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Three-dimensional asymmetric transverse gradient coils

A technology of gradient coils and coils, used in the measurement of magnetic variables, measuring devices, instruments, etc., can solve the problems of high working current, increase in size and weight, high inductance, etc., and achieve the effect of large conversion rate and low storage magnetic energy.

Inactive Publication Date: 2009-06-10
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the larger coil volume of the asymmetrical local coil leads to relatively higher inductance, higher operating current with consequent reduced gradient strength and slew rate, increased mechanical stress and noise
Due to the added size and weight, the extension of the service end of the coil is inconvenient for local coils intended for selective insertion or removal, or local coils intended to be mounted on a patient couch, etc.
Therefore, existing asymmetric gradient coils are limited in the trade-off between coil size and magnetic field gradient uniformity

Method used

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  • Three-dimensional asymmetric transverse gradient coils
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  • Three-dimensional asymmetric transverse gradient coils

Examples

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Embodiment Construction

[0024] Referring to FIG. 1 , a magnetic resonance scanner 10 includes a scanner housing 12 (shown in cross-section in FIG. 1 ) in which a patient 16 or other subject is at least partially positioned. Although described with reference to a bore-type scanner, it is understood that the scanner could also be an open magnet scanner or other type of magnetic resonance scanner. A protective insulating bore liner 18 of scanner housing 12 optionally lines the substantially cylindrical bore or opening of scanner housing 12 in which object 16 is positioned. A main magnet 20 disposed within the scanner housing 12 is controlled by a main magnet controller 22 to generate a static magnetic field (B 0 ). Typically, the main magnet 20 is a permanent superconducting magnet surrounded by cryoshrouding 24 . In some embodiments, the main magnet 20 produces a main magnetic field of at least about 0.2 Tesla (Tesla), such as 0.23 Tesla, 1.0 Tesla, 1.5 Tesla, 3 Tesla, 7 Tesla, and the like. Magneti...

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Abstract

A transverse magnetic field gradient coil includes a set of primary coil loops (62) defining an operative coil end (66) and a distal coil end (68). The set of primary coil loops are configured to generate a magnetic field gradient in a selected region asymmetrically disposed relatively closer to the operative coil end and relatively further from the distal coil end. A set of shield coil loops (64) are disposed outside the set of primary coil loops and are configured to substantially shield the set of primary coil loops. Two or more current jumps (70) are disposed at the distal end. Each current jump electrically connects an incomplete loop of the set of primary coil loops with an incomplete loop of the set of shield coil loops.

Description

technical field [0001] This application relates to magnetic field gradient coils. It finds exemplary application in magnetic resonance imaging and will be described with reference to examples. However, the present application has more general application in the field of magnetic resonance scanning applications including imaging and spectroscopy, and other applications using magnetic field gradients. Background technique [0002] Magnetic resonance scanners used for medical imaging typically use whole body magnetic field gradient coils disposed within the scanner housing. Magnetic field gradient coils usually consist of one axial / longitudinal gradient coil and two sets of transverse gradient coils that are orthogonal to each other. Such whole-body transverse magnetic field gradient coils are advantageously able to generate magnetic field gradients over a large volume. However, whole body transverse magnetic field gradient coils have relatively greater inductance and use re...

Claims

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Application Information

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IPC IPC(8): G01R33/385G01R33/421
CPCG01R33/4215G01R33/421G01R33/385
Inventor S·M·施瓦茨曼G·D·德梅斯泰M·A·莫里希
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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