Image quality evaluation of a direct digital radiography detector operating in a UK radiology department

Stephen M. Kengyelics; Arnold R. Cowen; Andrew G. Davies

doi:10.1117/12.349494

28 May 1999 Image quality evaluation of a direct digital radiography detector operating in a UK radiology department

Stephen M. Kengyelics, Arnold R. Cowen, Andrew G. Davies

Proceedings Volume 3659, Medical Imaging 1999: Physics of Medical Imaging; (1999) https://doi.org/10.1117/12.349494
Event: Medical Imaging '99, 1999, San Diego, CA, United States

Abstract

This paper presents results of an image quality evaluation performed on a prototype DirectRay system (Sterling Diagnostic Imaging, Direct Radiography Corp.) operating in a UK radiology department. Physical imaging characteristics measured included characteristic (sensitometric) response, square-wave response function, Wiener spectrum and detective quantum efficiency (DQE). In addition, subjective image quality was assessed using a calibrated threshold contrast detail detectability (TCDD) test object. Results produced by the DirectRay system were compared with those achieved by a modern photo-stimulable computed radiography (CR) system. DirectRay and CR systems exhibit similarly wide exposure dynamic ranges, but in practice exploit this property in differing ways. Measured values of DQE(0) for the DirectRay system were found to be higher compared to those obtained for CR, for the majority of the exposure range examined. These results were confirmed subjectively by TCDD test-object analysis. No evidence of a 'memory artifact' phenomenon was found.

Citation Download Citation

Stephen M. Kengyelics, Arnold R. Cowen, and Andrew G. Davies "Image quality evaluation of a direct digital radiography detector operating in a UK radiology department", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); https://doi.org/10.1117/12.349494

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