AN ISPA-CAMERA FOR GAMMA-RAYS IN NUCLEAR-MEDICINE

The ISPA (Imaging Silicon Pixel Array)-tube is a position-sensitive ph oton detector. Originally developed for HEP applications, it can also be envisaged for biomedical applications. By coupling it to scintillat ing crystals or crystal arrays (YAP) we built a gamma-camera and detec ted through a collimator the 122 keV gamma-rays from a Co-57 source. T his paper presents the results obtained with two different ISPA-tube p rototypes: the first ISPA-tube, having a glass fibre optic input windo w, allows to achieve very high spatial resolutions; the second ISPA-tu be prototype, with its non fibre optic quartz input window, leads to m uch better energy resolutions while preserving sub-millimetric spatial resolutions.