306results about "Measurements using NMR" patented technology

A magnetic resonance imaging system is presented, including: a magnetic resonance imager (302) comprising a superconducting magnet (304) surrounding a bore (306); a cooling system configured to cool the superconducting magnet through conduction cooling; a frame (520) rotatably supporting the magnetic resonance imager; an actuator configured to move the magnetic resonance imager in a plurality of predetermined examination positions between a horizontal orientation and a vertical orientation of a main static magnetic field associated to the superconducting magnet; and a patient support (320) configured to support a patient in any of the plurality of predetermined examination positions.

A system for saturating a core sample of rock includes a vessel with an inner surface defining a receptacle that receives and holds the core sample and a saturating fluid. The vessel defines an opening into the receptacle at a first end of the vessel. A piston is configured to fit within the opening and the receptacle and travels to seal the vessel. A pump directs hydraulic fluid to the piston, wherein the pump pushes the hydraulic fluid against the piston to maintain a saturation pressure within the receptacle to accommodate the saturating fluid filling pore throats within the core sample. The core sample may include bores that provide additional surface area subject to the saturation pressure. The system calculates a numeric permeability of the core sample and a measured permeability of the core sample while simultaneously saturating the core sample over a time period.

Described herein are systems and techniques for improving accuracies of determinations made using a nuclear magnetic resonance (NMR) sensing device when the NRM sensing device collects data in a wellbore. NMR sensing devices include a magnet that provides a magnetic field that aligns the spins of protons in substances near the NMR sensing device. The magnetic field strength provided by this magnet affects the sensitivity of the NMR sensing device and affects frequencies that the NMR sensing device effectively uses when the NMR sensing device operates. Furthermore, the field strength of magnets used in an NMR sensing device varies with temperature. Since temperatures within a wellbore vary significantly and since these temperatures affect how an NMR sensing device operates, systems and techniques of the present disclosure collect calibration data in a calibration chamber such that data sensed by the NMR sensing device can be interpreted more accurately when temperatures change.

The invention discloses an ultra-low field nuclear magnetic resonance measurement device with a large-range adjustable background field, and also discloses an ultra-low field nuclear magnetic resonance measurement method with a large-range adjustable background field. According to the ultra-low field nuclear magnetic resonance measurement device with the large-range adjustable background field, a flat solenoid is adopted to realize a high background magnetic field requirement and an ultra-low environment magnetic field; the flat solenoid can accommodate more coils and obtain more turns, so that a wider background field adjustable range is realized; two ends of the flat solenoid extend out of the magnetic shielding module, so that a magnetic flux line at the tail end of the flat solenoid can be connected to the outside of a shielding area, and the problem of non-uniformity of a background field generated by a common solenoid coil is solved; interference of an environmental magnetic field is eliminated through passive magnetic shielding and active magnetic field compensation, firstly, passive magnetic shielding is performed on the environmental magnetic field through a plurality of electromagnetic shielding cylinders, then a magnetic field opposite to the environmental magnetic field is generated through a shimming coil to perform active magnetic field compensation, and interference of the environmental magnetic field is counteracted; the shimming coil can also improve the uniformity of the central magnetic field.

The invention relates to a method of MR imaging of a body (10) of a patient positioned in an examination volume of an MR device (1). It is an object of the invention to provide a method that enables geometrically correct MR-only radiation therapy planning at minimum scan times. The method of the invention comprises the following steps: acquiring first MR imaging data representative of at least one region of the body (10); analyzing said first MR imaging data to delineate at least one anatomical structure within said body region; acquiring second MR imaging data of said body region using a multi-point Dixon sequence; deriving a B0 map from said second MR imaging data; analyzing said B0 map to determine at least one low fidelity region of said B0 map; performing B0 mapping to refine the B0 map using a multi-acquisition gradient echo sequence restricted to at least one region where said delineated anatomical structure and said low fidelity region overlap completely or partially; and correcting geometrical distortions in said first and / or second MR imaging data using the refined B0 map. Moreover, the invention relates to a MR device (1) for carrying out the method, and to a computer program to be executed on a MR device (1).

