Abstract: In a SEMAC-like magnetic resonance imaging, MR data of multiple readout partitions of a target slice are used in order to reduce image artifacts due to magnetic field inhomogeneities. Slice-selectively excited nuclear spins are refocused via radiation of multiple refocusing pulses. For each refocusing pulse, at least one kz-phase coding gradient is respectively applied along a first direction (to define a readout partition) and at least one ky-phase coding gradient is applied along a second direction to acquire MR data, wherein the first and second directions are orthogonal to one another. The multiple refocusing pulses have at least two different flip angles.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a plurality of receiving coils, a couch, a conversion unit, a selection unit, and a reconstruction unit. The receiving coils receive magnetic resonance signals emitted from a subject. The couch includes coil ports connected to the respective receiving coils. The conversion unit is provided on the respective coil ports and converts the magnetic resonance signals that are output from the respective receiving coils to digital signals so as to generate pieces of magnetic resonance data. The selection unit selects pieces of magnetic resonance data to be used for reconstruction among the pieces of magnetic resonance data for the channels that have been output from the receiving coils and converted to the digital signals. The reconstruction unit reconstructs image data using the pieces of magnetic resonance data selected by the selection unit.

Abstract: MRI apparatus includes an RF coil device, a first radio communication unit, a second radio communication unit, an image reconstruction unit and a judging unit. The RF coil device detects an MR signal, and includes a data saving unit for storing the MR signal. The first radio communication unit wirelessly transmits the MR signal detected by the RF coil device, and the second radio communication unit receives the MR signal from the first radio communication unit. The image reconstruction unit reconstructs image data using the MR signal. The judging unit judges existence of a transmission error in radio communication between the first and second radio communication units. If the transmission error is present, the first radio communication unit wirelessly transmit the MR signal stored in the data saving unit to the second radio communication unit.

Abstract: Systems and methods employing spin editing techniques to improve magnetic resonance spectroscopy (MRS) and magnetic resonance spectroscopic imaging (MRSI) are discussed. Using these spin editing techniques, magnetic resonance signals of one or more unwanted chemicals (that is, chemicals whose signals are to be filtered out or suppressed) chemicals can be suppressed, so that the signal(s) of a first set of chemicals can be obtained without signals from the one or more unwanted chemicals. Information about and differences between the molecular topologies of the first set of chemicals and the one or more unwanted chemicals can be used to design a sequence that suppresses the one or more unwanted chemicals while allowing acquisition of signal(s) from the first set of chemicals.

Abstract: A magnetic resonance imaging (MRI) system is provided. The system includes a main field magnet generating a main magnetic field B0. Moreover, the system further includes radio frequency (RF) receiver coils including a first combination of two coils, the two coils of the first combination decoupled based on quadrature decoupling such that the two coils of the first combination are able to receive signals orthogonal to each other and to B0. The two coils can be butterfly coils, the loop plane of the butterfly coils arranged along a surface, the longitudinal axis of the butterfly coils being substantially orthogonal and crossing at substantially midpoint. The surface can be substantially orthogonal to B0 and be curved. The first of the two coils can also be a loop coil and the second of the two coils a butterfly coil.

Abstract: In a method and apparatus for magnetic resonance imaging of an examination object, a control computer is provided with a designation of a first recording region, which is cuboidal. The computer automatically determines a second recording region that represents an adjustment of the first recording region such that the second recording region is cube-shaped. Magnetic resonance scan data are acquired from the entire second recording region. Magnetic resonance image data are reconstructed from the acquired magnetic resonance scan data. An image region of the magnetic resonance image data is supplied in electronic form from the computer.

Abstract: In the magnetic resonance image data acquisition and apparatus, raw magnetic resonance data are acquired at multiple points along a trajectory in k-space from first and second magnetic resonance echo signals caused by a radio-frequency excitation pulse. The course of the trajectory in k-space is established by adjusting a magnetic field value of a gradient magnetic field. The gradient magnetic field has a field value of a first point in time of the trajectory curve and a subsequently modified and at a layer second point in time, the gradient magnetic field has the same field value as that said first point in time. The second point in time is before or during the acquisition of the raw magnetic resonance data of the first magnetic resonance echo signal. The shift value for the trajectory is determined and the trajectory is shifted according to this shift value, and an image is reconstructed from the shifted raw magnetic resonance data of the trajectory.

Abstract: A cooling device is provided for an MRI system. A regulation unit for driving a refrigerant to subject the MRI system to a refrigeration cycle is based on a pre-collected cooling power demand of the MRI system in at least one state. By way of the cooling device and cooling method, the amount of energy needed to cool the MRI device is reduced.

Abstract: A local coil for a magnetic resonance imaging system for acquisition of magnetic resonance signals includes a receiving mechanism for wireless transmission of operating energy of the local coil and/or a signal of the magnetic resonance imaging system. The receiving mechanism is configured to take the operating energy and/or the signal from a supply field. A magnetic resonance imaging system is also provided. The magnetic resonance imaging system includes a transmitting mechanism for wireless transmission of operating energy of a local coil and/or a signal of the magnetic resonance imaging system. The transmitting mechanism has a transmission signal generator that is connected to a field source and a field sink. The transmitting mechanism is constructed such that, in operation, the operating energy and/or the signal is transmitted by a supply field that is present as an electrical alternating voltage field between the field source and the field sink.

Abstract: Magnetic resonance imaging (MRI) systems and methods to effect improved and more efficient determination of the specific absorption rate (SAR) are described. The SAR is calculated based upon a derived relationship between a body surface area (BSA) and a portion of the total radio frequency (RF) energy delivered to RF transmit coil that is deposited in the imaging subject, and the scanning is controlled in accordance with the calculated SAR.

