooling system in real time, delay does not exist, and once the water pressure exceeds a normal range, the water pressure can be observed in time, so that remedial measures can be taken as soon as possible.

A radio frequency coil and a resonance assembly for a magnetic resonance imaging system are provided. The radio frequency coil has a first end and a second end in an axial direction, the radio frequency coil including: a first conductor portion at the first end, the first conductor portion including a first arc-shaped conductor and a second arc-shaped conductor opposed in a radial direction; and a second conductor portion at the second end; the second conductor portion including a third arc-shaped conductor and a fourth arc-shaped conductor opposed in the radial direction; wherein the first arc-shaped conductor and the third arc-shaped conductor are opposed in the axial direction, and the second arc-shaped conductor and the fourth arc-shaped conductor are opposed in the axial direction, and there are no rung conductors directly connected between the first conductor portion and the second conductor portion.

A method for generating a property representation of a substance is described. The method comprises: obtaining portions of one or more nuclear magnetic resonance (NMR) data of the substance, where each NMR data portion comprises one or more NMR datasets, each NMR dataset comprising intensity data and relaxation data; processing each NMR data portion into a multi-dimensional distribution of a fitting data set by performing a plurality of fits of a function, where the function includes at least 3 fitting parameters; and generating a characteristic representation of the substance from the fitting data set. The processing includes applying at least one initial guess value. Each set of fitting data comprises data embedded with at least one subset of fitting data comprising an apparent longitudinal relaxation time (T1 *), an associated apparent transverse relaxation time (T2 *) and an associated intensity (M0), preferably said function being a function of a model representing the obtained NMR data portion.

The utility model discloses a coil auxiliary support frame for magnetic resonance examination, including the support of arch shape and with the matching coil, the both sides of support are equipped with the support leg for supporting support, the support leg includes the horizontal pole rotatablely connected with the one end of support and the telescopic vertical pole connected with the one end of horizontal pole away from support and telescopic, the vertical pole includes the sleeve pipe connected with horizontal pole and the telescopic rod can be worn into sleeve pipe, the end of sleeve pipe is equipped with the nut, and the telescopic rod is equipped with the outer thread matched with nut. The telescopic rod is equipped with two or more than two along the length direction distribution's mark. The support is equipped with the spacing block of limiting horizontal pole rotation range. The utility model has the following beneficial effect: through telescopic vertical rod height adjustment, can adapt to the height of different examination site, through horizontal pole 90 degrees outward rotation to adjust the width of coil auxiliary support frame, to adapt to the width of different examination site, makes the coil maximum limit close examination site, to improve the image quality.

The application relates to a magnetic resonance scan control method, a graphical user interface device system and a magnetic resonance imaging system. An initial positioning image of a magnetic resonance scan is acquired, and an excitation region of a metabolite of interest is selected in the initial positioning image of the magnetic resonance scan. An auxiliary mark is displayed on or around the excitation region of the metabolite of interest, and the auxiliary mark is associated with scan parameters. According to the auxiliary mark, an excitation region of an interfering metabolite is determined. It is judged whether the excitation region of the interfering metabolite exists. If the excitation region of the interfering metabolite does not exist, the magnetic resonance scan is performed by using the scan parameters; otherwise, the auxiliary mark is adjusted until the excitation region of the interfering metabolite does not exist. The magnetic resonance scan control method improves data quality and optimizes the problem that an interfering metabolite is excited due to a chemical shift effect.

The invention provides a magnetic signal enhancement device and a magnetic resonance imaging system.The magnetic signal enhancement device comprises a dielectric substrate, a first coil assembly and a second coil assembly, the first coil assembly is arranged on the dielectric substrate and comprises a plurality of first coils arranged in a first plane to form a first array, and the second coil assembly comprises a plurality of second coils arranged in a second plane to form a second array; the first array has a first arrangement direction and a second arrangement direction which are intersected; the second coil assembly is arranged on the dielectric substrate and comprises at least one second coil arranged in a second plane, and the second plane is parallel to the first plane; the projection of the first coil in the first plane and the projection of the second coil in the first plane are partially overlapped along the first arrangement direction and the second arrangement direction. According to the invention, the uniformity of the magnetic field distribution of the area where the whole magnetic signal enhancement device is located can be improved, and the enhancement uniformity of the magnetic signal enhancement device on the magnetic signal in the target area can be improved.

