Double-Photon Emission Imaging With High-Resolution Si/CdTe Compton Cameras
Tadashi Orita, Goro Yabu, Hiroki Yoneda, Shin’ichiro Takeda, Pietro Caradonna, Tadayuki Takahashi, Shin Watanabe, Yuusuke Uchida, Fumiki Moriyama, Hirotaka Sugawara, Mizuki Uenomachi, Kenji Shimazoe
Abstract
Application of Compton cameras to nuclear medicine or small animal imaging is a challenging subject. A major issue is insufficient spatial resolutions of the existing Compton camera systems. We developed an imaging system consisting of two Si/CdTe Compton cameras, which allows us to investigate γ- γ coincidence imaging for a variety of radioisotopes, including <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">111</sup> In, which emits double photons of 171 and 245 keV per decay and has been used for a long time in nuclear medicine and many commercialized radiotracers. We demonstrated with it a drastic reduction of a tail of the point spread function, compared with that of the traditional method, and obtained a spatial resolution of 4.5 mm full-width at half-maximum (FWHM) at 41.35 mm.