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Image blur in a flat-panel detector due to compton scattering at its internal mountings

: Bub, A.; Gondrom, S.; Maisl, M.; Uhlmann, N.; Arnold, W.


Measurement Science and Technology 18 (2007), Nr.5, S.1270-1277
ISSN: 0957-0233
Fraunhofer IZFP ()
Fraunhofer IIS ()
point spread function; blurring; x-ray flat-panel pixel detector; computed tomography

An image-blurring effect observable in digital x-ray flat-panel pixel detectors, used for x-ray computed tomography or radioscopy, has been studied. Our study indicates that the origin of this blurring effect is the Compton scattered radiation within the entrance window, the mounting of the detector scintillator and other parts of the detector. This effect becomes, in particular, noticeable in the presence of a sharp edge of a metallic component being tested, making the scattering in the detector asymmetric.