Abstract
The limited dynamic range of conventional film radiography (FR) tends to impair contrast examinations of the gastrointestinal system. Storage phosphor digital imaging offers a much wider dynamic range than film/screen but has a lower spatial resolution and an approximately 40% lower quantum detection than film/screen. We compared detection performance of paired iso-dose spot films of 90 anatomic regions (45 with and 45 without lesions) obtained with digital storage phosphor radiography (system resolution 0.2mm, 10bits) and conventional film radiography (OG film, Lanex regular screens) in 75 patients undergoing air contrast barium examinations of the esophagus (12), stomach (30), small bowel (14) and colon (19). The gastrointestinal lesions included inflammatory lesions (n=25), neoplasms (n=14), and other lesions (n=6). The SR were presented in three modes: a default mode approximating conventional image characteristics (SRd), and two edge enhanced modes for high frequencies (enhancement factor 3, centered at 1.0 cycles/mm) of which one was grey scale reversed (SRe and SRg, respectively).
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