Systems and methods of PET attenuation correction using low-field MR image data includes receiving a first set of image data and a set of low-field magnetic resonance (MR) image data. An attenuation correction map is generated from the low-field MR image data using a first trained neural network. At least one attenuation correction process is applied to the first set of image data based on the attenuation correction map to generate at least one clinical attenuation-corrected image.

Techniques for compensating magnetic resonance imaging (MRI) data for artefacts caused by motion of a subject being imaged. The techniques include obtaining spatial frequency data obtained by using a magnetic resonance imaging (MRI) system to perform MRI on a patient, the spatial frequency data including first spatial frequency data and second spatial frequency data; determining a transformation using a first image obtained using the first spatial frequency data and a second image obtained using the second spatial frequency data; determining a residual spatial phase; correcting, using the transformation, second spatial frequency data and the residual spatial phase, to obtain corrected second spatial frequency data and a corrected residual spatial phase; and generating a magnetic resonance (MR) image using the corrected second spatial frequency data and the corrected residual spatial phase.

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.

A magnetic resonance device having a main magnet unit with a cylindrical patient aperture. A gradient connection plate for a gradient coil arrangement surrounds the patient aperture. A cladding arrangement with at least one cladding part outwardly delimits the main magnet unit.

An MRI apparatus equipped with a magnetic shield structure to reduce flux leakage. The MRI apparatus includes: a pair of static magnetic magnets that are disposed on opposite sides of an imaging space; and a pair of gradient coils that are disposed on opposite sides of the imaging space. Each static magnetic magnet has a disk-shaped magnetic material pole 201 and a ring-shaped magnetic material pole 202. Each gradient coil has a first coil 204 that applies a magnetic field gradient in a Z axis direction in an imaging region, and a laminate 301 that shields the disk-shaped magnetic material pole from magnetic flux produced in the first coil. The laminate has a smaller thickness in the Z axis direction on the ring-shaped magnetic material pole side than that in a center portion of the imaging space. A vertical lowest portion of a laminate end portion on the ring-shaped magnetic material pole side of the laminate is in a higher position than a position of a lowest portion of a laminate central portion on the imaging region side of the laminate.

The invention relates to an MRI apparatus and a method of MRI involving the acquisition of a first and a second MRI image with mutually different orientations between the BO magnetic field and the object to be investigated. For instance, when imaging structures such as a tendon, due to the magic angle effect, this results in a change in image contrast. According to the invention, a coregistration can be performed between the first and the second MRI image. Moreover, the orientation of a structure within the object can be determined on the basis of the different orientations and the image intensity in the first and the second MRI image. The invention further discloses an apparatus for carrying out the method and a method of shimming the BO magnetic field of the apparatus.

The present application provides a method of designing a high shielding gradient coil for a planar superconducting magnetic resonance imaging (MRI) system and a gradient coil thereof, the method determines a shielding area according to an outer profile of a metal conductor around the position of the gradient coil in the planar superconducting MRI system, and performs partitioned shielding of a stray field. The constraint values of stray fields at different partitioned zones of the shielding area are adjusted according to the shielding requirements. The primary coils of both the transverse gradient coil and the longitudinal gradient coil optimized by the design method of the high shielding gradient coil contain a reverse coil, which generates a magnetic field that offsets leakage magnetic field of other coils, thus achieving the purpose of reducing the stray field of the gradient coil.

In a method for performing a magnetic resonance measurement of an organ structure of a patient using a magnetic resonance imaging system adapted to the imaging of the organ structure: a correct positioning of the organ structure of the patient is ascertained, a correct positioning of the magnetic resonance imaging system with regard to the positioning of the organ structure of the patient is ascertained, a magnetic resonance scanning protocol is selected, a spatial coverage of the magnetic resonance measurement with regard to the organ structure to be imaged is adjusted, and the magnetic resonance measurement is performed to acquire magnetic resonance image data of the organ structure.

A magnetic resonance imaging (MRI) apparatus is disclosed. The MRI apparatus includes a plurality of magnetic elements affixed in a Halbach dome structure. The Halbach dome structure defines an access aperture configured to allow access to the patient's head to enable neural intervention and defines a patient opening configured to receive a patient's head. In various aspects, the Halbach dome comprises a plurality of access apertures and/or gaps that may be adjustable in size.

Systems and methods for the delivery of linear accelerator radiotherapy in conjunction with magnetic resonance imaging in which components of a linear accelerator may be placed in shielding containers around a gantry, may be connected with RF waveguides, and may employ various systems and methods for magnetic and radio frequency shielding.