title: Evaluation of Compton gamma camera prototype based on pixelated CdTe detectors.
abstract: A proposed Compton camera prototype based on pixelated CdTe is simulated and evaluated in order to establish its feasibility and expected performance in real laboratory tests. The system is based on module units containing a 2×4 array of square CdTe detectors of 10×10 mm2area and 2 mm thickness. The detectors are pixelated and stacked forming a 3D detector with voxel sizes of 2 × 1 × 2 mm3. The camera performance is simulated with Geant4-based Architecture for Medicine-Oriented Simulations(GAMOS) and the Origin Ensemble(OE) algorithm is used for the image reconstruction. The simulation shows that the camera can operate with up to 104Bq source activities with equal efficiency and is completely saturated at 109Bq. The efficiency of the system is evaluated using a simulated18Fpoint source phantom in the center of the Field-of-View (FOV) achieving an intrinsic efficiency of 0.4 counts per second per kilobecquerel. The spatial resolution measured from the point spread function (PSF) shows a FWHM of 1.5 mm along the direction perpendicular to the scatterer, making it possible to distinguish two points at 3 mm separation with a peak-to-valley ratio of 8.
authors.affiliation: Instituto de Física de Altas Energías (IFAE), Edificio Cn, Universidad Autónoma de Barcelona (UAB), E-08193 Bellaterra (Barcelona), Spain.
authors.forename: Y
authors.initials: Y
authors.lastname: Calderón
authors.affiliation: Instituto de Física de Altas Energías (IFAE), Edificio Cn, Universidad Autónoma de Barcelona (UAB), E-08193 Bellaterra (Barcelona), Spain.
authors.forename: M
authors.initials: M
authors.lastname: Chmeissani
authors.affiliation: Instituto de Física de Altas Energías (IFAE), Edificio Cn, Universidad Autónoma de Barcelona (UAB), E-08193 Bellaterra (Barcelona), Spain.
authors.forename: M
authors.initials: M
authors.lastname: Kolstein
authors.affiliation: Instituto de Física de Altas Energías (IFAE), Edificio Cn, Universidad Autónoma de Barcelona (UAB), E-08193 Bellaterra (Barcelona), Spain.
authors.forename: G
authors.initials: G
authors.lastname: De Lorenzo
keywords: Compton imaging; Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc); Solid state detectors