Abstract: Provided are an apparatus and a method for canceling magnetic fields. The apparatus includes a magnetic field canceling coil disposed adjacent to an inner wall of a magnetic shield room to surround the entire inner space or a portion of an inner space of the magnetic shield room; and a magnetic field canceling coil driver to supply current to the magnetic field canceling coil. The magnetic field canceling coil cancels a prepolarization magnetic field established on the wall of the magnetic shield room by a prepolarization coil disposed in the center of the magnetic shield room to minimize magnetic interference caused by the magnetic shield room.

Abstract: Provided are a low-field nuclear magnetic resonance device and a low-field nuclear magnetic resonance method. The low-field nuclear magnetic resonance device includes a dynamic nuclear polarization (DNP) amplification unit to amplify the nuclear polarization of hydrogen atoms of water using a DNP-possible substance (DNP substance) to provide the amplified nuclear polarization to a measurement target, a sensor unit to measure a magnetic resonance signal of the measurement target using a SQUID sensor or an optically-pumped atomic magnetometer, and a measurement field coil to apply a measurement field to the measurement target. The DNP amplification unit is separated from the measurement target, the sensor unit, and the measurement field coil.

Abstract: A magnetic field generator includes a power source and a segmented or un-segmented coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time-varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 1000 microseconds. The coil may be comprised of overlapping, non-overlapping or partially overlapping coil segments that may individually energized to further improve the operating characteristics of the coil to further decrease bio-effects in magnetic resonance imaging through the use of reduced pulse lengths and multi-phasic magnetic gradient pulses.

Abstract: There is provided a novel method and circuit of compensating for cross-talk between pairs of adjacent array elements of a transceiver phased array and double-tuned transceiver arrays for a magnetic resonance system using a resonant inductive decoupling circuit. The geometry and size of the resonant inductive decoupling circuit allows for the decoupling circuit to compensate for the cross-talk between array elements, including the reactive and resistive components of the mutual impedance while being sufficiently small to not distort a RF magnetic field of the array elements produced within a sample.

Abstract: A method for generating a desired temporal profile of the magnetization state in an object under examination (O) during an experiment involving magnetic resonance is characterized in that at least one spatially dependent change in the magnetization state inside the object under examination (O) is predefined and spatially selective radio-frequency pulses, which allow a simultaneous and independent change in the magnetization state at locations with different stipulations, are irradiated in order to implement the predefined spatially dependent change in the magnetization state. The method permits establishment of the same desired temporal profile of the magnetization state for different regions of the object under examination despite different given experimental parameters or deliberate generation of different desired profiles of the magnetization state at different locations.

Abstract: A magnetic resonance imaging apparatus includes: a magnetostatic field magnet that is formed in the shape of a cylinder and generates a magnetostatic field in a space inside the cylinder; a gradient coil that is formed in the shape of a cylinder, is disposed in the cylinder of the magnetostatic field magnet, and applies a gradient magnetic field to the magnetostatic field; a bore tube that is formed in the shape of a cylinder and is disposed in the cylinder of the gradient coil; and an elastic member that is loop-shaped and hollow, is disposed in at least one selected from: a space between an inner circumferential side of the magnetostatic field magnet and an outer circumferential side of the gradient coil; and a space between an inner circumferential side of the gradient coil and an outer circumferential side of the bore tube, and thereby seals the space hermetically.

Abstract: A method for highly accelerated projection imaging (“HAPI”) is provided. In this method, conventional linear gradients are used to obtain coil sensitivity-weighted projections of the object being imaged. Only a relatively small number of projections, such as sixteen or less, of the object are required to reconstruct a two-dimensional image of the object, unlike conventional projection imaging techniques. The relationship between the voxel values of the imaged object and the coil sensitivity-weighted projections is formulated as a linear system of equations and the reconstructed images are obtained by solving this matrix equation. This method advantageously allows higher acceleration rates compared to echo planar imaging (“EPI”) with SENSE or GRAPPA acceleration. Moreover, the method does not require any additional or specialized hardware because hardware in conventional MRI scanners is adequate to implement the method.

Abstract: Various embodiments relate to a method for determining distortion-reduced magnetic resonance data in a subarea of a magnetic resonance system located along a radial direction of the magnetic resonance system at the edge of a field of view of the magnetic resonance system. The method includes positioning the object to be examined at a first and a second position along an axial direction of the magnetic resonance system and acquiring first magnetic resonance data in the subarea at the first position and acquiring second magnetic resonance data in the same subarea at the second position. The method also includes determining distortion-reduced magnetic resonance data based on the first and second magnetic resonance data.

Abstract: Systems and methods for magnetic resonance imaging (MRI) using side information for improved reconstruction are disclosed. In one aspect, in accordance with one example embodiment, images obtained using heteronuclei, such as Fluorine-19 (19F), can be reconstructed using one or more methods to provide improved resolution and detail. The system can use anatomical proton MRI scans. The system can use multiple smoothing techniques to improve the signal-to-noise ratio (SNR). The system can also use weighted smoothing using information from anatomical proton MRI scans to improve resolution.

Abstract: A power supply unit (130) powers at least one gradient coil (128) of a magnetic resonance (MR) examination system (110) with a main magnet (114) having, in at least one state of operation, a substantially static magnetic field strength, and with an MR measurement signal bandwidth. The power supply unit (130) includes a switched-mode power converter (134) for powering the at least one gradient coil (128), and including at least one switching member provided to switch between a conducting state configuration and an essentially non-conducting state configuration at a first fundamental switching frequency (fSW). A pulse control unit (132) is designed to provide switching pulses at the first fundamental switching frequency (fSW) for controlling the switching of the at least one switching member. Upon triggering by a trigger signal (142), the pulse control unit (132) is provided to change the first fundamental switching frequency (fSW) to at least a second fundamental switching frequency (fSW).