Low contrast detectability (LCD) is a metric of fundamental importance in computed tomography (CT) imaging. In spite of this, its measurement is challenging in the context of nonlinear data processing. We introduce a new framework for objectively characterizing LCD with a single scan of a special‐purpose phantom and automated analysis software. The output of the analysis software is a “machine LCD” metric which is more representative of LCD than contrast‐noise ratio (CNR). It is not intended to replace human observer or model observer studies.

中文翻译：

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快速测量 CT 扫描仪的低对比度可检测性


低对比度可检测性 (LCD) 是计算机断层扫描 (CT) 成像中非常重要的一项指标。尽管如此，它的测量在非线性数据处理的背景下仍然具有挑战性。我们引入了一个新的框架，通过专用模型和自动分析软件的单次扫描来客观地表征 LCD。分析软件的输出是“机器 LCD”指标，它比对比度噪声比 (CNR) 更能代表 LCD。它无意取代人类观察者或模型观察者研究。