Abstract: In some aspects, a method of operating a magnetic resonance imaging system comprising a B0 magnet and at least one thermal management component configured to transfer heat away from the B0 magnet during operation is provided. The method comprises providing operating power to the B0 magnet, monitoring a temperature of the B0 magnet to determine a current temperature of the B0 magnet, and operating the at least one thermal management component at less than operational capacity in response to an occurrence of at least one event.

Abstract: According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate.

Abstract: A method for creating a magnetic resonance (MR) image with prospective motion correction with a recording of navigation signals and navigator reference signals for the determination of motion information is provided. During the determination of the motion information, the partial volumes of the navigator volume are not all treated equally. Different weightings are used.

Abstract: A method for slab selection in ultrashort echo time three-dimensional MRI includes applying an excitation signal to a target under a polarizing field; applying a unipolar slab selection gradient pulse to the target, concurrent with the excitation signal; and applying a rewinder pulse to the target for less than about 30 ?s, immediately after the slab selection gradient pulse, and still under the polarizing field.

Abstract: A method for magnetic resonance fingerprinting and to a magnetic resonance device is provided. The method for magnetic resonance fingerprinting includes the following method steps—detecting a magnetic resonance signal waveform of an examination area of an examination object by means of a magnetic resonance fingerprinting method, comparing the detected magnetic resonance signal waveform with a number of signal waveforms stored in a database, wherein a database value of at least one tissue parameter is assigned to each of the database signal waveforms, and determining a value of the at least one tissue parameter on the basis of the signal comparison, wherein an influence of a temperature of the examination object on the magnetic resonance signal waveform is taken into consideration in the further processing of the magnetic resonance signal waveform.

Abstract: A gradient coil unit includes a tubular gradient coil and support structures. The tubular gradient coil is configured to apply a gradient magnetic field to an imaging region of magnetic resonance imaging. The support structures are fixed to plural positions of the gradient coil. The support structures are configured to hold the gradient coil on a tubular magnet by applying pressing forces on positions of an edge inside a wall forming the magnet. The pressing forces each has a component in a central axis direction of the magnet. Further, according to another embodiment, a magnetic resonance imaging apparatus includes the above mentioned gradient coil unit, a static field magnet and at least one radio frequency coil configured to perform magnetic resonance imaging of an object.

Abstract: A method for operating a magnetic resonance apparatus by a safety unit, taking into account persons fitted with an implant, a safety unit, a safety system, a magnetic resonance apparatus, and a computer program product are provided. The magnetic resonance apparatus includes a first part and a second part. The first part is operated separately from the second part and includes the safety unit. During an examination of a person fitted with an implant, the safety unit checks that the magnetic resonance apparatus, in a restricted operating mode, is complying with implant-conformant limit values.

Abstract: A system and method is described to measure the magnetic field gradient using an optically pumped magnetometer configured as an intrinsic gradiometer. Atoms are prepared in a freely precessing coherent superposition of the magnetically sensitive hyperfine ground states in two or more physically separated locations. A probe laser beam is used to interrogate atoms in both locations. As the probe light beam passes through the coherent atoms, optical sidebands are self-generated at the ground state hyperfine frequency of the magnetically sensitive states. Each of the two sets of atoms produces distinct sidebands at a frequency separation proportional to the magnetic field experienced by each set of atoms. The probe light is captured using a photodetector. The self-generated probe optical sidebands interfere to produce a beat note whose frequency is proportional to the magnetic field gradient between the two sets of atoms.

Abstract: In a magnetic resonance facility and operating method for acquiring image data of a patient in a manner defined by acquisition parameters, the acquisition of the image data is preceded by the performance of at least one alignment operation for adjusting operating parameters of the magnetic resonance facility that influence acquisition conditions for the current patient. At least one result data item describing the result of the alignment used for an at least partially automatic determination of at least one acquisition parameter not relating to the pulse shape of a radio-frequency pulse to be used during the acquisition.

Abstract: Various embodiments are described herein for an apparatus and a method for measuring and characterizing geometric distortions for a region of interest in images obtained using magnetic resonance. The method comprises deriving a computed set of 3D distortion vectors for a set of points within a region of interest covered by a phantom by using harmonic analysis to solve an associated boundary value problem based on boundary conditions derived from a measured set of 3D distortion vectors. The characterized image distortions may be used for various purposes such as for image correction or for shimming, for example.

Abstract: A jacket for radio frequency (RF) shielding a Magnetic Resonance Device (MRD) from external environment electromagnetic interference during its operation, which allows for homogenized imaging conditions. The RF shielding jacket is sized and shaped like an envelope to accommodate the MRD, with at least a portion of the RF shielding jacket including an electromagnetic interference shield. The RF shielding jacket is also combined with passive temperature insulating properties.

Abstract: Gradient coils are operated to acquire magnetic resonance (MR) signals encoding a first MRI image over a first region inside a main magnet of the MRI system in which at least a portion of a subject is placed, the first region being located within a volume of uniform magnetic field with inhomogeneity below a defined threshold. An active coil is energized to shift the volume of uniform magnetic field such that a second region inside the main magnet of the MRI system is located within the shifted volume of uniform magnetic field, at least a portion of the second region being located outside of the volume of uniform magnetic field before the volume of uniform magnetic field has been shifted. The gradient coil is operated to acquire MR signals encoding a second MRI image over the second region.

