Abstract: A nuclear magnetic resonance coil array and a decoupling method thereof, and a nuclear magnetic resonance detection device. The coil array includes: a coil resonant unit and a decoupling network unit, where the coil resonant unit includes multiple coil resonant circuits; the decoupling network unit includes multiple decoupling circuits; where a coil resonant circuit includes a coil and a resonant capacitor; the resonant capacitor in each coil resonant circuit is connected in parallel with the coil; the coils in each coil resonance circuit are equally spaced on a circumference; a decoupling circuit is provided between a positive terminal and a negative terminal of adjacent coils, respectively; each coil is connected to an antenna switching circuit of a nuclear magnetic resonance detection device at the same time.

Abstract: A coil decoupling method for a magnetic resonance imaging device, including: sending an instruction causing a transmitter to send a transmitted signal, acquiring a received signal received by a receiver, wherein the received signal is a signal arriving at the receiver after the transmitted signal passes through two coils to be adjusted of a plurality of coils, determining the coupling value between the two coils to be adjusted based on the transmitted signal and the received signal, and sending an instruction for adjusting a decoupling component based on the coupling value.

Abstract: The present disclosure may provide a coil assembly. The coil assembly may include a supporting assembly and a radio frequency (RF) coil supported on the supporting assembly. The RF coil may have a plurality of coil units and a plurality of transmission ports. At least one of the plurality of transmission ports may be operably connected to a single coil unit of the plurality of coil units. Each of the plurality of transmission ports may be configured to transmit a drive signal to one of the plurality of coil units for generating a magnetic field.

Abstract: The present disclosure provides transmit/receive (T/R) systems for NMR or MRI systems. In one configuration, the systems and methods provided herein may use passively-shielded coils that are compatible with low-field operational environment to replace conventional T/R systems and spatial gradient systems. In some configurations, a low-field imaging T/R system is provided that is designed for nuclear magnetic stimulation and local flux sensitivity, while automatically rejecting incident radiant electromagnetic noise. The design advantageously leverages low required frequencies to distribute the pulse synthesis task, yielding a smaller system with easier maintenance and lower cost. The system may include distributed coil nodes that include a primary radiofrequency (RF) coil configured to transmit and receive RF signals and a secondary coil configured to passively shield the primary RF coil.

Abstract: 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).

Abstract: A high-frequency magnetic field generating device includes two coils arranged with a predetermined gap in parallel with each other, the two coils (a) in between which electron spin resonance material is arranged or (b) arranged at one side from electron spin resonance material; a high-frequency power supply that generates microwave current that flows in the two coils; and a transmission line part connected to the two coils, that sets a current distribution so as to locate the two coils at positions other than a node of a stationary wave.

Abstract: Permitted gradient intensities are established to prevent an overloading of a gradient unit of a magnetic resonance system during a recording, with the magnetic resonance system, of scan data from an examination object situated in a scan volume of said magnetic resonance system.

Abstract: The invention may improve image quality of magnetic resonance imaging (MRI). The invention is directed to a coil arrangement (200) for magnetic resonance imaging. It comprises a base structure having a variable shape, an RF coil arranged on or in the base structure, an actuator means at least partially extending along the base structure such that the base structure is deformable along and/or about at least one axis, a position detecting means adapted to detect a current position of at least a portion of the subject to be examined relative to the RF coil, and control means coupled to the position detecting means and the actuator means, wherein the control means is adapted to adjust the shape of the base structure to maintain a contact of an outer surface of the base structure (210) and/or the RF coil (220) with the at least portion of the subject by driving the actuator means in response to a detected change of the current position relative to a previous position.

Abstract: The present disclosure provides a noise reduction device. The noise reduction device may include a noise receiving component, a noise reduction component, a processing component, and a housing. The noise receiving component may be configured to receive acoustic noise information of a scanning environment where a medical device is located. The processing component may be configured to control the noise reduction component to generate sound information matching the acoustic noise information received by the noise receiving component. The housing may be configured to support the noise receiving component and the noise reduction component.

