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Gradient shield coil with meandering winding for magnetic resonance imaging MRI apparatus

一种屏蔽线圈、梯度线圈的技术，应用在MRI成像领域，能够解决耗散等问题

Pending Publication Date: 2020-12-04
KONINKLIJKE PHILIPS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic fields generated by the gradient coils can induce eddy currents and thus cause dissipation in the superconducting coils and in the conducting structures inside the superconducting magnets

Method used

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  • Gradient shield coil with meandering winding for magnetic resonance imaging MRI apparatus
  • Gradient shield coil with meandering winding for magnetic resonance imaging MRI apparatus
  • Gradient shield coil with meandering winding for magnetic resonance imaging MRI apparatus

Examples

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Embodiment Construction

[0043] figure 1 An MRI apparatus 1 according to a preferred embodiment of the invention is schematically depicted in a cross-sectional view. The MRI apparatus 1 includes a superconducting magnet 2 for generating a main magnetic field (B0 field) of the MRI apparatus 1 . The superconducting magnet 2 comprises superconducting coils, since magnetic fields of several Tesla are usually required for MRI imaging. For imaging, this magnetic field is used to align the nuclear spins of atoms in an examination object, usually a patient 12 on a patient table 11 in a bore 14 of the MRI apparatus 1 . During an MRI scan, the RF coil 3 is used to generate radio frequency (RF) pulses to cause perturbations to the local magnetic field. In this way, the orientation of the nuclear spins with respect to the B0 field can be controlled. For the spatial encoding of the magnetic spins, gradient coils 4 are provided, ie x, y and z gradient coils 4 , which superimpose magnetic field gradients on the B...

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PUM

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Abstract

The invention relates to a gradient shield coil (5) for a MRI apparatus (1). The gradient shield coil (5) according to the invention comprises windings (6, 7) around its longitudinal axis (A), whereinat least one winding (7) is arranged as a meandering winding (7). This meandering winding (7) comprises multiple contiguous sections (8) along its circumference, wherein in each of these sections (8)a pair of conductor loops (9, 10) is provided in such a way that a current in the meandering winding (7) would run in opposite directions in the two conductor loops (9, 10). In this way, dissipationin the superconductive coils of a superconductive magent (2) of a respective MRI apparatus (1) may be further reduced.

Description

technical field [0001] The present invention relates to the field of MRI imaging, and in particular to gradient shielding coils for MRI devices. Background technique [0002] Magnetic fields are used in magnetic resonance imaging (MRI) to align the nuclear spins of atoms as part of the process of producing images inside a patient. This magnetic field is called the main magnetic field or the B0 field. During an MRI scan, radio frequency (RF) pulses generated by transmitters or amplifiers and antennas cause perturbations to the local magnetic field and can be used to manipulate the orientation of nuclear spins relative to the B0 field. The spatial encoding of the magnetic spins can be achieved by using so-called gradient coils for superimposing magnetic field gradients on the B0 magnetic field. The RF signals emitted by the nuclear spins are detected by receiver coils, and these RF signals are used to generate MRI images. [0003] The magnets used to generate the B0 field t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/421
CPCG01R33/4215G01R33/3815G01R33/385
Inventor J·A·奥弗韦格
Owner KONINKLIJKE PHILIPS NV
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