[7a-A401-1~11] 2.3 Application, radiation generators, new technology

[7a-A401-1] Triple-gamma imaging simulation of a novel Compton-PET system

〇Yusuke Okumura¹, Eiji Yoshida², Hideaki Tashima², Mikio Suga¹, Naoki Kawachi³, Katia Parodi⁴, Taiga Yamaya^2,1 (1.Chiba Univ., 2.NIRS, QST, 3.QuBS, QST, 4.Ludwig-Maximilians-Univ.)

Keywords:PET, Compton camera, Nuclear medicine

We have proposed a new concept of whole gamma imaging (WGI), which is a combined system of a PET camera and a Compton camera. The WGI concept uses all detectable gamma rays for imaging. An additional detector ring, which is used as the scatter part, is inserted in a conventional PET ring so that single gamma rays can be detected by the Compton imaging method. Therefore, by using triple gamma emitters such as ⁴⁴Sc (e⁺ and the 1157 keV gamma ray) for biological imaging, it is possible to limit the position of the source on the coincidence line. In theory, localization from a single decay is possible by identifying the intersection point between a coincidence line and a Compton cone. In this study, we simulated using ²²Na which emits three gamma rays (e⁺ and the 1274.5 keV gamma ray) similar to ⁴⁴Sc. As the result, the position distribution of the ²²Na point source projected on a line-of-response was 6.2 mm FWHM at the center of the field of view without applying image reconstruction. From the simulation result, it was suggested that WGI can restrict the source position on coincidence line with high accuracy.