Abstract: An MRI system receive coil arrangement 3 for use with a main MRI scanner arrangement, the receive coil arrangement 3 including support structure and at least one receives coil 7 carried on the support structure 40. The support structure 40 includes a receive coil housing portion 43 which defines a channel portion 43a which houses at least a portion of the at least one receive coil 7. The channel having a mouth 43b for allowing the introduction of said at least a portion of the at least one receive coil 7 through the mouth 43b and into the channel 43a and a closing portion 45 moveable between a first position in which the mouth 43b of the channel portion is open for allowing introduction of the at least a portion of the at least one receive coil 7 into the channel portion 43a and a second, closing, position in which the mouth 43b of the channel is blocked by the closing portion 45.

Abstract: A head coil arrangement is for a magnetic resonance tomograph. In an embodiment, the head coil arrangement includes a send coil unit and a receive coil unit. The send coil unit, in the position in which the head coil arrangement is normally used on a patient, is automatically positionable in the longitudinal direction of the patient relative to the head coil arrangement. A further embodiment relates to a magnetic resonance facility comprising the head coil arrangement and a guide element, embodied to transmit a force to a dog. The send coil unit is positionable via the force on the dog.

Abstract: An apparatus (100) for damping vibrations in electrical lines (10) through which modulated currents flow has at least one sound or vibration sensor (102) oriented towards the line (10) or attached to the line, at least one actuator (104) connected to the line, and a control circuit (200) which is supplied, via respective signal lines (108), with signals generated by the at least one sound or vibration sensor (102) that represent sound or vibrations. The control circuit controls the at least one actuator (104) via respective control lines (110) such that this actuator counteracts the vibration of the line (10).

Abstract: A method and apparatus for accessing and imaging at least one body part of interest may position a subject in an imaging system to partially encloses the subject and partially expose the subject, and access at least one body part of the subject that is exposed outside the imaging system for a procedure. The at least one exposed body part is positioned to be imaged by the imaging system.

Abstract: The present disclosure provides a magnetic resonance imaging (MRI) radio frequency (RF) coil assembly. The MRI RF coil assembly may include one or more coils and one or more control circuits. Each of the one or more coils may include a first end and a second end. Each of the one or more control circuits may electrically connect the first end and the second end of one of the one or more coil. Each of the one or more control circuits may be configured to adjust an operation of the coil that is electrically connected with the control circuit based on an input control signal. The one or more control circuits may be located at different regions.

Abstract: A superconducting generator including an armature configured to be rotated via a shaft and a stationary field disposed concentric to and radially outward from the armature. The stationary field including a superconducting field winding and a vacuum vessel having an inner wall of one of a non-magnetic material or a paramagnetic material facing the armature, an opposed outer wall of a ferromagnetic material and a plurality of sidewalls coupling the inner wall and the opposed outer wall. The superconducting field winding is disposed in the vacuum vessel. A wind turbine and method are additionally disclosed. The wind turbine includes a rotor having a plurality of blades. The wind turbine further includes a shaft coupled to the rotor. Moreover, the wind turbine includes the superconducting generator coupled to the rotor via the shaft.

Abstract: A gradient coil unit may include a hollow cylinder surrounding a cylinder axis, delimited perpendicularly to the cylinder axis by a first longitudinal end and a second longitudinal end opposing the first longitudinal end. The hollow cylinder may include a first hollow cylinder region and a second hollow cylinder region separated from the first hollow cylinder region by a sectional plane perpendicular to the cylinder axis. The first hollow cylinder region may be delimited by the first longitudinal end and the second hollow cylinder region by the second longitudinal end. The gradient coil unit may also include a conductor structure configured to generate magnetic field gradients in three mutually different directions. The gradient coil unit may have a length corresponding to a distance between the first longitudinal end and the second longitudinal end of at least 140 cm.

Abstract: The present disclosure relates to systems and methods for reducing noise in an imaging system. The methods may include determining an imaging sequence for imaging a subject. When imaging the subject based at least on the imaging sequence, the imaging system may generate a first noise. The methods may further include obtaining, based on the imaging sequence, noise reduction data from a database. And the method may also include causing a generation device to produce a second noise based on the noise reduction data. The second noise may be configured to interfere with the first noise to reduce the first noise.

