Abstract #2187

Concept of an RF penetrable oval PET insert for MRI system: initial study of the shielding effect

Md Shahadat Hossain Akram¹, Craig S. Levin², Takayuki Obata¹, Fumihiko Nishikido¹, Eiji Yoshida¹, and Taiga Yamaya¹

¹Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, ²School of Medicine, Stanford University, Stanford, CA, United States

A prototype of a novel oval shape PET insert for simultaneous body imaging with the MRI systems has been proposed in this study. The smaller prototype has the minor axis and major axis of 14 cm and 21 cm. 16 copper shielded boxes are positioned on the periphery of the oval frame. The shielding boxes were kept floating to let the RF field penetrate through the gaps in between the 16 modules. To get the required RF field distribution inside the oval PET, the gaps between the shielded modules were varied by doing assumptions following the conformal electric phase angle methods. B1 maps and GRE and SE images were taken and they have a good agreement with the results for without shielding materials. We have found a reduced RF field value with increased noise in the FOV which is mostly due to shielding materials. The images of GRE and SE have shape distortions due eddy currents.

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