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Digital radiography with photostimulable storage phosphors. Control of detector latitude in chest imaging
1Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710.
Rationale And Objectives:
A widely used digital radiography system based on a photostimulable storage phosphor (PSP) detector was analyzed with regard to radiographic contrast changes that result from the adjustment of detector latitude (x-ray sensitivity range) in the normal processing of chest images.
Methods:
Images of an acrylic step wedge were acquired using the digital system in a mode that permitted direct control of effective detector latitude. The images were post-processed in conditions duplicating those used for portable chest examinations, and contrast was measured.
Results:
Increases in effective detector latitude provided only marginal radiographic contrast gains in the subdiaphragm-equivalent areas of the laser-printed digital film image, while causing large reductions in radiographic contrast in the lung-equivalent region.
Conclusion:
Detector latitude is an important variable that should be monitored or controlled in investigations that compare reader performance using conventional and digital systems.