The invention discloses a nuclear magnetic resonance detection device, and belongs to the technical field of nuclear magnetic resonance detection equipment improvement, the nuclear magnetic resonance detection device comprises a nuclear magnetic resonance scanning machine body and a patient bed, a bed frame is slidably arranged on a bed base, airflow channel assemblies are arranged in two sides of the bed frame, and two blowing and sucking control assemblies are arranged on two sides of the bed base; the two blowing and sucking control assemblies are connected with the two airflow runner assemblies respectively, each airflow runner assembly comprises a high-speed runner and a low-speed runner which are arranged in parallel, runner openings of the high-speed runners and the low-speed runners are attached to the inner wall of the detection cavity, and the high-speed runners are closer to the detection cavity than the low-speed runners. The high-speed flow channel and the low-speed flow channel are communicated with one ends of air uniformizing cavities respectively, the other ends of the two air uniformizing cavities are communicated with one end of an airflow conveying pipeline respectively, the blowing and sucking control assembly comprises a blowing and sucking pump, and the other end of the airflow conveying pipeline is communicated with the blowing and sucking pump. According to the breathing mask, viruses carried by a patient during breathing can be removed, and cross infection and spreading of infectious diseases caused in the subsequent using process are avoided.

The invention relates to a magnetic resonance imaging (MRI) device (1) which is designed to image a substantially metallic component. The magnetic resonance imaging device comprises means (b '') for generating a polarized magnetic field intended to be applied to said component (a), radio frequency (RF) means (g) for exciting said component (a), detection means cooperating with antenna means for delivering a magnetic resonance imaging (MRI) signal, and means for processing said MRI signal for delivery with respect to said component (a) and a device for detecting feature information of the state. The component (a) is subjected to a very weak field of less than 10 mT, and the detection means comprise a pickup coil (h) magnetically coupled with the polarization means (b '') and the radio frequency means (g) and operating as a flux concentrator, and an SQUID (Superconducting Quantum Interference Device) detector arranged downstream of said pickup coil (h) via a transformer.

A ULT NMR probe is disclosed that comprises: a probehead for containing a sample and a sample coil near the center of field; a probe base at the end of the probe opposite the probehead comprising a vacuum chamber and multiple connections to fluid lines; a probe body between the probehead and the base; a counterflow first exchanger extending from the probehead through the body for cooling of a first spin gas, the first exchanger comprising first exchanger coolant inlet and first exchanger spin gas outlet located in the probehead; a coolant dewared line for ducting source coolant stream from the base into the probehead for distribution into the first coolant inlet; a counterflow second exchanger in the vacuum chamber, the probe characterized in that the first and second exchangers are series connected in the vacuum chamber; and an rf coil being in communication with fluid from the first spin gas outlet.

The invention discloses a low-field nuclear magnetic resonance exploration device and method capable of effectively shortening dead zone time, and relates to the field of electric signal acquisition, and the device comprises an upper computer which is used for communicating with a main control circuit; the main control circuit is used for controlling and collecting the core and comprehensively controlling the work of the device; the power amplification circuit is used for amplifying the power signal input by the main control circuit and then transmitting an alternating current pulse to excite the coil; the beneficial effects of the invention are that the coil employs a transmit-receive integrated differential structure, which inhibits common-mode noise interference and improves the signal-to-noise ratio of detection; the Q-conversion circuit reduces the quality factor of the coil through parallel connection of energy discharge resistors at the two ends of the coil, the purpose of rapidly discharging energy stored in the coil is achieved, and the dead time can be effectively shortened; the high-isolation fast-switching radio frequency switch can effectively reduce the insertion loss and the generated noise, significantly reduce the switching time, further shorten the dead zone time, and improve the detection effect of a short relaxation target body.

The invention provides an integrated deuterium-hydrogen double nuclear magnetic resonance coil, which comprises a barrel and a plurality of single-channel double-frequency coils, and is characterized in that the barrel is of a hollow barrel-shaped structure; a plurality of single-channel double-frequency coils are overlapped and laid on the outer surface of the cylinder in a surrounding manner; each single-channel double-frequency coil comprises a coil unit, a first capacitor C1, a second capacitor C2, an input and output matching circuit and a double-frequency switching circuit, the first capacitor C1 and the second capacitor C2 are connected to the coil unit in series, and the double-frequency switching circuit is connected to the two ends of the second capacitor C2 in parallel. And the input and output matching circuit is connected to the two ends of the first capacitor C1 in parallel so as to correspondingly match the input and output of the working frequencies of the two coils. According to the invention, the integrated deuteron and hydrogen core dual-frequency working mode switching is realized through the same wiring structure, and the mutual influence caused by repeated positioning of a plurality of coils and multi-structure nesting is avoided.

