Effective Radiofrequency Attenuation Methods to Reduce the Interference Between PET and MRI Systems
Effective Radiofrequency Attenuation Methods to Reduce the Interference Between PET and MRI Systems
复制标题
减少 PET 和 MRI 系统之间干扰的有效射频衰减方法
DOI：
10.1109/trpms.2017.2729620
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发表时间：
2017
影响因子：
4.4
通讯作者：
Yamamoto Seiichi
中科院分区：
文献类型：
--
作者：
Kanno A;Kikuya M;Asayama K;Satoh M;Inoue R;Hosaka M;et al.;Yamamoto Seiichi
本文的目的是确定有效的方法，以减少PET和MRI之间的干扰。首先，作者从理论上计算了射频线圈的磁场和电场随线圈距离的变化，然后利用0.3T MRI和硅光电倍增管（Si-PM）块探测器测量了射频感应噪声信号幅度随线圈距离的变化。虽然磁场和电场都随着与线圈距离的增加而急剧下降，但磁场下降得比电场更快。从实验来看，感应噪声信号随着与线圈的距离增加而迅速下降。根据这些结果，减少PET和MRI之间干扰的最有效方法是采取线圈与Si-PM阵列之间的距离。在探测器周围使用Cu屏蔽在PET/MRI系统中不是非常有效，因为它位于RF磁场占主导地位的近场中。
The purpose of this paper is to identify effective methods to reduce the interference between PET and MRI. First, the author theoretically calculated the magnetic and electrical fields from the radiofrequency (RF) coil as a function of the distance from it. Then with a 0.3-T MRI and a silicon photomultiplier (Si-PM) block detector, the author measured the RF-induced noise signal amplitudes as a function of the distance from the coil. Although both the magnetic and electrical fields decreased dramatically as the distance from the coil increased, the magnetic field decreased more rapidly than the electrical field. From experiments, the induced noise signal decreased rapidly as the distance from the coil increased. With these results, the most effective method to reduce the interference between PET and MRI is taking the distance between the coil and the Si-PM arrays. Using the Cu shield around the detector will not be very effective in PET/MRI systems since it is located in the near field where the magnetic field in RF is dominant.
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