Patent ID: 7027561

Claim:
A dual-energy scanning-based radiation detecting apparatus comprising: a line detector; a device for scanning said line detector across an object to be examined while said line detector is exposed to an ionizing radiation beam, which has impinged on said object, to thereby record a plurality of line images of said object; a filter device arranged in the path of said ionizing radiation beam upstream of said object to filtrate said ionizing radiation beam, the filter device being capable of operating in two operation modes having different filter characteristics; and a control device for altering operation mode of the filter device subsequent to at least every second of said line images being recorded, wherein said device for scanning said line detector across said object is adapted to scan said line detector in stepwise movements and said line detector is adapted to be exposed and read out when being still between each of said stepwise movements to thereby record said plurality of line images of said object; and said control device is adapted to alter the operation mode of said filter device once while said line detector is still between each of said stepwise movements at each to each one of said line images being recorded and said line detector is adapted, when being still between each of said stepwise movements, to be exposed and read out once before and once after said operation mode alteration performed while said line detector is still.