METHODS TO CALCULATE THE LENS EFFICIENCY IN OPTICALLY COUPLED CCD X-RAY-IMAGING SYSTEMS
METHODS TO CALCULATE THE LENS EFFICIENCY IN OPTICALLY COUPLED CCD X-RAY-IMAGING SYSTEMS
复制标题
DOI：
10.1118/1.597352
复制
发表时间：
1994-07-01
期刊：
影响因子：
3.8
通讯作者：
DORSI, CJ
中科院分区：
文献类型：
--
作者：
LIU, H;KARELLAS, A;DORSI, CJ
在透镜耦合CCD X射线成像中，透镜效率对于获得X射线量子噪声限制系统至关重要。然而，这个过程的方程和相关参数并不总是被正确地使用在一些文献中。这可能导致对信噪比（SNR）的不正确估计。在实践中，它被发现更方便的是使用透镜耦合效率方程，假设的消隐屏幕是一个扩展的朗伯源，因为从各种消隐屏幕出现的光子数已被测量和报告的几个研究者。本文将探讨几种最常见的透镜耦合效率方程，并解释如何正确使用它们与其他参数来计算透镜耦合CCD x射线成像系统的SNR。
In lens-coupled CCD x-ray imaging, the lens efficiency is of critical importance for attaining an x-ray quantum-noise-limited system. However, the equations and the associated parameters of this process have not always been used properly in some of the literature. This can result in the incorrect estimation of the signal-to-noise ratio (SNR). In practice, it is found more convenient to use lens-coupling efficiency equations which assume that the scintillating screen is an extended Lambertian source, since the number of light photons emerging from various scintillating screens has been measured and reported by several investigators. This communication examines several of the most common types of lens-coupling efficiency equations and explains how to use them correctly with other parameters to calculate the SNR of a lens-coupled CCD x-ray imaging system.