Patent ID: 7476863
Filing Date: 2009-01-13
Classification: G01T

Abstract:
1. Device limiting the appearance of decoding artefacts for a gamma camera with a coded mask ( 1 ) comprising a gamma radiation detector ( 3 ) opposite the coded mask and having a field of view with an area partially coded ( 20 ) by the coded mask, characterised in that it comprises a recessed part ( 30 ), which is opaque to the gamma radiation, to be arranged opposite the detector ( 3 ) with respect to the coded mask ( 1 ), with said recessed part ( 30 ) obscuring the partially coded area ( 20 ) of the field of view for the detector ( 3 ) and having a thickness that varies over its length, so that a gamma photon is stopped by the same thickness of material, regardless of its path between the partially coded area ( 20 ) of the field of view and the detector ( 3 ).