Abstract: A magnetic resonance imaging device may include a field generator for generating at least one magnetic gradient field. The field generator may include a first magnet and a second magnet confining an imaging volume of the magnetic resonance imaging device in two spatial directions. The first magnet and the second magnet may be arranged asymmetrically with respect to the imaging volume. The magnetic resonance imaging device may be used to perform a method for acquiring an image of a diagnostically relevant body region of a patient.

Abstract: A magnetic resonance imaging device having a field generation unit configured to provide a magnetic field in an imaging volume of the magnetic resonance imaging device. The field generation unit has at least one magnet. A surface of the field generation unit directed towards the imaging volume of the at least one magnet has a concave shape, wherein a direction of access to the imaging volume is oriented essentially perpendicular to a main direction of magnetic field lines in the imaging volume.

Abstract: A magnetic resonance device for acquiring magnetic resonance data of an object, the magnetic resonance device including a main magnet operable to provide a main magnetic field along at least one surface of the main magnet, wherein the main magnet comprises: a first magnet segment; a second magnet segment; and a cavity to accommodate the second magnet segment, wherein the second magnet segment is arranged in the cavity of the main magnet, and wherein the second magnet segment is variably positioned and/or oriented relative to the first magnet segment to adjust a magnetic field contribution of the second magnet segment to the main magnetic field.

Abstract: A magnetic resonance imaging system comprises a field generation unit and a supporting structure for providing structural support for the field generation unit, wherein the field generation unit comprises at least one magnet for generating a B0 magnetic field and an opening configured to provide access to an imaging volume positioned in the B0 magnetic field along at least one direction and wherein the at least one direction is angled with respect to a main direction of magnetic field lines of the B0 magnetic field in the imaging volume.

Abstract: A magnetic resonance imaging device having a field generation unit configured to provide a magnetic field in an imaging volume of the magnetic resonance imaging device. The field generation unit has at least one magnet. A surface of the field generation unit directed towards the imaging volume of the at least one magnet has a concave shape, wherein a direction of access to the imaging volume is oriented essentially perpendicular to a main direction of magnetic field lines in the imaging volume.

Abstract: A magnetic resonance apparatus, for acquiring magnetic resonance data from a person who is asleep, includes a person support apparatus to provide a sleeping place; an acquisition arrangement including a radiofrequency coil arrangement for transmitting excitation pulses and for receiving magnetic resonance signals; and a controller, designed to operate the acquisition arrangement according to a magnetic resonance sequence for acquiring a magnetic resonance dataset from a region under examination of the person. The magnetic resonance apparatus includes a main magnetic field of strength less than 20 mT, in particular less than 10 mT, and the controller includes an acquisition unit for acquiring a magnetic resonance dataset via a prolonged magnetic resonance sequence having a total acquisition duration of more than one hour.

Abstract: A magnetic resonance imaging device may include a field generator for generating at least one magnetic gradient field. The field generator may include a first magnet and a second magnet confining an imaging volume of the magnetic resonance imaging device in two spatial directions. The first magnet and the second magnet may be arranged asymmetrically with respect to the imaging volume. The magnetic resonance imaging device may be used to perform a method for acquiring an image of a diagnostically relevant body region of a patient.

Abstract: A method for determining a simulation value describing a safety-related variable for an MR measurement includes providing an MR pulse sequence that is configured to perform an MR measurement of a patient using an MR scanner based on the MR pulse sequence. The MR pulse sequence includes a temporal succession of RF pulses and gradient pulses. A patient value describing a characteristic of the patient is provided. Based on the MR pulse sequence and the patient value, the simulation value is determined by a computing unit. The simulation value describes a safety-relevant variable for performing an MR measurement using the MR pulse sequence. For determining the simulation value, specific characteristics of the RF pulses and of the gradient pulses of the MR pulse sequence as well as a temporal succession of the RF pulses and the gradient pulses are taken into account.

Abstract: A magnet arrangement is for use in a magnetic resonance imaging system including at least one magnet including a high temperature superconductor to provide a magnetic field in an imaging volume for acquiring magnetic resonance imaging data. A magnetic resonance imaging system includes a magnet arrangement with at least one magnet, including a high temperature superconductor, to confine an imaging volume in at least one spatial direction. The magnetic resonance imaging system is configured to acquire magnetic resonance imaging data from at least a body region of a patient positioned in the imaging volume. Further a method is for manufacturing a magnet arrangement via an additive manufacturing device, including aligning a first magnet segment with a second magnet segment and bringing the first magnet segment into contact with the second magnet segment; and performing a joining process to bond the first magnet segment to the second magnet segment.

Abstract: At least one example embodiment provides a magnetic resonance imaging system comprising a field generation unit and a supporting structure for providing structural support for the field generation unit, wherein the field generation unit comprises at least one magnet for generating a B0 magnetic field and an opening configured to provide access to an imaging volume positioned in the B0 magnetic field along at least one direction and wherein the at least one direction is angled with respect to a main direction of magnetic field lines of the B0 magnetic field in the imaging volume.

