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High‐resolution digital x‐ray detector utilizing a discrete array of CdWO 4 scintillators and a self‐scanned photodiode array
Author(s) -
Fritz Steven L.,
Cook Larry T.
Publication year - 1987
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596077
Subject(s) - optics , scintillator , photodiode , detector , detective quantum efficiency , x ray detector , physics , pinhole (optics) , image resolution , materials science , image quality , artificial intelligence , computer science , image (mathematics)
A high‐resolution x‐ray detector array for x‐ray imaging is described. It consists of a discrete array of CdWO 4 scintillators and a Reticon 1024S photodiode array with a fiber‐optic faceplate. The scintillator elements measure 0.099×3×4 mm and are bonded together with aluminum foil separators to minimize light crossover. Detective quantum efficiency (DQE) of individual detector channels was 0.38. Systematic variations between channels were substantial. With only a simple correction for between channel variations, DQE for the entire array was 0.04. Evaluation of the edge response function of the array showed that resolution is similar to a detector whose line spread function is Gaussian with a standard deviation of 0.172 mm.