Abstract: An improved electromagnetic field generating antenna is compatible with fluoroscopic imaging and can be placed under, above or anywhere around the patient. The antenna includes one or more antenna elements laid out on a single or multi-layer PCB with current conducting metal traces used for creating electromagnetic fields for tracking sensors. An antenna enclosure is made with a polymer or other non-conductive material. The antenna does not have to be moved for allowing medical imaging during various procedures. An X-ray filter may be made out of similar sub-components as a full antenna assembly with the sole purpose of reducing the radiation dose to the patient during medical procedures without negatively affecting the image quality.

Abstract: Techniques for compensating for presence of eddy currents during the operation of a magnetic resonance imaging (MRI) system in accordance with a pulse sequence, the pulse sequence comprising a gradient waveform associated with a target gradient field. The techniques include: compensating for presence of eddy currents during operation of the MRI system at least in part by correcting the gradient waveform using a nonlinear function of a characteristic of the gradient waveform to obtain a corrected gradient waveform; and operating the MRI system in accordance with the corrected gradient waveform to generate the target gradient field.

Abstract: A radio frequency (RF) circuit is provided for use with a magnetic resonance imaging (MRI) scanner to transmit an RF receive signal to an amplifier circuit, the RF circuit comprising: a transmission line; an antenna electrically connected to a first end portion of the transmission line; an impedance transformation circuit; an impedance matching and detuning circuit electrically connected between the transmission line and the impedance transformation circuit, wherein the impedance matching and detuning circuit includes: multiple reactive impedance elements; and two or more switches operable to controllably switch between configuring the multiple reactive impedance elements to cause matching of overall impedance of the RF circuit to a prescribed input impedance seen at the amplifier circuit at a prescribed RF frequency during a receive mode of the MRI scanner, and to cause an increase of impedance at the antenna, to reduce sensitivity of the antenna to RF signals at the prescribed frequency during an excitation

Abstract: A method including the steps of receiving a first signal sensed from a patient, receiving a first physiological signal sensed from the patient, and processing the first signal based at least on the first physiological signal to obtain a second signal that is a measurement of the patient's Heart Rhythm.

Abstract: A coil assembly for use as a transmission and/or receiving coil in an MR system comprises a dipole antenna assembly with multiple dipole antennas. Connection elements are converted from an electrically conductive state to an electrically non-conductive state. In the electrically conductive state, the dipole antennas form a cylindrical volume coil and/or a conductor loop assembly, in particular a flat conductor loop assembly. The connection elements comprise blocking circuits which automatically block when a high-frequency alternating voltage with a frequency corresponding to the blocking frequency of the connection element blocking circuits is applied to the coil assembly.

Abstract: A magnetic resonance (MR) local coil, a magnetic resonance apparatus with an MR local coil, and a method for producing an MR local coil are provided. The MR local coil includes an outer casing, an antenna structure, and a frame for accommodating the antenna structure. The outer casing is embodied in a flexible manner and surrounds an inner area. The frame is embodied in a rigid manner, at least in regions, and is connected to the outer casing in a fixed manner. The antenna structure is arranged in the inner area of the outer casing and is held in position by the frame.

Abstract: A method of producing a permanent magnet shim configured to improve a profile of a B0 magnetic field produced by a B0 magnet is provided. The method comprises determining deviation of the B0 magnetic field from a desired B0 magnetic field, determining a magnetic pattern that, when applied to magnetic material, produces a corrective magnetic field that corrects for at least some of the determined deviation, and applying the magnetic pattern to the magnetic material to produce the permanent magnet shim. According to some aspects, a permanent magnet shim for improving a profile of a B0 magnetic field produced by a B0 magnet is provided. The permanent magnet shim comprises magnetic material having a predetermined magnetic pattern applied thereto that produces a corrective magnetic field to improve the profile of the B0 magnetic field.

