Author/Authors :
Amendolia، نويسنده , , S.R and Bisogni، نويسنده , , M.G. and Bottigli، نويسنده , , U. and Delogu، نويسنده , , P. and Dipasquale، نويسنده , , G. and Fantacci، نويسنده , , M.E. and Marchi، نويسنده , , A. and Marzulli، نويسنده , , V.M. and Oliva، نويسنده , , P. and Palmiero، نويسنده , , R. Del Rosso، نويسنده , , V. and Stefanini، نويسنده , , A. and Stumbo، نويسنده , , S. and Zucca، نويسنده , , S.، نويسنده ,
Abstract :
We are studying the performance of various thickness GaAs pixel detectors bump-bonded to a dedicated photon counting chip (PCC) for medical imaging applications in different energy ranges. In this work we present the experimental results obtained with a 600 μm thick pixel matrix (64×64 square pixels, 170 μm side) in the 60–140 keV energy range to evaluate the possible use of such a system in the nuclear medicine field. In particular, we have measured the spectroscopic properties of the detector (charge collection efficiency, energy resolution and detection efficiency) and evaluated the discrimination capability of the electronics. Then we have measured the imaging properties of the whole system in terms of Point Spread Function and using a home made thyroid phantom. We present also a comparison with a traditional gamma camera and an evaluation, made by both experimental measurements and software simulations, of the imaging characteristics related to the use of a collimation system.