Abstract: A magnetic resonance apparatus, for acquiring magnetic resonance data from a person who is asleep, includes a person support apparatus to provide a sleeping place; an acquisition arrangement including a radiofrequency coil arrangement for transmitting excitation pulses and for receiving magnetic resonance signals; and a controller, designed to operate the acquisition arrangement according to a magnetic resonance sequence for acquiring a magnetic resonance dataset from a region under examination of the person. The magnetic resonance apparatus includes a main magnetic field of strength less than 20 mT, in particular less than 10 mT, and the controller includes an acquisition unit for acquiring a magnetic resonance dataset via a prolonged magnetic resonance sequence having a total acquisition duration of more than one hour.

Abstract: In a magnetic resonance apparatus and a method for operation thereof, at least one electrical operating value of at least one predetermined component of the apparatus is captured and, as a function of the at least one operating value, at least one coil operating value of a transmitting coil arrangement of the magnetic resonance apparatus is controlled for the purpose of limiting a B1 value.

Abstract: An apparatus and a method for spatial encoding in magnetic resonance tomography using a radio frequency signal are provided. A first set of parameters from a first frequency and from a first amplitude, and from a second frequency and a second amplitude is determined by the magnetic resonance tomograph, and corresponding signals are generated by a radio frequency device and transmitted by an antenna apparatus. A first gradient above the Larmor frequency of the nuclear spins is generated by the Bloch-Siegert effect. The same thing ensues with a second set of parameters that differs from the first set of parameters at least in one frequency or amplitude and therefore generates a second, different gradient.

Abstract: A method for correcting a B0 inhomogeneity in a magnetic resonance scan with a magnetic resonance tomograph is provided. The magnetic resonance tomograph includes a controller, a radio frequency unit, and a transmitting antenna. In the method, the controller determines a transmission signal that is suitable for correcting an effect of an inhomogeneity of a static B0 magnetic field in an examination volume by the Bloch-Siegert effect. The transmission signal is emitted into the examination volume.

Abstract: A method for monitoring a temporal change in a magnetic field in a magnetic resonance device, as well as an evaluation unit, a magnetic resonance device, and a computer program product for performing the method are provided. The method provides that a position-dependent magnetic field distribution that is produced by the plurality of gradient coils is provided with a plurality of monitoring points. In addition, time-dependent gradient values of the plurality of gradient coils are ascertained. Based on position-dependent magnetic field distribution and the time-dependent gradient values, the temporal change in the magnetic field is ascertained. The temporal change in the magnetic field is monitored by comparing the temporal change in the magnetic field with at least one limit value.

Abstract: A method for correcting a B0 inhomogeneity in a magnetic resonance scan with a magnetic resonance tomograph is provided. The magnetic resonance tomograph includes a controller, a radio frequency unit, and a transmitting antenna. In the method, the controller determines a transmission signal that is suitable for correcting an effect of an inhomogeneity of a static B0 magnetic field in an examination volume by the Bloch-Siegert effect. The transmission signal is emitted into the examination volume.

Abstract: An apparatus and a method for spatial encoding in magnetic resonance tomography using a radio frequency signal are provided. A first set of parameters from a first frequency and from a first amplitude, and from a second frequency and a second amplitude is determined by the magnetic resonance tomograph, and corresponding signals are generated by a radio frequency device and transmitted by an antenna apparatus. A first gradient above the Larmor frequency of the nuclear spins is generated by the Bloch-Siegert effect. The same thing ensues with a second set of parameters that differs from the first set of parameters at least in one frequency or amplitude and therefore generates a second, different gradient.

Abstract: In a method and magnetic resonance (MR) apparatus for avoidance of artifacts in the acquisition of MR data, first and second undersampled datasets are recorded, the measurement data of each dataset being selected such that artifacts in the first dataset exhibit a phase other than in the second dataset, and the measurement data in the first and second datasets, even when combined, correspond to undersampled dataset. The recorded, undersampled datasets are supplemented with the use of a supplementary kernel of a parallel acquisition method to form supplemented datasets from which a combined, artifact-free dataset is produced. Measurement time is thereby reduced overall compared with customary PAT averaging and compared with recording without the use of a parallel acquisition method.

Abstract: A circuit arrangement for an MRT system and a method for operating an MRT system are disclosed. The circuit arrangement includes a gradient amplifier having a switch-mode output stage, a regulator device, and a modulator connected therebetween in the circuit. To ensure patient safety, a control path is integrated into a drive path of the circuit arrangement or the MRT system provided for driving a gradient coil, the gradient coil being connected to an output of the switch-mode output stage. The control path includes a limiter stage connected downstream of the regulator device, the modulator, the switch-mode output stage and its supply voltage. The limiter stage is connected in the circuit between the regulator device and an input of the modulator, to limit a control signal output by the regulator device and limit the voltage for the gradient coil provided by the switch-mode output stage at its output.

Abstract: In a method and an apparatus for magnetic resonance tomography, an eddy current field is compensated by taking into account its progression over time and its dependence on a sensed value, by having a sensor determine the sensed value and, on the basis of the sensed value, a current strength for a conductor in order to generate an opposing field to reduce the eddy current field is determined, and supplied to the conductor.