Abstract: The invention relates to a method for carrying out signal detection by means of magnetic particle imaging, in which method magnetic/magnetisable particles (4), arranged in the field-free region of a location-dependent magnetic field, in particular a gradient magnetic field, are magnetised by means of an excitation magnetic field that changes over time, and the harmonics (9, 15), generated by the particles (4), of the frequency of the excitation magnetic field are detected as a signal from the magnetic particles (4) by means of a receiver coil arrangement (1) which in particular surrounds the particles (4), wherein a signal-transmitting arrangement, which has an outer coil (10) and at least one inner coil (11; 16, 17) connected in series to said outer coil, is positioned within the receiver coil arrangement (1) around the particles (4), wherein the signal received from the particles (4) by the at least one inner coil (11; 16, 17) is transmitted to the outer coil (10) by current flow and is re-emitted by said o

Abstract: The present disclosure may provide a magnetic resonance (MR) system. The MR system may include a magnet assembly, a gradient coil assembly, and a shim assembly. The magnet assembly may be configured to generate a main magnetic field. The magnet assembly may include a magnet and a cryostat configured to cool the magnet located inside the cryostat. The cryostat may form a bore. The gradient coil assembly may be configured to generate a gradient magnetic field. The gradient coil assembly may be located inside the bore. The shim assembly may be configured to at least partially shield a stray field which is generated by the gradient coil assembly and to which the magnet is subjected. The shim assembly may be located outside the gradient coil assembly.

Abstract: An apparatus for detachably fastening an NMR probe head with a pedestal box to an NMR magnet system of an NMR spectrometer has a holding system rigidly connected to the magnet system. A base plate of the holding system fastens detachably to the probe head pedestal box. A receiving device on or in the base plate receives all electric, electronic, optical, pneumatic, and thermal feed lines and optionally discharge lines required for the operation of the probe head. A lower side of the base plate in contact with an upper side of the pedestal box comprises multiple connecting elements into which the feed lines and discharge lines merge. The upper side of the pedestal box comprises receiving elements into which the feed lines and discharge lines from the connecting elements merge in a predetermined relative assembled position.

Abstract: A detection system including a plurality of terahertz light sources; and a plurality of terahertz-wave detecting devices which detect terahertz waves, wherein the plurality of terahertz light source includes a first terahertz light source which outputs the terahertz waves in a first on/off pattern with a first cycle, and a second terahertz light source which outputs the terahertz waves in a second on/off pattern with a second cycle which is different from the first cycle.

Abstract: A wireless power transmission apparatus comprises: a plurality of transmission coils configured to transmit a wireless power to a wireless power reception apparatus; a shielding coil which is arranged on at least one surface of a dielectric substrate, and is configured in a loop shape having at least two turns so as to surround the plurality of transmission coils; and a capacitor configured to connect one point to the other point of the shielding coil. The plurality of transmission coils are arranged inside the shielding coil disposed on the dielectric substrate, and the direction of a magnetic field formed at one side and the other side of the plurality of transmission coils adjacent to the shielding coil is formed to be opposite to the direction of a magnetic field formed around the shielding coil so that the shielding coil shields external exposure of electromagnetic waves by the plurality of transmission coils.

Abstract: The present disclosure provides techniques for using opto-isolator circuitry to control switching circuitry configured to be coupled to a radio-frequency (RF) coil of a magnetic resonance imaging (MRI) system. In some embodiments, opto-isolator circuitry described herein may be configured to galvanically isolate switch controllers of the MRI system from the switching circuitry and/or provide feedback across an isolation barrier. Some embodiments provide an apparatus including switching circuitry configured to be coupled to an RF coil of an MRI system and a drive circuit that includes opto-isolator circuitry configured to control the switching circuitry. Some embodiments provide an MRI system that includes an RF coil configured to, when operated, transmit and/or receive RF signals to and/or from a field of view of the MRI system, switching circuitry coupled to the RF coil, and a drive circuit that includes opto-isolator circuitry configured to control the switching circuitry.

