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Flat-Panel X-ray Detector Based on Amorphous Silicon versus Asymmetric Screen-Film System: Phantom Study of Dose Reduction and Depiction of Simulated Findings¹

¹ From the Department of Clinical Radiology, University of Muenster, Albert-Schweitzer-Strasse 33, 48129 Muenster, Germany (U.R.B., T.M.B.); Department of Biometrics and Medical Informatics, Otto-von-Guericke University, Magdeburg, Germany (F.W.R.); Department of Radiology, Wesley Medical Center, Wichita, Kan (R.C.G.); ECO, Barleben, Germany (H.S.); and Institute for Diagnostic and Interventional Radiology, University of Essen, Germany (U.W.K.). From the 2000 RSNA scientific assembly. Received April 20, 2001; revision requested June 8; final revision received October 28, 2002; accepted November 22. Address correspondence to U.R.B. (e-mail: bernhart@uni-muenster.de).

PURPOSE: To compare a large-area amorphous silicon flat-panel detector with an asymmetric screen-film system for the depiction of simulated patterns of interstitial lung disease, nodules, and catheters, as well as for evaluation of dose reduction.

MATERIALS AND METHODS: Ground-glass, linear, miliary, and reticular patterns; nodules; and catheters were superimposed over an anthropomorphic chest phantom. Hard copies were generated at different dose levels (speeds: 400, 800, and 1,600) with a flat-panel detector and were compared with copies generated with an asymmetric screen-film system (speed, 400). Detection performance of eight radiologists was compared with a receiver operating characteristic analysis of 19,200 observations per pattern. A difference was significant with a P value of .05.

RESULTS: There was no statistically significant difference between the flat-panel detector and the asymmetric screen-film system at the same speed (P > .05) and between the flat-panel detector at a speed of 800 and the asymmetric screen-film system at a speed of 400 (P > .05). The visibility of linear, miliary, and reticular patterns over lucent lung and of nodules smaller than 10 mm and catheters over obscured chest regions on copies generated at a speed of 1,600 with the flat-panel detector decreased, compared with the visibility of these features on copies generated with the asymmetric screen-film system (P < .05).

CONCLUSION: The diagnostic performance of the flat-panel detector is comparable to that of the asymmetric screen-film system for depiction of all simulated patterns of interstitial lung diseases, nodules, and catheters at the same speed and offers the potential of dose reduction to a speed of 800.

© RSNA, 2003

Index terms: Flat panel detector • Phantoms • Radiography, digital • Screens and films

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