Abstract #2193

Bo and SAR calculation for a full-ring human head PET system integrated with an 8-element Birdcage coil at 3T

Md Shahadat Hossain Akram¹, Takayuki Obata¹, Mikio Suga², Fumihiko Nishikido¹, Eiji Yoshida¹, and Taiga Yamaya¹

¹National Institute of Radiological Sciences, Chiba, Japan, ²Chiba University, Chiba, Japan

Simultaneous PET/MRI system has attracted much because of its both functional and anatomic imaging capability. In our laboratory, we have developed a human head-size PET/RF-coil integrated modality to be used with existing clinical 3T MRI system (Siemens Magnetom Verio). Eight PET detector modules are integrated with a cylindrical 8-element Birdcage RF coil for simultaneous PET and MRI imaging. In the design each detector has been integrated in between two coil elements. RF interference to PET detector circuits affects PET performance. Also noise generated from PET circuits affects MR image quality. For proper simultaneous operation, PET circuits in each detector-module were installed inside a copper-shielded box. But shielding materials very close to RF coil elements and close to imaging region adversely affects MR imaging quality. In this study we performed B_o and SAR calculation of our hybrid system. Though there have noticeable changes in the B_o values, the SAR remains very low.

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