5. ROC 解析(ディジタルラジオグラフィの画像評価)

抄録

The image quality in a computed radiography system (CR) was evaluated with observer performance tests using receiver operating characteristic (ROC) analysis. The detectability of low-contrast object (2mmφ beads) was compared CR with screen-film system. Effects of incident exposure to the imaging plate (IP) and image processing (contrast enhancement, unsharp masking) on the detectability of low-contrast object were also studied. The results indicated that the detectability of low-contrast object in a CR system was comparable to that of the medium-speed screen-film system. However, the detectability of low-contrast object in a CR system depended on IP size and decreased with incident exposure decreasing and increased by using contrast enhancement or unsharp masking.