灰度
成像体模
图像质量
人工智能
观察员(物理)
计算机视觉
计算机科学
计算机断层摄影术
医学影像学
窗口(计算)
质量(理念)
图像(数学)
核医学
医学
放射科
物理
量子力学
操作系统
作者
Frédéric Noo,Katrin Hahn,H. Christian Davidson,Ulrich Rassner,Marta E. Heilbrun
摘要
Radiation dose associated with CT scans has become an important concern in medical imaging. Fortunately, there are many pathways to reducing dose. A complicated aspect, however, is to ensure that image quality is not affected while reducing the dose. A preferred method to assess image quality is ROC analysis, possibly with a search process. For early assessment of new imaging solutions, utilization of human observers and real patient data is rarely practical. Instead, studies involving phantoms and model observers are often preferred. We present here an experimental result that sheds light on how the grayscale window affects human observer performance in a typical phantom-based study; and we also present an analysis that clarifies how the grayscale window affects the statistics of the image. These studies provide a better understanding of possible consequences associated with not including a grayscale window in studies with model observers, as is typical.
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