Abstract: Method for separating measurement data of an examination object, which data was acquired in collapsed form simultaneously for slices using an EPI SMS technique, into measurement data of individual slices, first and second sets of reference measurement data for separating the measurement data are acquired for each of the slices using a GRE acquisition technique, wherein the reference measurement data in the first set is acquired during switching of readout gradients of a first polarity, and the reference measurement data in the second set is acquired during switching of readout gradients of a second polarity. Based on the two sets of reference measurement data, corresponding separate first calibration data is determined from the reference measurement data acquired using a GRE acquisition technique while switching readout gradients of a first polarity, and second calibration data is determined from the reference measurement data acquired while switching readout gradients of a second polarity.

Abstract: A method for magnetic resonance imaging (MRI) includes determining a Partial Fourier (PF) factor and an acceleration factor for acquiring k-space data from a subject. The method also includes acquiring a set of k-space data from the subject using the PF factor along with an under-sampling technique, wherein the under-sampling technique is dependent on the acceleration factor. The image of the subject is reconstructed by processing the set of k-space data using a deep learning (DL) network.

Abstract: Embodiments of the present disclosure provide methods and systems for gradient sensitivity correction. The method may include obtaining a three-dimensional image of a phantom. The three-dimensional image may be acquired using an MRI device, and the phantom may have a known actual size on a target axis. The method may include determining a fitting size of the phantom on the target axis by fitting the three-dimensional image. The method may further include correcting, based on the fitting size and the actual size, a gradient sensitivity of the MRI device.

Abstract: The magnetic resonance imaging apparatus includes: a high-frequency coil; a gradient magnetic field generation coil; a static magnetic field generation coil which is a superconducting coil having an inductance larger than an inductance of the high-frequency coil and an inductance of the gradient magnetic field generation coil; an energization controller that energizes the static magnetic field generation coil; a voltage measurement unit that measures a voltage between current lead terminals of the static magnetic field generation coil; and a magnetic material detection unit that detects a magnetic material existing in an imaging space of the magnetic resonance imaging apparatus and a magnetic material existing in a vicinity of the imaging space based on a first voltage that is a voltage measured in a state where the static magnetic field generation coil is energized with a first current less than a rated current in capturing the magnetic resonance image.

Abstract: A magnetic resonance examination system comprising a main magnet for applying a uniform static magnetic field. An active shim system applies shim magnetic fields to correct for inhomogeneities of the static magnetic field. A shim driver system activates the active shim system on the basis of B0-shim settings. A trained machine-learning module is trained to return the B0-shim settings from one or more actual load parameters. The magnetic resonance examination system may further comprise an RF transmit system with RF antenna elements and an RF driver system to activate the RF antenna elements for applying a (B1) radio frequency field having a predetermined spatial distribution. An RF shim system to control the RF driver system to apply shim radio frequency fields to correct for deviation of the radio frequency field's spatial distribution from the predetermined spatial distribution on the basis of RF-shim settings.

Abstract: The disclosure relates to a cooling apparatus with a control unit for a detector unit included in a magnetic resonance device. The control unit comprises at least two electronic components that generate waste heat during operation of the magnetic resonance device. The control unit is to be arranged on a surface of the detector unit, and comprises an active cooling unit comprising at least one piezoelectric fan, which is embodied to generate an airflow on a surface of the control unit and/or on a surface of at least one electronic component of the at least two electronic components.

Abstract: Non-magnetic thermally-controlled bimetal valves comprising active and passive members having different coefficients of thermal expansion, and systems incorporating such valves, are described herein. These valves and systems find particular application in the field of patient care as it relates to magnetic resonance (“MR”) environments, such as environments with strong electromagnetic fields generated by MR imaging machines.

Abstract: A method for evaluating a multiphase drilling fluid includes receiving a sample of the multiphase drilling fluid and modifying the sample to enhance a separation of a first NMR peak corresponding to a first fluid phase component and a second NMR peak corresponding to a second fluid phase component. A nuclear magnetic resonance (NMR) measurement is made of the modified sample and evaluated to compute a property of the drilling fluid.

Abstract: A system and method for measuring a source rock sample's maturity by a static high field resolution nuclear magnetic resonance (NMR) spectroscopy is disclosed. Kerogen, a part of the source rock matrix is studied, to quantify the amount of hydrogen (H) and carbon (C) present. This technique is non-destructive and non-invasive to the sample. The method further includes determining the H/C ratio of the kerogen in the source rock sample by integrating the H/C ratio of a known external reference sample.

Abstract: An imaging apparatus comprising: at least a first module comprising a trolley provided with a plate on one face of which rests a magnetic assembly intended to apply a main magnetic field in an analysis zone of a main housing of the magnetic assembly, the trolley additionally comprising two side walls supporting the plate via one of their edges, designated the upper edge; a second module of substantially parallelepipedal shape, supporting a set of electronic control elements, the console being, in particular, configured to be inserted between the side walls of the trolley; the console and the first module comprising means of identification, by the console, of the geometric and magnetic features of the magnetic assembly of the first module, the means of identification being integrated in connection means.