Chondrogenic potential of mesenchymal stem cells (MSCs) can be determined using magnetic resonance relaxometry by measuring T2 relaxation value of the MSCs.

The subject invention pertains to a method that involves at least three steps: (1) acquisition of a NMR data set or spin relaxation curve for plasma, serum or whole blood samples, (2) analysis of the NMR data or relaxation curve to extract the T2 relaxation times for water (or surrogates thereof), and (3) conversion of the water T2 (or surrogates thereof) into a measure of someone's health status (referred to as a T2 health score depending on the T2 value associated with the score). The T2 health score utilizes a statistical database derived from previous studies of subjects of normal, healthy individuals to those having varying degrees of hidden or subclinical metabolic abnormalities, such as inflammation, insulin resistance, lipid abnormalities (dyslipidemia), oxidative stress or other abnormalities, and provides a measure of a subject's overall health status.

Radiofrequency (RF) detection and acquisition system (1) which is based on SQUID and which is provided particularly to be integrated into a nuclear magnetic resonance (IRM or RMN) equipment item, comprising a primary detection antenna (5), a flux transformer (2) having an inlet winding (6) which is connected to the primary detection antenna (5), a low critical temperature SQUID device (3) which is provided to capture the magnetic flux produced by an outlet winding (8) of the flux transformer (2) and to supply a secondary detection signal, a cryogenic device provided to cool the SQUID device (3) and the flux transformer (2), and a step (4) of processing the secondary detection signal emitted by the SQUID device (3) in order to supply an analogue acquisition signal. The primary detection antenna (5) is of the volume type, comprising Helmholtz coils or saddle coils, or a more complex volume geometry, particularly gradiometric geometry, and the step (4) of processing the secondary detection signal comprises a flux-locked loop (FLL) which is provided to linearise the response of the SQUID device (3).

A method of determining a ratio of hydrogen to methane produced from a partially depleted shale gas reservoir comprising an organic nanopore system, an inorganic pore system, and a micro-fracture system, and housing stored hydrogen, comprises: obtaining a core sample from the reservoir, and subjecting the core sample to 1H Nuclear Magnetic Resonance (NMR) testing to obtain respective T2 and T1-T2 relaxation times for methane and for hydrogen in each one of the organic nanopore system, the inorganic pore system, and the fracture system.

A method for generating a characteristic representation of a substance is described. The method comprises: obtaining one or more portions of nuclear magnetic resonance (NMR) data of the substance, wherein each NMR data portion comprises one or more NMR data sets each comprising intensity data and relaxation data, processing each NMR data portion(s) into a multidimensional distribution of fitted data sets by performing multiple fittings to a function, wherein the function comprises at least 3 fitting parameter(s), and generating the characteristic representation of the substance from the fitted data sets. The processing comprises applying at least one start guess. Each fitted data set comprises data embedding at least one fitted data subset comprising an apparent longitudinal relaxation time (T1*), an associated apparent transverse relaxation time (T2*), and an associated intensity (M0), preferably the function is a function which represents a model of the obtained NMR data portion(s).

Disclosed herein is a magnetic resonance imaging (MRI) coil assembly comprising: a set of one or more quantum sensors and associated set of one or more radio frequency coils respectively, wherein each radio frequency coil of the set of one or more radio frequency coils is configured to perform radio frequency excitation in an object to be imaged for inducing a magnetic resonance signal from the object; wherein each quantum sensor of the set of one or more quantum sensors is configured to receive a signal induced by the magnetic resonance signal in the respective radio frequency coil and provide an optical signal representing the MRI signal through an optical link. The MRI coil assembly comprises an optical signal processing unit that is configured to receive through the optical links the one or more optical signals and to digitize the one or more optical signals.

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.

According to various embodiments, a magnetic resonance imaging system is provided. According to various embodiments, the system includes a housing having a front surface, a permanent magnet for providing a static magnetic field, a radio frequency (RF) transmission coil, and at least one gradient coil group. According to various embodiments, the RF transmission coil and the at least one gradient coil group are positioned close to the front surface. According to various embodiments, the RF transmission coil and the at least one gradient coil group are configured to generate an electromagnetic field in a region of interest. According to various embodiments, the permanent magnet has an aperture passing through its center. According to various embodiments, the region of interest is located outside the front surface.

