Wagner L K, Cohen G
J Comput Assist Tomogr. 1982 Apr;6(2):378-82. doi: 10.1097/00004728-198204000-00024.
The energy dependence of contrast-detail-dose (CdD) and object-detectability-dose (OdD) curves for computed tomographic scanners is investigated. The effects of changes in beam energy on perceptibility are shown to be due to changes in signal-to-noise ratio resulting from changes in contrast and photon statistics. Energy-dependence analysis of OdD curves is shown to depend on the atomic composition of the phantom used to generate the curves, while such an analysis of CdD curves is independent of the atomic composition of the phantom. It is also shown that any OdD curve can be generated from CdD curves and that use of this fact rectifies any potential energy-dependent interpretation of CdD curves.
研究了计算机断层扫描仪的对比度-细节剂量（CdD）和物体可探测性剂量（OdD）曲线的能量依赖性。结果表明，射线能量变化对可感知性的影响是由于对比度和光子统计变化导致的信噪比变化。OdD曲线的能量依赖性分析表明，其取决于用于生成曲线的体模的原子组成，而CdD曲线的此类分析则与体模的原子组成无关。还表明，任何OdD曲线都可以从CdD曲线生成，并且利用这一事实可以纠正对CdD曲线的任何潜在的能量依赖性解释。
