A method for NMR measurements on borehole materials, e.g., sidewall cores, is based on performing a standard measurement in substantially homogeneous magnetic fields with a sensitivity volume covering an entire sample and a measurement on a fragment of the sample (local measurement), the fragment having a predetermined volume independent of the irregularities of the sample shape (e.g., irregular shaped edges). The fragment of the sample is selected using a switchable static magnetic field gradient or a localized radio-frequency magnetic field. The homogeneous and the local measurement data are processed jointly to obtain volume normalized NMR relaxation data (in porosity units), the processing also using a calibration sample data. A measurement apparatus with an automated sample transfer can be used to implement the method in order to perform high-throughput NMR relaxation measurements that do not require independent measurement of the sample volume.

An ambulance-compatible magnetic resonance imaging (MRI) system for on-site emergency diagnosis includes a mid-field super-conducting head-only magnet including a bore and an active shield arranged relative to the magnet, a passive shield arranged relative to the magnet, the passive shield including a first flange arranged adjacent to a first side of the magnet bore, a second flange arranged adjacent to a second side of the magnet bore, wherein the first flange and the second flange are electrically connected to each other, and wherein the passive shield is operative to capture flux extending out from the magnet bore and return the flux to the magnet. An asymmetric head gradient assembly for generating magnetic gradient field in the mid-field super-conducting magnet is also provided, the magnetic gradient field being between 100-150 mT/m or having a slew rate between 400-800 T/m/s. The MRI system includes a receiver coil and a controller operatively coupled to the receive coil, the controller configured to produce an image based on data obtained from the receive coil. The MRI system is mountable in an ambulance vehicle.

Techniques for suppressing noise in an environment of a magnetic resonance (MR) imaging system having at least one primary coil and at least one auxiliary sensor. The techniques involve estimating a transform, that, when applied to noise received by the at least one auxiliary sensor, provides an estimate of noise received by the at least one primary coil. The transform is estimated from data obtained by the at least one primary coil and the least one auxiliary sensor, with the data being weighted prior to estimation to remove or suppress data in regions with a high signal to noise ratio. In turn, the estimated transform may be applied to noise measured by the at least one auxiliary sensor during imaging of a patient, to estimate and suppress noise present in the MR signals received by the at least one primary coil during imaging.

The present disclosure provides a system and method for magnetic resonance imaging. The method may include obtaining first k-space data collected from a subject in a non-Cartesian sampling manner. The method may also include generating second k-space data by regridding the first k-space data. The method may further include generating third k-space data by calibrating the second k-space data, wherein a calibrated field of view (FOV) corresponding to the third k-space data is constituted by a central portion of an intermediate FOV corresponding to the second k-space data. The method may still further include reconstructing, using at least one of a compressed sensing algorithm or a parallel imaging algorithm, a magnetic resonance (MR) image of the subject based at least in part on the third k-space data.

Methods and systems are provided for determining scan settings for a localizer scan based on a magnetic resonance (MR) calibration image. In one example, a method for magnetic resonance imaging (MRI) includes acquiring an MR calibration image of an imaging subject, mapping, by a trained deep neural network, the MR calibration image to a corresponding anatomical region of interest (ROI) attribute map for an anatomical ROI of the imaging subject, adjusting one or more localizer scan parameters based on the anatomical ROI attribute map, and acquiring one or more localizer images of the anatomical ROI according to the one or more localizer scan parameters.

Methods and systems are provided for determining scan settings for a localizer scan based on a magnetic resonance (MR) calibration image. In one example, a method for magnetic resonance imaging (MRI) includes acquiring an MR calibration image of an imaging subject, mapping, by a trained deep neural network, the MR calibration image to a corresponding anatomical region of interest (ROI) attribute map for an anatomical ROI of the imaging subject, adjusting one or more localizer scan parameters based on the anatomical ROI attribute map, and acquiring one or more localizer images of the anatomical ROI according to the one or more localizer scan parameters.

Deoxyhemoglobin in a subject may be modulated to act as a contrast agent for use in magnetic resonance imaging. Sequential gas delivery may be applied to adjust the level of deoxyhemoglobin in the subject. A suitable magnetic resonance imaging (MRI) pulse sequence that is sensitive to magnetic field inhomogeneities, such as a blood-oxygen-level dependent (BOLD) sequence, may be used to detect deoxyhemoglobin as a contrast agent.

Deoxyhemoglobin in a subject may be modulated to act as a contrast agent for use in magnetic resonance imaging. Sequential gas delivery may be applied to adjust the level of deoxyhemoglobin in the subject. A suitable magnetic resonance imaging (MRI) pulse sequence that is sensitive to magnetic field inhomogeneities, such as a blood-oxygen-level dependent (BOLD) sequence, may be used to detect deoxyhemoglobin as a contrast agent.

The invention relates to a phantom for simple calibration and quality assurance in an MR tomograph, having a phantom body (2), measuring aids (10, 11, 12, 13) and an intermediate bottom (14) having an upper and a lower side, wherein the measuring aids (10, 11, 12, 13) and the intermediate bottom (14) are arranged in the phantom body (2) in at least four planes (6, 7, 8, 9) and a first plane (6) comprises as the measuring aid only the measuring fluid (10), a second plane (7) comprises as the measuring aid wedge-shaped elements (11), a third plane (8) comprises as the measuring aid marks (12) of known distance from one another, and a fourth plane (9) comprises as the measuring aid comb-shaped elements (13), wherein the measuring aids (11) of the second plane (7) are arranged on one side of the intermediate bottom (14), the measuring aids (13) of the fourth plane (9) are arranged on the other side of the intermediate bottom (14) and the measuring aids (12) of the third plane (8) are arranged in the intermediate bottom (14). By means of the arrangement of the measuring aids according to the invention, reliable calibration of the MR tomograph is possible in a few steps solely with the aid of the phantom according to the invention.

The invention relates to a phantom for simple calibration and quality assurance in an MR tomograph, having a phantom body (2), measuring aids (10, 11, 12, 13) and an intermediate bottom (14) having an upper and a lower side, wherein the measuring aids (10, 11, 12, 13) and the intermediate bottom (14) are arranged in the phantom body (2) in at least four planes (6, 7, 8, 9) and a first plane (6) comprises as the measuring aid only the measuring fluid (10), a second plane (7) comprises as the measuring aid wedge-shaped elements (11), a third plane (8) comprises as the measuring aid marks (12) of known distance from one another, and a fourth plane (9) comprises as the measuring aid comb-shaped elements (13), wherein the measuring aids (11) of the second plane (7) are arranged on one side of the intermediate bottom (14), the measuring aids (13) of the fourth plane (9) are arranged on the other side of the intermediate bottom (14) and the measuring aids (12) of the third plane (8) are arranged in the intermediate bottom (14). By means of the arrangement of the measuring aids according to the invention, reliable calibration of the MR tomograph is possible in a few steps solely with the aid of the phantom according to the invention.