Radiation mask for two dimensional ct detector

摘要

A radiation detector ( 30 ) for a computed tomography scanner ( 12 ) includes a plurality of radiation detector modules ( 32 ). Each detector module ( 32 ) includes an anti-scatter module, at least one radiation absorbing mask ( 120 ) and a detector subassembly module ( 100 ). The anti-scatter module ( 32 ) includes radiation absorbing anti-scatter plates ( 80 ). The detector sub-assembly module ( 100 ) includes a substrate ( 102 ) and an array ( 104 ) of detector elements. The radiation absorbing mask ( 120 ) is a photoetched grid, formed of a radiation absorbing material and is positioned between the anti-scatter module ( 78 ) and the detector elements of array ( 104 ). The strip of the grid, that is parallel to the anti-scatter plates ( 80 ), is wider than each anti-scatter plate ( 80 ). The detector module ( 32 ) is aligned with a spatial focus ( 74 ) by inserting the alignment pins ( 160 ) into the alignment openings ( 128 ) of the radiation absorbing mask ( 120 ) and the alignment openings ( 162 ) of the detector subassembly module ( 100 ).