Systems and methods for imaging a subject with a magnetic resonance imaging system using magnetic field gradients generated by one or more gradient coils operating with gradient coil settings, such as gradient amplitudes and gradient slew rates, above a threshold at which peripheral nerve stimulation is likely to be induced in the subject. A dielectric assembly is positioned adjacent a skin surface of the subject such that the dielectric assembly attenuates the local electric fields induced by the magnetic field gradients, which would be likely to induce PNS when the dielectric assembly is not arranged adjacent the skin surface of the subject. As a result of the dielectric assembly placed adjacent the skin surface of the subject, the gradient coil settings can be increased above the threshold without inducing PNS in the subject.

Corrugated paper includes first and second sheets of paper; and a layer of structured paper disposed between the first and second sheets of paper. The layer of structured paper includes cells, in which at least some of the cells are negative Poisson's ratio (NPR) cells. Each NPR cell includes top and bottom walls, and side walls angled inwards toward a central portion of the NPR cell, such that application of a compressive force between the top and bottom walls of the NPR cell causes a lateral dimension of the NPR cell between opposite side walls to decrease. The NPR cells exhibit a Poisson's ratio of between 0 and −1.

Corrugated paper includes first and second sheets of paper; and a layer of structured paper disposed between the first and second sheets of paper. The layer of structured paper includes cells, in which at least some of the cells are negative Poisson's ratio (NPR) cells. Each NPR cell includes top and bottom walls, and side walls angled inwards toward a central portion of the NPR cell, such that application of a compressive force between the top and bottom walls of the NPR cell causes a lateral dimension of the NPR cell between opposite side walls to decrease. The NPR cells exhibit a Poisson's ratio of between 0 and −1.

Systems and methods for imaging a subject with a magnetic resonance imaging system using magnetic field gradients generated by one or more gradient coils operating with gradient coil settings, such as gradient amplitudes and gradient slew rates, above a threshold at which peripheral nerve stimulation is likely to be induced in the subject. A dielectric assembly is positioned adjacent a skin surface of the subject such that the dielectric assembly attenuates the local electric fields induced by the magnetic field gradients, which would be likely to induce PNS when the dielectric assembly is not arranged adjacent the skin surface of the subject. As a result of the dielectric assembly placed adjacent the skin surface of the subject, the gradient coil settings can be increased above the threshold without inducing PNS in the subject.

Systems and methods for imaging a subject with a magnetic resonance imaging system using magnetic field gradients generated by one or more gradient coils operating with gradient coil settings, such as gradient amplitudes and gradient slew rates, above a threshold at which peripheral nerve stimulation is likely to be induced in the subject. A dielectric assembly is positioned adjacent a skin surface of the subject such that the dielectric assembly attenuates the local electric fields induced by the magnetic field gradients, which would be likely to induce PNS when the dielectric assembly is not arranged adjacent the skin surface of the subject. As a result of the dielectric assembly placed adjacent the skin surface of the subject, the gradient coil settings can be increased above the threshold without inducing PNS in the subject.

A magnet arrangement arranged radially around a sample volume generates a changing magnetic field B with a z-direction component A circuit board arrangement (6; 14) is arranged radially within the magnet arrangement and has electrical conductor tracks (7; 12) divided into conductor track sections (10), at least two adjoining ones of which form a structure section (11a, 11b) spanning an area (A1, A2). For each conductor track (7; 12), two structure sections (11a, 11b) respectively form a structure section pair (11), wherein the conductor tracks are arranged on the circuit board arrangement (6; 14) such that equal and opposite voltages and/or currents are induced by a change in the magnetic field B of the magnet arrangement in the two structure sections of each structure section pair. As a result, eddy currents and resultant interference in the circuit board and the components thereof are avoided or at least minimized.

A magnetic field measurement system for measurement of weak magnetic field signals or a wearable assembly includes at least one magnetometer and a shield disposed around the magnetometer. The shield includes a first portion configured for positioning between the at least one magnetometer and a source of the weak magnetic field signals. The first portion is made of an amplitude-selective magnetic shield (ASMS) that preferentially passes magnetic fields having a magnetic field amplitude below a threshold (for example, 500 nT or less) and shields magnetic fields having a larger magnetic field amplitude.

A magnetic field measurement system for measurement of weak magnetic field signals or a wearable assembly includes at least one magnetometer and a shield disposed around the magnetometer. The shield includes a first portion configured for positioning between the at least one magnetometer and a source of the weak magnetic field signals. The first portion is made of an amplitude-selective magnetic shield (ASMS) that preferentially passes magnetic fields having a magnetic field amplitude below a threshold (for example, 500 nT or less) and shields magnetic fields having a larger magnetic field amplitude.

The present disclosure relates to a method and a system for minimizing electromagnetic interference (EMI) of magnetic resonance imaging (MRI) systems in complex electromagnetic environments. The method and system described herein provide superior MRI image quality and may reduce costs by eliminating the requirement of expensive shielding in MRI systems/hybrid MRI systems.

A magnetic resonance imaging (MRI) system, comprising a magnetics system having a plurality of magnetics components configured to produce magnetic fields for performing magnetic resonance imaging, electromagnetic shielding provided to attenuate at least some electromagnetic noise in an operating environment of the MRI system, and an electrical conductor coupled to the electromagnetic shielding and configured to electrically couple to a patient during imaging of the patient by the MRI system. The magnetics system may include at least one permanent B.sub.0 magnet configured to produce a B.sub.0 magnetic field for an imaging region of the MRI system. The B.sub.0 magnetic field strength may be less than or equal to approximately 0.2 T.