Abstract: A system and method acquiring images of a region of interest (ROI) of a subject using a magnetic resonance imaging system. The system or method are capable of acquiring pathological data from tissue in the ROI believed to be pathological tissue and acquiring baseline data from tissue in the subject believed to not be pathological tissue. The system or method are also capable of determining correlation parameters from baseline data, generating corrected data using the baseline correlation parameters to correct the pathological data at least for intrinsic heterogeneity, and generating a report using the corrected data.

Abstract: A device for attaching and detaching a cryogenic probe to and from a nuclear magnetic resonance (NMR) spectrometer. The device permits the probe to be loaded in the spectrometer in a shortened time and achieves high measurement throughput. The device has loading platforms (11-1, 11-2) on which cryogenic probes (P1, P2) are loaded. Each loading platform has a horizontal drive mechanism, a vertical drive mechanism, and a spacing mechanism. The device further includes probe cooling devices (14-1, 14-2) for circulating a refrigerant to and from the cryogenic probes (P1, P2) via transfer tubes (12-1, 12-2) made of a flexible material, thus cooling the probes (P1, P2). A temperature-controlled gas feeder (18) supplies a temperature variable gas for temperature adjustment to the probes (P1, P2). A vacuum pumping system (15) evacuates the interiors of the probes (P1, P2) via vacuum pipes (17-1, 17-2) made of a flexible material.

Abstract: A magnetic resonance imaging apparatus and method simultaneously measure physical properties including relaxation rates, proton densities, and apparent diffusion coefficients of a subject. The apparatus and method use a single magnetic resonance acquisition of the subject in order to measure the physical properties.

Abstract: Magnetic resonance (MR) calibration data are acquired using a plurality of radio frequency receive coils, and both coil sensitivity maps and reference projection vectors are generated based on the MR calibration data. During imaging, extra navigator projection vectors are acquired, or part of the imaging data can be used as navigator projection vectors. Partially parallel imaging (PPI) can performed to enhance the navigation information. The navigator projection vectors and the reference projection vectors are sensitivity weighted using the coil sensitivity maps to generate navigator sensitivity weighted projection vectors (navigator SWPV) and reference sensitivity weighted projection vectors (reference SWPV) respectively, and these are compared to generate subject position information. The subject motions are compensated prospectively or retrospectively using the generated subject position information.

Abstract: Magnetic resonance imaging (MRI) acquisition and reconstruction techniques that invert MR signals of selected frequencies without the application of inversion RF pulses are disclosed. An example method comprises acquisition of at least one MR image representative dataset and an associated phase reference dataset, and classifies anatomical material into a first component representing anatomical material having a first range of resonance frequencies associated with a first range of phase differences between the MR image representative dataset and the reference image dataset and a second component representing anatomical material having a second range of resonance frequencies associated with a second range of phase differences between the MR image representative dataset and the reference image dataset. The method assigns different visual attributes to first and second components derived using phase differences between the MR image representative dataset and the reference image dataset and displays an image.

Abstract: A gradient magnetic field coil device has a main coil arrangement formed by embedding into first resin multiple main coils for generating a gradient magnetic field and a leakage magnetic field, and a shield coil arrangement formed by embedding into second resin multiple shield coils for suppressing the leakage magnetic field, wherein the shield coil arrangement includes a facing area that faces the main coil arrangement and is fixed to the main coil arrangement, and a protruding area that protrudes beyond the main coil arrangement, wherein insulated reinforcing members are embedded into the second resin in the protruding area. Multiple reinforcing members are arranged in a circumferential direction of the shield coil arrangement, and the second resin is preferably filled between the adjacent-to-each-other reinforcing members. The reinforcing members are preferably arranged toward the main coil arrangement with respect to the shield coils.

Abstract: A method for acquiring 3D multispectral MRI of a target includes scanning a spectrum of spectral windows with an MRI scanner, wherein each spectral window of the spectrum defines a continuously-differentiable distribution of frequencies around a scan frequency and adjacent scan frequencies are spaced apart by substantially uniform frequency offsets such that adjacent spectral windows substantially uniformly overlap, wherein selected adjacent spectral windows are scanned in consecutive passes, and nearest neighbor spectral windows within each pass are scanned at a maximum temporal spacing within the pass.

Abstract: One embodiment of the invention includes a magnetometer system. The system includes a sensor cell comprising alkali metal particles and a probe laser configured to provide a probe beam through the sensor cell. The system also includes a detection system configured to implement nuclear magnetic resonance (NMR) detection of a vector magnitude of an external magnetic field in a first of three orthogonal axes based on characteristics of the probe beam passing through the sensor cell and to implement electron paramagnetic resonance (EPR) detection of a vector magnitude of the external magnetic field in a second and a third of the three orthogonal axes based on the characteristics of the probe beam passing through the sensor cell. The system further includes a controller configured to calculate a scalar magnitude of the external magnetic field based on the magnitude of the external magnetic field in each of the three orthogonal axes.