A research system for digital radiography is described, which is based on a selenium detector with capacitive probe readout. The detector, in which a selenium drum is used as the primary image receptor, is exposed by a scanning fan beam. Scatter reduction and primary transmission by slot-radiography as well as the imaging properties of the selenium detector are discussed. The spatial resolution and the noise behaviour of the detector are analysed. The signal-to-noise ratios expressed in terms of noise equivalent quanta and detective quantum efficiency are calculated and compared with competitive systems.
"A Selenium-Based Detector System For Digital Slot-Radiography", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); doi: 10.1117/12.968639; https://doi.org/10.1117/12.968639