Abstract: A camera image of a subject to be examined after mounting a reception coil, which is acquired before the subject to be examined is transported to an imaging position, information for specifying a position (target position) of an imaging site of the subject to be examined, and design information of the reception coil are collated with each other, an element of the reception coil that includes the target position is selected, and a coil region to be activated, which includes the selected element, is determined. The target position is specified by a method such as a user designation on the camera image of the subject to be examined before mounting the reception coil, or a user designation on a pre-scan image. Image reconstruction is performed using a signal received by the element in the activated coil region.

Abstract: In one embodiment, a superconducting magnet includes: at least one primary superconducting coil configured to generate a primary magnetic field; at least one secondary superconducting coil configured to generate a secondary magnetic field in a direction opposite to a direction of the primary magnetic field; and a superconducting shim coil configured to surround part or all of an outer surface of at least one of the at least one primary superconducting coil and the at least one secondary superconducting coil and corrects distribution of a static magnetic field generated by both the at least one primary superconducting coil and the at least one secondary superconducting coil.

Abstract: The method includes performing, using a nuclear magnetic resonance (NMR) tool, a Carr-Purcell-Meiboom-Gill (CPMG) measurement by transmitting a first excitation pulse and a first plurality of refocusing pulses, and obtaining a first set of NMR echo signals. The method also includes performing a modified CPMG measurement by transmitting a second excitation pulse and a second plurality of refocusing pulses, and obtaining a second set of NMR echo signals. The second excitation pulse is shifted by 0 or ? radians relative to the first excitation pulse. A first refocusing pulse of the second plurality of refocusing pulses is shifted by 0 or ? radians relative to the second excitation pulse. A subsequent refocusing pulses are shifted by ?/2 or ??/2 radians relative to the second excitation pulse. Further, the method includes obtaining a transient-corrected echo train based on the CPMG measurement and the modified CPMG measurement.

Abstract: A protection circuit senses when one supply circuit in a group is activating to deliver current to a circuit component and issues firing signals to simultaneously activate other supply circuits in the group. The supply circuits may deliver large currents and high power. The protection circuit may prevent damage to a system that might otherwise occur if one supply circuit in the group activates in isolation.

Abstract: In the context of a method according to the disclosure for generating measurement data from an imaging area in a measurement volume of a magnetic resonance system, using a PETRA method, a pulse duration of at least one RF excitation pulse radiated during a single-shot recording method of the PETRA method is extended compared to a pulse duration of RF excitation pulses radiated during a radial recording method of the PETRA method, whereby computing operations for correcting disruptive aliasing may be simplified.

Abstract: Provided is a technology capable of effectively obtaining a ringing correction effect even for a two-dimensional image or a three-dimensional image with a simple CNN configuration. A CNN that has been trained to perform ringing correction for a direction of a dimension lower than a dimension of an image that is a correction target is prepared, and the CNN is applied in multiple stages to perform the ringing correction. For training the CNN, an image captured by increasing a measurement matrix size in one or two directions need only be used, thereby reducing an imaging time for acquiring training data and a burden of data processing, and enabling handling of images of various dimensions.

Abstract: Techniques are provided for imaging a subject. A magnetic resonance imaging (MRI) system may use at least one RF coil to generate an initial MR data set for an initial image of the subject. The MRI system may use the initial MR image to determine a difference in orientation between a current orientation of the subject in the initial MR image and a target orientation of the subject. The MRI system may use the determined difference in orientation to determine an adjustment to a gradient pulse sequence for controlling at least one gradient coil. The MRI system may apply the determined adjustment to the gradient pulse sequence to obtain an adjusted gradient pulse sequence. The MRI system may generate an adjusted MR data set using the adjusted gradient pulse sequence, and a second MR image of the subject using the adjusted MR data set.

Abstract: A brain measurement apparatus includes: a magnetoencephalograph module having a cell; a pump laser configured to emit pump light; a probe laser configured to emit probe light; an optical sensor group configured to detect a polarization plane angle of the probe light having passed through the sensitivity region; a bias magnetic field coil configured to apply a bias magnetic field; and bias magnetic field gradient correction coils configured to correct a gradient of the bias magnetic field; and an MRI module having a transmission coil for transmitting an RF pulse of a predetermined frequency and a receiver coil configured to detect a nuclear magnetic resonance signal. At least one of the coil that applies a static magnetic field and the coil that applies a gradient magnetic field is configured by the same coil as the bias magnetic field coil or the bias magnetic field gradient correction coils.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a main apparatus and a coil apparatus that is separate from the main apparatus. The main apparatus transmits a wireless signal acquired by frequency-modulating a binary signal based on a first clock signal generated from a first system clock. The coil apparatus generates a second clock signal by dividing the received wireless signal, and generates a second system clock from the generated second clock signal. Frequencies of the second system clock and the first system clock are the same.

Abstract: The present disclosure provides a system for MRI. The system may obtain a plurality of echo signals relating to a subject that are excited by an MRI pulse sequence applied to the subject. The system may perform a quantitative measurement on the subject based on the plurality of echo signals. The MRI pulse sequence may include a CEST module configured to selectively excite exchangeable protons or exchangeable molecules in the subject, an RF excitation pulse applied after the CEST module configured to excite a plurality of gradient echoes, and one or more refocusing pulses applied after the RF excitation pulse. Each of the refocusing pulses may be configured to excite one or more spin echoes. The one or more spin echoes excited by at least one of the one or more refocusing pulses may include a symmetric spin echo and one or more asymmetric spin echoes.