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Gradient coil arrangement

A technology of gradient coils and coil devices, which can be used in measuring devices, medical science, electromagnets without armatures, etc., and can solve problems such as difficult to obtain combinations with vacuum insulation

Inactive Publication Date: 2005-11-09
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in this case it is very difficult to achieve a combination with vacuum insulation

Method used

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Embodiment Construction

[0021] In the MR apparatus shown in cross-section in FIG. 1 , reference 1 designates a position on a table of an object 2 to be examined, eg a patient. The object is arranged at an isocenter 3 of several coil arrangements surrounding the object 2 in the shape of a cylinder. In order to excite and / or receive MR signals from the area to be examined, the object 2 is first surrounded by a high-frequency coil arrangement 10, for example embodied in the shape of a birdcage and, as shown in the example, has a vertical Eight conductors extending in the plane of projection in FIG. 1 . In order to generate gradient magnetic fields in the three spatial directions x, y and z of the Cartesian coordinate system, different gradient coil arrangements are provided which also surround the object 2 in a ring shape and which are each arranged on a cylinder surface.

[0022] In order to generate a gradient magnetic field extending in the x-direction, an x-gradient coil arrangement is provided whi...

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Abstract

The invention relates to a gradient coil arrangement for the generation of a gradient magnetic field for an MR arrangement with at least two gradient coils arranged on a cylinder surface with a substantially circular cross section. In order to enable adjustment of gradient fields extending as linearly as possible in the area of an object to be examined without having to modify the entire mechanical structure of the MR arrangement and without having to increase the power required to feed the gradient coil arrangement, it is proposed according to the invention to configure the gradient coils so as to be asymmetrical in relation to a central plane lying horizontally through the longitudinal axis of the cylinder.

Description

technical field [0001] The invention relates to a gradient coil arrangement for generating a gradient magnetic field of an MR system, with at least two gradient coils arranged on the surface of a cylinder with a substantially circular cross section. The invention also relates to a coil arrangement for an MR device and the MR device itself. Background of the invention [0002] Gradient coil arrangements of this type are used in all magnetic resonance setups (MR devices) to superimpose gradient magnetic fields in the x, y and z directions on a static magnetic field. The gradient coils are then placed on several layers within the main field magnet on the surface of a cylinder with a circular cross section, within which the patient is placed for examination. [0003] In order to scan the patient more quickly and obtain the required images more quickly, the gradient coils have to be switched more quickly, for which the necessary gradient magnetic fields have to be generated more...

Claims

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Application Information

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IPC IPC(8): A61B5/055G01R33/385H01F7/20
CPCG01R33/385
Inventor C·L·G·哈姆J·A·奥维韦格G·N·皮伦
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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