FIELD: imaging system; physics.
SUBSTANCE: system has source (310), having a focus (406), which emits a radiation beam that traverses an examination region, radiation sensitive detector array (316) having a plurality of pixels that detects radiation traversing examination region and generates projection data indicative of detected radiation. System also includes filter (314), disposed between source and examination region, that filters peripheral regions of emitted radiation, wherein filter includes two separate and moveable regions (402), each region having a substantially same thickness and constant homogeneity.
EFFECT: high image quality due to formation of projection data characterising detected radiation.
15 cl, 9 dwg
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