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Self-shielded gradients and method of designing and producing self-shielded gradients

机译：自屏蔽渐变以及设计和生成自屏蔽渐变的方法

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摘要

A self-shielded gradient adapted to be disposed within a main magnet field of an MRI scanner includes a gradient coil having a shield current distribution J_sbased on current density components φ_non a gradient surface where;

<math overflow="scroll"><mrow><msub><mi>J</mi><mi>s</mi></msub><mo>=</mo><mrow><munder><mo>∑</mo><mi>n</mi></munder><mo>⁢</mo><mstyle><mspace width="0.3em" height="0.3ex" /></mstyle><mo>⁢</mo><mrow><msub><mi>a</mi><mi>n</mi></msub><mo>⁢</mo><mrow><msub><mi>ϕ</mi><mi>n</mi></msub><mo>.</mo></mrow></mrow></mrow></mrow></math>

The current distribution is a predetermined value within a volume defined by a periphery of the gradient coil. The current distribution is substantially zero outside the periphery of the gradient coil. According to a method of producing a self-shielded gradient, a shield current distribution J_sis determined based on current density components φ_non a gradient surface where;

<math overflow="scroll"><mrow><mrow><msub><mi>J</mi><mi>s</mi></msub><mo>=</mo><mrow><munder><mo>∑</mo><mi>n</mi></munder><mo>⁢</mo><mstyle><mspace width="0.3em" height="0.3ex" /></mstyle><mo>⁢</mo><mrow><msub><mi>a</mi><mi>n</mi></msub><mo>⁢</mo><msub><mi>ϕ</mi><mi>n</mi></msub></mrow></mrow></mrow><mo>,</mo></mrow></math>

by using an optimization technique, and a gradient coil is constructed according to the shield current distribution. The current distribution is a predetermined value within a volume defined by a periphery of the gradient coil. The current distribution is substantially zero outside the periphery of the gradient coil.

机译：适用于放置在MRI扫描仪主磁场中的自屏蔽梯度包括一个梯度线圈，该梯度线圈具有基于电流密度分量φ_{n 的屏蔽电流分布J _{s 在梯度表面上 $<！[CDATA [<数学溢出=“ scroll”> Js=\sumn$}}

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公开/公告号US7382133B1

专利类型
公开/公告日2008-06-03

原文格式PDF
申请/专利权人 TERRY MORRONE;
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申请/专利号US20060413269
发明设计人 TERRY MORRONE;
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申请日2006-04-28
分类号G01V3/00;
国家 US
入库时间 2022-08-21 20:10:19

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