Gur D, Good W F, Oliver J H, Thaete F L, Baron R L, Federle M P, Campbell W L, Rosenthal M S
Department of Radiology, University of Pittsburgh, PA 15261-0001.
Radiology. 1994 Apr;191(1):119-22. doi: 10.1148/radiology.191.1.8134556.
To evaluate radiologists' ability to detect abdominal masses during sequential viewing of series of computed tomographic (CT) scans at varying rates.
Receiver operating characteristic (ROC) analysis was used to assess the ability of five experienced radiologists to determine the presence or absence of subtle abdominal masses in 29 cases (15 positive, 14 negative) while viewing CT scans sequentially at different rates (0.5, 1, 2, 4, 7, and 21 images per second) and also at reader-selectable rates.
Even at extremely fast viewing rates (21 images per second), radiologists performed significantly better (P < .05) than would be expected by chance alone (average area Az under the ROC curve = 0.73 vs 0.5). As the viewing rate decreased, their performance increased. The reader-selectable mode was better than any fixed-rate cine mode (average Az = 0.93).
Fixed-rate sequential viewing of CT images for the primary diagnosis of subtle abdominal masses should be restricted to no more than one or two images per second, but the reader-selectable viewing mode is preferable to any fixed-rate cine mode.
评估放射科医生在以不同速率连续查看计算机断层扫描（CT）系列图像时检测腹部肿块的能力。
采用接受者操作特征（ROC）分析，评估5名经验丰富的放射科医生在以不同速率（每秒0.5、1、2、4、7和21幅图像）以及读者可选速率连续查看CT扫描时，判断29例病例（15例阳性，14例阴性）中是否存在细微腹部肿块的能力。
即使在极快的查看速率（每秒21幅图像）下，放射科医生的表现也显著优于仅靠随机猜测的预期表现（ROC曲线下平均面积Az = 0.73对0.5）。随着查看速率降低，他们的表现有所提高。读者可选模式优于任何固定速率的电影模式（平均Az = 0.93）。
对于细微腹部肿块的初步诊断，CT图像的固定速率连续查看应限制在每秒不超过一或两幅图像，但读者可选查看模式优于任何固定速率的电影模式。
