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Detection of Monitoring Materials on Bedside Chest Radiographs with the Most Recent Generation of Storage Phosphor Plates: Dose Increase Does Not Improve Detection Performance¹

¹ From the Department of Radiology and Ludwig Boltzmann-Institute for Clinical and Experimental Radiologic Research, University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria. Received February 6, 2002; revision requested April 15; revision received June 17; accepted August 8. Address correspondence to E.E. (e-mail: edith.eisenhuber@univie.ac.at).

PURPOSE: To evaluate the performance of the most recent generation of storage phosphor plates for the detection of low-contrast catheter material on bedside chest radiographs.

MATERIALS AND METHODS: In 10 patients in the intensive care unit, bedside chest radiographs were obtained with a 400-speed conventional screen-film system and with storage phosphor plates with exposure levels comparable to a 200-, 400-, or 800-speed conventional system. The chest radiograph was divided into 20 regions, 60% of which were superimposed with low-contrast catheter fragments. Six observers independently assessed the presence of catheter fragments by using a receiver operating characteristic (ROC) methodology.

RESULTS: Detection performance (mean area under the ROC curve [A_z]) with the storage phosphor plates was significantly superior to that with the screen-film system (A_z = 0.76) at all three dose levels (A_z = 0.88, 0.87, and 0.83 for 200-, 400-, and 800-speed doses, respectively; P < .05). Increasing the dose to a 200-speed system did not significantly increase detection performance compared with that with the 400-speed digital radiographs (A_z = 0.88 vs 0.87). Dose reduction to 800 speed significantly deteriorated the detection performance (A_z = 0.83) compared with that with the 400- and 200-speed digital radiographs, respectively.

CONCLUSION: The most recent generation of storage phosphor plates is superior to a 400-speed screen-film system for the detection of catheter material, even at an exposure level of 800 speed.

© RSNA, 2003

Index terms: Radiography, bedside, 68.11 • Radiography, comparative studies, 68.11, 68.1215 • Radiography, storage phosphor, 68.1215 • Receiver operating characteristic (ROC) curve • Thorax, radiography, 68.11, 68.1215

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