The invention provides a magnetic resonance parameter determination method and device, electronic equipment and a computer program product, and the method comprises the steps: scanning a scanning object through employing a plurality of gradient echo sequences of different repetition times, and obtaining a magnetic resonance image corresponding to the gradient echo sequence of each repetition time; the radio frequency flip angles set by the plurality of gradient echo sequences are the same; performing nonlinear fitting according to a plurality of different repetition times, a radio frequency flip angle set by the gradient echo sequence, the signal intensity of each magnetic resonance image and a preset signal model to determine a longitudinal relaxation time constant, the independent variables of the signal model including the repetition time and the longitudinal relaxation time constant, the dependent variable of the signal model is the signal intensity of the magnetic resonance image. Therefore, the gradient echo sequences with the same flip angle and different repetition times are adopted for scanning, and nonlinear fitting is performed based on the steady-state signal model, so that the longitudinal relaxation time constant can be quickly and accurately determined without long waiting time.

A power supply assembly of a gradient coil is provided. The power supply assembly of the gradient coil may include a first insulation device(400), wherein the first insulation device(400) is located within a scanning channel(301) of a main magnet (300) and connected to one end of the gradient coil(600), the first insulation device(400) may be arranged with a first conductive unit(401), the conductive unit(401) may be a rigid conductor, a first end of the first conductive unit(401) may be electrically connected with the gradient coil(600) of a magnetic resonance imaging system, and a second endof the first conductive unit(401) may be electrically connected with a cable(100) of the magnetic resonance imaging system.

The nuclear magnetic resonance system can include: a set of magnets, a housing, a set of coils (e.g., receive coil, transmit coil, gradient coil, active shim coil, etc.), and a processing system. The nuclear magnetic resonance method can include: applying a pulse sequence, acquiring a signal, and processing the signal (e.g., to determine blood analyte levels).

The invention relates to an imaging apparatus (1) which comprises: - at least a first module (36) comprising a trolley (38) provided with a plate (39) on one face of which rests a magnetic assembly (1A) intended to apply a main magnetic field in an analysis zone (22) of a main housing (16) of the magnetic assembly (1A), the trolley (38) additionally comprising two side walls (40, 41) supporting the plate (39) via one of their edges, designated the upper edge; - a second module (37) of substantially parallelepipedal shape, supporting a set of electronic control elements, the console being in particular configured to be inserted between the side walls of the trolley (38); the console and the first module comprising means of identification, by the console, of the geometric and magnetic features of the magnetic assembly (1A) of the first module, the means of identification being integrated in connection means.

The present disclosure relates to a modular magnetic resonance imaging device comprising an assembly of a plurality of modules (100) connected to one another, the shape and / or size of the modules being adapted to the shape of the assembly, each module (100) being adapted to conduct an electric current to generate a magnetic field and having a first structural part (106) assembled with a second structural part (102), the first structural part having a groove (202) separating the modules into at least two different conductive regions.

The invention provides a magnetic signal receiving device and a magnetic resonance imaging system, the magnetic signal receiving device comprises a dielectric substrate, a plurality of first coils and a second coil, the dielectric substrate extends in a first plane, and the plurality of first coils are arranged in the first plane to form a first array; the second coil surrounds the periphery of the first array and is used for being electrically connected with an external circuit so as to provide an output electric signal for the external circuit. According to the invention, the magnetic signal can be enhanced while the magnetic signal is received and the second coil is utilized to output the induction electric signal, and the enhancement uniformity of the magnetic signal is improved.

A nuclear spin and / or electron spin resonance excitation and detection element (1) for in-situ nuclear and / or electron spin resonance spectroscopy in a Transmission Electron Microscope (TEM) comprising: - a body part (3), wherein the body part (3) is configured for receiving a sample (23) on or within the body part (3); and - an electrical circuit (5), preferably a resonator circuit, configured for emitting an electromagnetic excitation signal and for receiving an electromagnetic response signal from a sample (23) on or within the body part (3), wherein the electrical circuit (5) is arranged on or within the body part (3).

