Tomographic Imaging by a Si/CdTe Compton Camera for ¹¹¹In and ¹³¹I Radionuclides

Tomographic imaging with radionuclides commonly used in nuclear medicine, such as $^{111}$In (171 and 245 keV) $^{131}$I (364 keV), is high demand for medical applications small animal imaging. The Si/CdTe Compton camera its angular energy resolutions an especially promising detector to extend the coverage range that covers gamma-ray emitted from these radionuclides. Here, we take first steps towards short-distance by conducting experiments using three-dimensional phantoms composed of multiple sphere-like solutions a diameter 2.7 mm, placed at distance 41 mm. Using simple back-projection methods, positions sources are reproduced spatial resolution 11.5 mm 9.0 (FWHM) $^{131}$I, respectively. We found LM-MLEM method gives better 4.0 (FWHM). resolve source tetrahedron structure source-to-source separation 28 These findings demonstrate Cameras have potential close-distance radioisotopes distributions below 400 keV.