Abstract: An electronic device to which a wireless charging system is applied is provided. The electronic device includes a battery, a charging circuit, and a circuit board configured to be electrically connected to the charging circuit and include a first portion and a second portion disposed adjacent to the first portion, wherein a first coil, a second coil, and a resonance coil are disposed in the first portion of the circuit board, the first coil being disposed outside the second coil, and the resonance coil being disposed inside the second coil, and wherein a third coil and a resonance capacitor are disposed in the second portion of the circuit board, the resonance capacitor being disposed inside the third coil, and the resonance coil and the resonance capacitor being electrically connected to each other to generate a designated resonance.

Abstract: A part of a second split-flow pipe is branched into at least a first branch pipe and a second branch pipe. A second spring check valve is disposed in the first branch pipe to open when a pressure difference between an upstream side and a downstream side of the second spring check valve in the first branch pipe becomes more than or equal to a second set pressure higher than a first set pressure. A third spring check valve is disposed in the second branch pipe to open when a pressure difference between an upstream side and a downstream side of the third spring check valve in the second branch pipe becomes more than or equal to a third set pressure higher than the first set pressure. The second branch pipe is different from the first branch pipe in terms of at least one of diameter, length, and inner volume.

Abstract: A magnetic field probe (1) having a capsule (3), in which an MR-active substance (5) is encapsulated. Two coils (7, 9) are preferably arranged in the capsule (3). Advantageous production methods for magnetic field probes (1) are also described, as well as advantageous uses of the magnetic field probe (1) and methods in which magnetic field probes (1) of this kind and arrangements of magnetic field probes (1) are used.

Abstract: A system for MR Elastography of a sample, including ultrasound gel to sheath the sample, a vessel to accept the flow of the sample sheathed in ultrasound gel, a sensor array adapted to capture an ultrasound measurement and an MR measurement, wherein the sensor array including an ultrasound transmitter and an ultrasound receiver, and the sensor array is coupled to the vessel, and the vessel is capable of mechanical conductance between the ultrasound transducers, and the ultrasound gel, and a pump to create a pressure based flow of ultrasound fluid through the vessel and move the sample in proximity to the sensor array for capture of MR and ultrasound measurements of the sample as the sheathed sample passes by the sensor array.

Abstract: A wireless coil adaptor includes a first plug connector configured to be inserted within a receptacle connector of an MRI system, the receptacle connector being configured for receiving a second plug connector of a wired radio frequency (RF) coil. The wireless coil adaptor also includes a wireless communication module configured to wirelessly communicate with a wireless RF coil.

Abstract: A magnetic resonance imaging (MRI) coil device is provided. The device includes a first receiver coil portion, a second receiver coil portion, and a locking mechanism. The second receiver coil portion is configured to fit with the first receiver coil portion to provide a receiver coil assembly. The second receiver coil portion is moveable relative to the first receiver coil portion. The locking mechanism is configured to limit relative movement between the first receiver coil portion and the second receiver coil portion when the first receiver coil portion and the second receiver coil portion are fit together.

Abstract: The invention relates to a magnetic resonance coil array (30) of a magnetic resonance system having a distributed cable routing realized by a self-compensated radiofrequency choke (10). The magnetic resonance coil array (30) comprises multiple magnetic resonance receive coils (32), an input-output unit (34), and multiple coaxial cables (14) interconnecting the magnetic resonance receive coils (32) with the input-output unit (34). The coaxial cable (14) comprises the self-compensated radiofrequency choke (10). The self-compensated radiofrequency choke (10) allows to replace conventional bulky resonant radiofrequency traps used in conventional magnetic resonance coil arrays and allows implementing the distributed cable routing. The self-compensated radiofrequency choke (10) comprises a choke housing (12) having a toroidal form and the coaxial cable (14), wherein the coaxial cable (14) is wound around the choke housing (12) in a self-compensated winding pattern.

