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Experimental Studies |
1 From the Departments of Diagnostic Radiology (T.M.B., D.O., G.R., K.L., S.S., U.R.B.) and Biometrics and Medical Informatics (S.K.), Otto-von-Guericke University, Leipziger Str 44, 39120 Magdeburg, Germany. From the 1997 RSNA scientific assembly. Received December 30, 1997; revision requested March 28, 1998; final revision received January 28, 1999; accepted April 14. Address reprint requests to T.M.B. (e-mail: Thomas .Bernhardt@medizin.uni-magdeburg.de).
PURPOSE: To evaluate the diagnostic performance of storage phosphor and digital selenium radiography (DSR) with asymmetric and symmetric screen-film systems at different speeds in the detection of simulated interstitial lung disease and catheters.
MATERIALS AND METHODS: Patterns of simulated interstitial lung disease and catheters were superimposed over an anthropomorphic chest phantom. Hard-copy images were generated at DSR (200-, 400-, and 600-speed), storage phosphor radiography (200- and 400-speed), and asymmetric (400-speed) and symmetric (200- and 400-speed) screen-film imaging. Surface doses were measured, and receiver operating characteristic analyses were performed.
RESULTS: No statistically significant differences were found between the detector systems with the same speeds for each interstitial pattern. Significantly poorer results were found at 600-speed DSR than at 200-speed DSR. Detection of catheters and nodules over high-attenuation areas was significantly worse with the symmetric screen-film system than with the other detectors. The surface dose with the DSR system, without a grid, was about 50% less than that of the other detector systems, with grids, at the same speed.
CONCLUSION: No significant difference was found in the diagnostic performance at DSR, storage phosphor radiography, and film-based radiography for simulated interstitial lung disease at corresponding speeds; there was a reduction in the surface dose of about 50% with the 400-speed DSR system.
Index terms: Lung, radiography, 60.11, 60.1215, 60.917 • Phantoms • Radiography, comparative studies, 60.11, 60.1215 • Radiography, digital, 60.1215 • Radiography, selenium detector • Radiography, storage phosphor • Receiver operating characteristic (ROC) curve
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