Sorenson J A
J Nucl Med. 1976 Feb;17(02):137-41.
Three different methods of correcting for Anger camera deadtime loss were investigated. These included analytic methods (mathematical modeling), the marker-source method, and a new method based on counting "pileup" events appearing in a pulse-height analyzer window positioned above the photopeak of interest. The studies were done with 99mTc on a Searle Radiographics camera with a measured deadtime of about 6 musec. Analytic methods were found to be unreliable because of unpredictable changes in deadtime with changes in radiation scattering conditions. Both the marker-source method and the pileup-counting method were found to be accurate to within a few percent for true counting rates of up to about 200 K cps, with the pileup-counting method giving better results. This finding applied to sources at depths ranging up to 10 cm of presdwood. The relative merits of the two methods are discussed.
研究了三种校正Anger相机死时间损失的不同方法。这些方法包括分析方法（数学建模）、标记源方法以及一种基于对位于感兴趣光峰上方的脉冲高度分析仪窗口中出现的“堆积”事件进行计数的新方法。研究使用99mTc在一台Searle Radiographics相机上进行，测得的死时间约为6微秒。由于死时间会随着辐射散射条件的变化而发生不可预测的改变，因此分析方法被发现不可靠。对于高达约200 K cps的真实计数率，标记源方法和堆积计数方法的准确度均在几个百分点以内，其中堆积计数方法的结果更好。这一发现适用于深度达10 cm的预压木材中的源。讨论了这两种方法的相对优点。
