Feasibility study on the development of a fiber-optic gamma imaging probe

In this research, we fabricated a fiber-optic gamma imaging probe that could measure the scintillation image induced by gamma-rays. For evaluating the spatial resolution of the optical and the scintillation images measured by using the proposed gamma imaging probe, first, we obtained the light intensity distributions across the sharp edge from the optical and the scintillation images by using a USAF 1951 resolution target and an X-ray beam and then analyzed each modulation transfer function (MTF) curve. Next, we measured the scintillation images with information regarding the distribution by the gamma-rays emitted from Cs-137 sources with four different radioactivities. Finally, we evaluated the intensity variation of the scintillating light from the region of interest (ROI) in the scintillation image according to the radioactivity of Cs-137.