Analysis of sample power loss in MRI gradient fields.
Analysis of sample power loss in MRI gradient fields.
复制标题
MRI 梯度场中样本功率损失的分析。
DOI：
10.1118/1.596677
复制
发表时间：
1991
期刊：
影响因子：
3.8
通讯作者：
Harpen,MD
中科院分区：
文献类型：
--
作者：
Harpen,MD
推导了导电球形样品在随时间变化的梯度磁场中的功率耗散，并将预测值与由四元件鞍形线圈和麦克斯韦线圈对组成的实验装置中观察到的结果进行了比较。推导出的功率耗散表达式与加载线圈的实验测量值一致。它还表明，在回波平面成像中遇到的大的快速波动的梯度场产生相对较小的水平的吸收功率。
A derivation of the power dissipation in a conducting spherical sample in a time‐dependent gradient magnetic field is presented and the predicted values are compared with those observed in an experimental apparatus consisting of a four‐element saddle coil and a Maxwell coil pair. The derived expressions for power dissipation are shown to agree with values obtained experimentally viaQmeasurements of the loaded coils. It is also shown the large rapidly fluctuating gradient fields encountered in echo planar imaging produce relatively small levels of absorbed power.