The present invention relates to a method of correcting inhomogeneity of the static magnetic field generated by the magnet of a Nuclear Magnetic Resonance imaging machine, wherein the magnet is flat and the magnetic field on one side of said magnet is corrected such that a volume is defined, which is bounded by a spherical cap surface, in which volume and along which surface the magnetic field is homogeneous, i.e. has field lines having equal parallel directions and equal intensities.

A magnetic resonance arrangement with a permanent magnet system and having magnet elements, pole piece elements and yoke elements of magnetic material arranged cylinder-symmetrically with respect to the z axis. The yoke elements have a first lid (11′) and a second lid (11″) and also a hollow cylindrical drum (12) arranged axially between the lids. The yoke elements enclose the measuring volume in the axial and radial direction. The magnet elements each include a pair of cylinder-symmetrical axial magnets (13′, 13″) and also radial magnet rings (14′, 14″). The axial magnets are each arranged axially adjoining the lids and are arranged radially within the radial magnet rings and respectively axially further away from the measuring volume than the radial magnet rings. The outer diameter of the axial magnets is less than or equal to the inner diameter of the radial magnet rings.

A magnetic resonance arrangement with a permanent magnet system and having magnet elements, pole piece elements and yoke elements of magnetic material arranged cylinder-symmetrically with respect to the z axis. The yoke elements have a first lid (11′) and a second lid (11″) and also a hollow cylindrical drum (12) arranged axially between the lids. The yoke elements enclose the measuring volume in the axial and radial direction. The magnet elements each include a pair of cylinder-symmetrical axial magnets (13′, 13″) and also radial magnet rings (14′, 14″). The axial magnets are each arranged axially adjoining the lids and are arranged radially within the radial magnet rings and respectively axially further away from the measuring volume than the radial magnet rings. The outer diameter of the axial magnets is less than or equal to the inner diameter of the radial magnet rings.

A magnet array (400) includes multiple magnet (411-420) rings and a frame. The multiple magnet rings are positioned along a longitudinal axis and coaxially with the longitudinal axis, wherein at least two of the magnet rings include mixed-phase magnet rings (411, 413) that are phase-dissimilar. The multiple magnet rings are configured to jointly generate a magnetic field along a direction parallel to the longitudinal axis of at least a given level of uniformity inside a predefined inner volume (430). The frame is configured to fixedly hold the multiple magnet rings in place.

A magnet array (400) includes multiple magnet (411-420) rings and a frame. The multiple magnet rings are positioned along a longitudinal axis and coaxially with the longitudinal axis, wherein at least two of the magnet rings include mixed-phase magnet rings (411, 413) that are phase-dissimilar. The multiple magnet rings are configured to jointly generate a magnetic field along a direction parallel to the longitudinal axis of at least a given level of uniformity inside a predefined inner volume (430). The frame is configured to fixedly hold the multiple magnet rings in place.

A magnet array (700) includes multiple magnet rings (711-720) and a frame. The multiple magnet rings are positioned along a longitudinal axis and coaxially with the longitudinal axis, wherein at least one (712, 713, 719) of the magnet rings possesses rotational symmetry and has both a finite component of magnetization along an azimuthal (θ) coordinate, and a finite magnetization in a longitudinal-radial plane. The multiple magnet rings configured to jointly generate a magnetic field along a direction parallel to the longitudinal axis. The frame is configured to fixedly hold the multiple magnet rings in place.

A magnet array (700) includes multiple magnet rings (711-720) and a frame. The multiple magnet rings are positioned along a longitudinal axis and coaxially with the longitudinal axis, wherein at least one (712, 713, 719) of the magnet rings possesses rotational symmetry and has both a finite component of magnetization along an azimuthal (θ) coordinate, and a finite magnetization in a longitudinal-radial plane. The multiple magnet rings configured to jointly generate a magnetic field along a direction parallel to the longitudinal axis. The frame is configured to fixedly hold the multiple magnet rings in place.

A portable nuclear magnetic resonance (NMR) system configured for semi-autonomous or autonomous operation, including a portable NMR device configured to obtain NMR or other sensor data from an environment; a wireless communications device configured to communicate with a remote computing device; and at least one local computing device in communication with the wireless communications device and the NMR/Multisensor device, the at least one local computing device configured to perform operations comprising: receiving the NMR and sensor data that is obtained from the environment by the NMR system; sending, by the wireless communications device, the NMR or sensor data to the remote computing device; receiving, through the wireless communications device, at least one control signal for operating the NMR system in the environment, and the control signal being based on processing by the remote computing device; and causing, based on the control signal, the NMR system to adjust a data collection parameter for obtaining additional NMR and sensor data.

A pre-polarisation magnet arrangement for generating a pre-polarisation field for use in a low field magnetic resonance imaging process, the pre-polarisation magnet arrangement including a pre-polarisation field array including a plurality of permanent pre-polarisation magnets mounted in a support and provided in a circumferentially spaced arrangement surrounding a field of view, a number of the pre-polarisation magnets being movable between respective first and second positions, wherein in the first position the pre-polarisation magnets are configured as a cylindrical Halbach array to generate a pre-polarisation field in the field of view and in the second position the pre-polarisation magnets are configured to minimize the pre-polarisation field in the field of view.

A pre-polarisation magnet arrangement for generating a pre-polarisation field for use in a low field magnetic resonance imaging process, the pre-polarisation magnet arrangement including a pre-polarisation field array including a plurality of permanent pre-polarisation magnets mounted in a support and provided in a circumferentially spaced arrangement surrounding a field of view, a number of the pre-polarisation magnets being movable between respective first and second positions, wherein in the first position the pre-polarisation magnets are configured as a cylindrical Halbach array to generate a pre-polarisation field in the field of view and in the second position the pre-polarisation magnets are configured to minimize the pre-polarisation field in the field of view.