Systems and methods for estimating magnetic susceptibility of a patient through continuous motion in an MRI scanner are provided herein. In one or more examples, during the collection of data, the patient can be instructed to move their head or other part of the body in a continuous manner and for a fixed duration of time. During the fixed duration of time, magnitude a data from the RF signal can be received by one or more RF coils can be collected. The received and undersampled magnitude data can be converted to phase data which can then be converted to magnetic susceptibility. Thus magnetic susceptibility can be determined while allowing for continuous motion during the MRI scan, which can be more comfortable and feasible for the patient in contrast to techniques that require the patient to hold their body at a particular orientation in the scanner for a fixed duration of time.

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.

This disclosure generally relates to stable water isotope labeling followed by detection via MRI (swiMRI), including deuterium MRI (dMRI) and .sup.17O MRI, for visualizing rapidly dividing immune cells within target and/or lymphoid organ/s and/or tissues affected by chronic graft-versus-host disease (cGVHD). Using deuterated water labeling, followed by dMRI, a distinction in deuterium signal was detected in a target organ (e.g. liver) of the cGVHD-affected mice compared to unaffected mice, i.e. syngeneic HSCT recipient mice, where the host and donor are matched, and normal (unmanipulated) mice.

Apparatus and method that includes providing a variable-parameter electrical component in a high-field environment and based on an electrical signal, automatically moving a movable portion of the electrical component in relation to another portion of the electrical component to vary at least one of its parameters. In some embodiments, the moving uses a mechanical movement device (e.g., a linear positioner, rotary motor, or pump). In some embodiments of the method, the electrical component has a variable inductance, capacitance, and/or resistance. Some embodiments include using a computer that controls the moving of the movable portion of the electrical component in order to vary an electrical parameter of the electrical component. Some embodiments include using a feedback signal to provide feedback control in order to adjust and/or maintain the electrical parameter. Some embodiments include a non-magnetic positioner connected to an electrical component configured to have its RLC parameters varied by the positioner.

The embodiments relate to a directional coupler including, in each case, one connection for a first, a second, a third, and a fourth port. The coupler includes a first coupling network for providing the connection for the first port and a second coupling network for providing the connection for the second port. The first and second coupling networks are both connected to the connections for the third and fourth ports, wherein the second coupling network has a first inductance connected between the third port and an electrical reference potential, a first capacitance connected between the fourth port and the electrical reference potential, a second capacitance connected between the third port and the second port, and a second inductance connected between the fourth port and the second port.

The embodiments relate to a magnetic resonance imaging device, where the cladding of the patient bore of the MR imaging device includes a conductive layer.

In a magnetic resonance method and apparatus for determination of a measurement variable that is relevant to a function of an organ of a patient, a first longitudinal relaxation rate R.sub.1.sup.1 is determined before a contrast medium is administered to the patient. A second longitudinal relaxation rate R.sub.1.sup.2 is determined after a contrast medium is administered to the patient. A property of the contrast medium in the organ is determined based on R.sub.1.sup.1 and R.sub.1.sup.2. The measurement variable is determined based on the property of the contrast medium in the organ.

A local radio frequency (RF) coil assembly (A) defining a pediatric patient receiving region (12) to be mounted to a patient support table (B) of an MRI scanner (E). The local RF coil assembly (A) includes a rigid coil body (16,18) operatively connected to an adjustable coil part (20) along a hinge axis (26). A carrier (F) is configured to receive a pediatric patient (C) and be positioned into engagement with the local RF coil assembly (A). An interlock assembly (51) holds the adjustable coil part (20) in a selected position (50) when the carrier (F) interacts with the adjustable coil part (20). At least one bearing (34, 36) is configured to pivot and bias the adjustable coil part (20) relative to the carrier (F) and gravity bias the interlock assembly and the carrier (F) into an interlocking engagement. The adjustable coil part (20) is gravity biased to the open position (28) when the carrier (F) is removed.

A whole-body coil for a magnetic resonance tomography device includes one or more compensation capacitors between a high-frequency antenna and an RF shield. The one or more compensation capacitors each have variable capacitance caused by a variation in a distance of the RF shield to the high-frequency antenna.

An NMR well logging tool is provided that includes a sensor and associated electronic circuitry. The sensor includes an array of RF antenna elements. The electronic circuitry includes at least one low-power integrated circuit and a plurality of high-power modules corresponding the RF antenna elements of the array. Each high-power module is coupled to a corresponding RF antenna element of the array and includes an RF amplifier that is configured to amplify RF pulses generated by the at least one low-power integrated circuit and supplied thereto for transmission by the corresponding antenna element. In embodiments, the RF amplifier of each high-power module can include an H-bridge circuit or other suitable RF amplifier.