Detectability of simulated pulmonary nodules on chest radiographs: Comparison between irradiation side sampling indirect flat-panel detector and computed radiography

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• 作者：Yuki Yano ; Hidetake Yabuuchi ; Nobukazu Tanaka ; Junji Morishita ; Tsutomu Akasaka ; Yoshio Matsuo ; Shunya Sunami ; Takeshi Kamitani ; Mikako Jinnouchi ; Yuzo Yamasaki ; Michinobu Nagao ; Masayuki Sasaki
• 关键词：Radiographic image enhancement ; Solitary pulmonary nodule ; Phantoms ; Imaging ; Diagnostic performance ; ROC curve
• 刊名：European Journal of Radiology
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：82
• 期：11
• 页码：2050-2054
• 全文大小：826 K

文摘

Objective

To compare the detectability of simulated pulmonary nodules on chest radiographs between an irradiation side sampling indirect flat-panel detector (ISS-FPD) and computed radiography (CR).

Materials and methods

This study was an observer performance study. Simulated pulmonary nodules of 8 mm in diameter were superimposed on an anthropomorphic chest phantom. Chest radiographs were acquired under 2 exposure levels (4 and 3.2 mAs) with the ISS-FPD and the CR. Six thoracic radiologists evaluated all 40 images (10 patterns ¡Á 2 different exposure doses ¡Á 2 different systems) for the presence or absence of a lesion over each of 12 defined areas on a 3-megapixel monochrome liquid-crystal display. Receiver operating characteristic (ROC) curves were obtained for observation in predefined 480 areas. A jackknife method was used for statistical analysis. Differences with a P value of <0.05 were considered significant.

Results

The analysis of the observer detection of simulated pulmonary nodules showed larger areas under the ROC curve (AUC) by the ISS-FPD than by the CR. There was a statistically significant difference between the two systems at 3.2 mAs (P = 0.0330).

Conclusion

The ISS-FPD was superior to the CR for the detection of simulated pulmonary nodules at 3.2 mAs.