THE FIELD-DEPENDENCE OF NMR IMAGING .1. LABORATORY ASSESSMENT OF SIGNAL-TO-NOISE RATIO AND POWER DEPOSITION
THE FIELD-DEPENDENCE OF NMR IMAGING .1. LABORATORY ASSESSMENT OF SIGNAL-TO-NOISE RATIO AND POWER DEPOSITION
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DOI：
10.1002/mrm.1910030508
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发表时间：
1986-10-01
影响因子：
3.3
通讯作者：
HOULT, DI
中科院分区：
文献类型：
--
作者：
CHEN, CN;SANK, VJ;HOULT, DI
提出了一种在实验台上测量射频探针的核磁共振信噪比（在1-100 MHz范围内）和成像实验中沉积在患者体内的功率的方法。该技术基于互易原理，即匹配的探测线圈（在传输时）产生的磁场与用作接收器时由同一线圈提供的信噪比之间存在直接关系。描述了用于测量磁场的校准感测线圈的构造和使用，并概述了准确测量和理解所需的注意事项和理论。最后，通过与放置在核磁共振成像设备中的小掺杂水样的直接光谱测量灵敏度进行比较，验证了该方法。©1986学术出版社，Inc。
A method is proposed for measuring on the bench the NMR signal‐to‐noise ratio of rf probes, (over the range 1–100 MHz) and also the power deposited in patients during the imaging experiment. The technique is based on the principle of reciprocity, in that a direct relationship exists between the magnetic field generated (upon transmission) by a matched probe coil and the signal‐to‐noise ration delivered by the same coil when used as a receiver. The construction and use of a calibrated sense coil for measuring the field is described, and the precautions and theory necessary for accurate measurement and understanding are outlined. Finally, the method is verified by comparison with a direct spectral measure of sensitivity obtained from a small doped water sample placed in NMR imaging equipment. © 1986 Academic Press, Inc.