Abstract: The invention relates to quality control devices and methods for magnetic resonance imaging (MRI) systems, more particularly for medical imaging applications. An example is stereotactic surgery where MRI images are combined with X-ray images to accurately locate a target in a subject. A test device (1), and an associated method using said test object, are used to easily detect a faulty calibration or a malfunction of an MRI device. The test device includes: a hermetically sealable hollow body (20) having a substantially cylindrical shape, a support frame (22) configured to be removably inserted in the hollow body and defining a target region (V22) having a substantially cylindrical shape; and a plurality of target objects (24) made of a material visible on X-ray images and MRI images said target objects being arranged in the target region and being attached to the support frame.

Abstract: A passive MRI enhancing embodiment includes a plurality of resonators and increases signal-to-noise ratio of radiofrequency signals emitted by a specimen and captured by an MRI machine. The apparatus increases the magnetic field component of radiofrequency energy during signal transmission from the MRI machine to the specimen, and/or reception of signals from the specimen to the MRI machine. Use of the apparatus improves the images generated by the MRI machine, and/or reduces the time necessary for the MRI machine to capture the image. An isolator embodiment has a nonlinear resonator controllably configurable alternately into an isolation configuration and a transmission configuration, and a second resonator.

Abstract: Embodiments described herein generally relate to systems, tools, and methods for flow assurance monitoring within pipe structures. In an embodiment is provided a method of determining at least one property of a mixture flowing through a system that includes introducing an inhibitor to a fluid flowing through the system to form the mixture; exposing the mixture to electromagnetic energy to induce at least one paramagnetic response from at least one diamagnetic species present in the mixture flowing through the system; performing electron paramagnetic resonance (EPR) spectroscopy on the at least one paramagnetic response to generate an EPR spectrum; and determining the at least one property of the mixture based on the EPR spectrum. Apparatus for determining fluid properties and systems for extracting hydrocarbons from a subterranean reservoir are also provided.

Abstract: An electron paramagnetic resonance (EPR) spectrometer includes a magnet system comprising at least one magnet and at least one pole piece for producing a magnetic field along a pole axis in a field of view in front of the at least one pole piece. A probe head comprising a microwave resonator and at least one modulation coil or rapid scan coil produces an additional, time-varying magnetic field aligned along the pole axis. The probe head is arranged in the field of view, and a respective modulation coil or rapid scan coil is arranged between the microwave resonator and a respective pole piece. For each pole piece, at least a part of said pole piece is made of a function material having an electric conductivity ?f of 104 S/m or less, and having a saturation magnetic flux density BSf of 0.2 T or more.

Abstract: The invention provides for a medical instrument (100, 400, 500, 600, 900, 1000, 1100. 1200, 1400) comprising a magnetic resonance imaging system. The medical instrument comprises: a radio frequency system (116) configured for sending and receiving radio frequency signals to acquire magnetic resonance imaging data (302). The radio frequency system is configured for connecting to a magnetic resonance imaging antenna (114). The medical instrument further comprises a subject support (120) configured for supporting at least a portion of a subject (118) in an imaging zone (108) of the magnetic resonance imaging system. The subject support comprises an antenna connector (124) configured for connecting to the magnetic resonance imaging antenna. The radiofrequency system is configured for connecting to the magnetic resonance imaging antenna via the antenna connector.

Abstract: A method for autonomously cooling down a cryogen-free superconductive magnetic coil system includes: (a1) measuring the current temperature Tactual at the magnet and comparing it to a temperature target value T1target; (a2) if Tactual>T1target, actuating a vacuum pump and opening a barrier valve in a vacuum conduit that leads from the vacuum pump into a vacuum vessel containing the magnet; (b1) measuring the current pressure Pactual in the vacuum vessel and comparing it to a pressure target value P1target; (b2) if Pactual<P1target, activating a cold head for cooling a cooling arm; (c1) measuring Tactual and comparing it to the first temperature target value T1target; (c2) if Tactual<T1target, closing the barrier valve and switching off the vacuum pump; (d1) measuring Tactual and comparing it to a second temperature target value T2target and maintaining the second temperature target value T2target.