A method of measuring petrophysical information from a crushed porous media including performing one or more NMR measurements on the porous media fully submerged in an NMR visible fluid, performing one or more NMR measurements on the porous media alone following centrifugation, performing one or more NMR measurements on the porous media after rinsing with a NMR invisible fluid, and analyzing the NMR measurements to extract a petrophysical property.

Influence of RF noise and external magnetic field on the image quality of a portable magnetic resonance imaging (MRI) system (1) are to be avoided. This is achieved by providing a system and a computer-implemented method for determining an optimized position and / or orientation of a portable MRI system (1) for an MR imaging process in a medical environment (2), comprising at least one RF noise sensor (3), wherein the RF noise sensor (3) is configured for measuring RF noise in the medical environment (2) and to provide sensor data, at least one magnetic field sensor (4), wherein the magnetic field sensor (4) is configured to measure the external magnetic field in the medical environment (2) and to provide sensor data, a processor unit (5), wherein the sensors (3, 4) are connected to the processor unit (5), the processor unit (5) comprising at least one memory (6) for storing instructions, at least one processor (7) configured to execute the instructions to cause the following to be performed: measuring RF noise and the external magnetic field in the medical environment by means of corresponding sensors (3, 4), evaluating the sensor data and creating spatial distributions of the measured RF noise and / or the measured external magnetic field in the medical environment (2), determining a position and / or orientation of the portable MRI system (1) in the medical environment (2) for an MR imaging process based on the spatial distributions of the measured RF noise and / or the measured external magnetic field.

The application discloses a coil binding device and method. The device comprises a binding assembly, a guiding assembly and a pressure sensor. The binding assembly comprises a first binding assembly arranged at a first end of a flexible coil and a second binding assembly arranged at a second end of the flexible coil. The guiding assembly comprises a first guiding slot arranged at a first long side of a bearing assembly and a second guiding slot arranged at a second long side of the bearing assembly. The bearing assembly is used for bearing an object to be detected. The first guiding slot cooperates with the first binding assembly under the action of a pulling force. The second guiding slot cooperates with the second binding assembly under the action of a pulling force. The pressure sensor is arranged at a contact surface of the flexible coil and the object to be detected, and is used for detecting the pressure of the flexible coil on the object to be detected. A controller is used for controlling the pulling force of the first guiding slot on the first binding assembly and the pulling force of the second guiding slot on the second binding assembly according to the pressure of the flexible coil on the object to be detected. The application solves the technical problem that the flexible coil in a magnetic resonance system cannot be automatically bound.

A magnetic resonance imaging (MRI) device is disclosed that includes: a frame assembly; a magnet assembly that is supported by the frame assembly and which is configured to generate a primary magnetic field; and shim magnets that are configured to generate an ancillary magnetic field, which supplements the primary magnetic field. The shim magnets are adjustably supported by the frame assembly such that the shim magnets are repositionable in relation thereto in order to increase uniformity of the primary magnetic field.

The application discloses a nuclear magnetic resonance probe system and relates to the field of nuclear magnetic resonance analysis. In the nuclear magnetic resonance probe system, a radio frequency signal heating current synthesizer is connected with a radio frequency signal heating current separator in a cavity through a single cavity interface; the radio frequency signal heating current separator is connected with a radio frequency coil and a heating system; the radio frequency coil is wound outside a sleeve; the heating system is wound outside the radio frequency coil; the sleeve covers a target core; the cavity is located between two magnets; the radio frequency signal heating current synthesizer combines a radio frequency signal and a heating current; the single cavity interface transmits the combined mixed signal to the radio frequency signal heating current separator; the radio frequency signal heating current separator separates the radio frequency signal from the mixed signal and transmits the radio frequency signal to the radio frequency coil, and separates the heating current from the mixed signal and transmits the heating current to the heating system; the radio frequency coil receives the nuclear magnetic resonance signal of the oil and water displaced in the target core. The application can improve the reliability and thermal efficiency of the system and reduce the cost of the system.