The present invention relates to the technical field of bone density measurement, and in particular to a nuclear magnetic calibration phantom for bone density measurement, comprising a shell and a plug-in arranged inside the shell; the shell is filled with nuclear magnetic solution; the plug-in is a three-dimensional reticular structure, made of a material with no magnetic resonance signal but CT signal; the shell is made of a material with no magnetic resonance signal and no CT signal. The material of the plug-in is one or a combination of hydroxyapatite, calcium phosphate, calcium sulfate, and bioglass, and the density of the plug-in is 20-200 mg / cm3. This nuclear magnetic calibration phantom is used for the comparison of magnetic resonance bone density tests. The magnetic resonance bone density data of the plug-in is first calibrated using the results of the CT bone density test to ensure the accuracy of the comparison of the magnetic resonance bone density test results; it has the advantages of simple structure and convenient operation.

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.

Disclosed herein is a magnetic resonance imaging (MRI) coil assembly comprising: a set of one or more quantum sensors and associated set of one or more radio frequency coils respectively, wherein each radio frequency coil of the set of one or more radio frequency coils is configured to perform radio frequency excitation in an object to be imaged for inducing a magnetic resonance signal from the object; wherein each quantum sensor of the set of one or more quantum sensors is configured to receive a signal induced by the magnetic resonance signal in the respective radio frequency coil and provide an optical signal representing the MRI signal through an optical link. The MRI coil assembly comprises an optical signal processing unit that is configured to receive through the optical links the one or more optical signals and to digitize the one or more optical signals.

According to the invention, a magnetic resonance examination apparatus (2), with a magnetic field-generating unit (14) for generating a main magnetic field and a shim system (1) for enhancing the homogenization of the main magnetic field, the shim system (1) comprising a shim opening (12) and at least a first set of shim elements (4) and a second set of shim elements (6) which are individually insertable into the shim opening (12) by a shim set controller (7), wherein the first set of shim elements (4) is adapted for shimming a first main magnetic field with a first magnetic flux density generated by the magnetic field-generating unit (14) to uniformity when the first set of shim elements (4) is inserted into the shim opening (12), the second set of shim elements (6) is adapted for shimming a second main magnetic field with a second magnetic flux density generated by the magnetic field-generating unit (14) to uniformity when the second set of shim elements (6) is inserted into the shim opening (12), and the second magnetic flux density is different from the first magnetic flux density. In this way shim elements for reducing the effects of magnetic field inhomogeneities in magnetic resonance examination apparatuses are provided.

The invention relates to a shielding coil, a receiving and transmitting integrated coil, magnetic resonance scanning equipment and a magnetic resonance system, the shielding coil is applied to the magnetic resonance scanning equipment, and a first diode is arranged on the shielding coil; the first diode disconnects the access of the shielding coil under the condition that the receiving coil in the magnetic resonance scanning equipment is in a working state, so that the shielding coil is in a non-working state; and when the receiving coil is in a non-working state, the access of the shielding coil is conducted, so that the shielding coil is in a working state. The shielding coil provided by the invention can reduce the image of the receiving coil and improve the signal-to-noise ratio of the receiving coil.

A Two-Field-NMR spectrometer for performing field-cycling NMR relaxometry experiments comprises a high field superconducting NMR magnet system for generating a homogenous magnetic field parallel to a z-axis in a central region of the spectrometer for polarization of an NMR sample and for detection of NMR signals; a low field magnet system generating a variable homogenous magnetic field; a magnetic tunnel connecting the center of the high field magnet system with the low field magnet system; and a shuttle system designed for shuttling the NMR sample between the high field and the low field magnet system, wherein the magnetic tunnel is provided with a further magnet system, and wherein the high field magnet system, the magnetic tunnel and the low field magnet system are arranged coaxially about the z-axis along a bore of the high field magnet system.

The invention relates to the technical field of oil and gas field development, in particular to a method for judging nuclear magnetic resonance pore throat radius distribution reasonability. The invention discloses a method for judging the rationality of nuclear magnetic resonance pore throat radius distribution, and the method comprises the steps: taking a high-pressure mercury injection pore throat radius cumulative volume ratio distribution curve as a left boundary line, and taking a converted nuclear magnetic resonance pore throat radius cumulative volume ratio distribution curve as a right boundary line; if the target nuclear magnetic resonance pore throat radius cumulative volume proportion distribution curve obtained by other methods is located between the left boundary line and the right boundary line, the target nuclear magnetic resonance pore throat radius cumulative volume proportion distribution curve is reasonable, otherwise, the target nuclear magnetic resonance pore throat radius cumulative volume proportion distribution curve is not reasonable; the method has an important value for oil and gas reservoir evaluation.

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.