Abstract: A cable mantle for shield current suppression in a shielded cable includes a through hole for hosting the shielded cable; and a plurality of resonant elements; wherein each of the resonant elements includes an inner tube-shaped conductive structure; an outer tube-shaped conductive structure; a first transversal conductive structure; a second transversal conductive structure; and at least one capacitor bridging a gap between a first longitudinal portion of the outer tube-shaped conductive structure and a second longitudinal portion of the outer tube-shaped conductive structure, so that an electrical behavior of the inner tube-shaped conductive structure, the first longitudinal portion of the outer tube-shaped conductive structure, the second longitudinal portion of the outer tube-shaped conductive structure, the first transversal conductive structure, the second transversal conductive structure and the at least one capacitor is equivalent to a parallel resonant circuit defining a resonance frequency of the res

Abstract: It is an object to provide a technique allowing for suppression of the height of a protrusion from the surface of a semiconductor module. A semiconductor device includes: a semiconductor module having a first groove; a Belleville washer having a recess in an outer surface and a protrusion on an inner surface; and a screw passing through the hole of the Belleville washer and the first groove of the semiconductor module to fasten the semiconductor module and an attached body. A head of the screw is accommodated in the recess of the Belleville washer, and at least portion of the protrusion of the Belleville washer is accommodated in the first groove of the semiconductor module.

Abstract: A magnetic resonance (MR) imaging method of correcting nonuniformity in diffusion-weighted (DW) MR images of a subject is provided. The method includes applying a DW pulse sequence along a plurality of diffusion directions with one or more numbers of excitations (NEX), and acquiring a plurality of DW MR images of the subject along the plurality of diffusion directions with the one or more NEX. The method also includes deriving a reference image and a base image based on the plurality of DW MR images, generating a nonuniformity factor image based on the reference image and the base image, and combining the plurality of DW MR images into a combined image. The method also includes correcting nonuniformity of the combined image using the nonuniformity factor image, and outputting the corrected image.

Abstract: In a superconducting coil used in an MRI apparatus, it is necessary to arrange a superconducting wire at a desired position to obtain a desired coil shape in order to obtain a temporally stable static electromagnetic field with high strength and high uniformity. A superconducting coil includes a winding frame, a spacer disposed on an outer periphery of winding frame and including a winding groove having a spiral shape and a communication groove provided between winding grooves, and includes a coil group having a superconducting wire wound in winding groove. It is therefore possible to obtain superconducting coil having a desired coil shape.

Abstract: RF coil assemblies are disclosed that include multiturn loops formed of conductors configured to receive RF signals from a patient during MRI. The multiturn loops include an inner loop and an outer loop that both lie substantially in a plane of the RF coil assembly. The inner loop is at least partially nested within the outer loop.

Abstract: An NMR probehead having a transceiver coil arrangement comprises at least one transceiver coil for generating an HF B1 magnetic field, the transceiver coil having a connection region and at least one electrical conductor portion with a forward winding portion that leads in a prespecified winding direction from the connection region to an axial end. A backward winding portion leads in the same winding direction, from the axial end to the connection region, with windings having a pitch P with the opposite sign to windings of the forward winding portion. The forward and backward windings, with the exception of crossover regions in which the forward and backward windings cross over each other, are arranged on the same cylindrical surface about a longitudinal axis Z?. With the invention, electric fields visible for the sample are reduced, together with other types of performance losses.

Abstract: Aspects of the subject technology relate to securing magnets within a nuclear magnetic resonance (“NMR”) tool in a manner that prevents damage or disturbance of the magnets due to the drilling environment, and more particularly, to creating a chamber within the structure of a logging while drilling (“LWD”) tool to isolate the magnets from certain external conditions. A downhole tool comprises a tool collar with a recessed portion comprising a collar mandrel section and a threaded segment, wherein the recessed portion of the tool collar comprises at least one cavity configured to accept one or more carriers configured to hold one or more magnets, a compression sleeve covering the recessed portion and the at least one cavity of the downhole tool; and a compression sub component mated to the threaded segment and configured to compress the compression sleeve toward the shoulder of the unrecessed portion of the tool collar.