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Comparison of low contrast detectability between a digital amorphous silicon and a screen‐film based imaging system for thoracic radiography
Author(s) -
Aufrichtig Richard
Publication year - 1999
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 - 10.1118/1.598630
Subject(s) - detective quantum efficiency , optical transfer function , detector , optics , digital radiography , computed radiography , contrast (vision) , radiography , observer (physics) , physics , amorphous silicon , image resolution , materials science , image quality , computer vision , computer science , silicon , optoelectronics , quantum mechanics , crystalline silicon , nuclear physics , image (mathematics)
Low contrast threshold detectability is investigated theoretically and experimentally for an amorphous silicon ( a ‐ Si ) x‐ray detector designed for digital radiography and for a standard thoracic screen‐film combination. A theoretical signal‐to‐noise ratio is described with a human observer signal detection model. It is calculated using the detective quantum efficiency (DQE) and the modulation transfer function of the imaging system, as well as a spatial response function for the human visual system. Using a four‐alternative forced choice observer perception study, the threshold contrasts of disk shaped objects ranging in size from 0.3 to 4.0 mm are determined. Significantly better contrast detectability is obtained from the digital detector, which is attributed to its higher DQE. On average, the disk shaped objects can be detected at 45% less contrast than required for screen‐film. With no free parameters the experimental data agree well with those predicted by the observer model. Based upon the data, the model predicts that x‐ray exposure for the a ‐ Si detector only needs to be 30% of the exposure required to perform equally well on the contrast‐detail detectability task using screen‐film.