Nelson R S, Barbaric Z L, Gomes A S, Moler C L, Deckard M E
Med Phys. 1982 Sep-Oct;9(5):777-83. doi: 10.1118/1.595050.
A large field format imaging system which utilizes a flat fluorescent screen rather than the traditional image intensifier as the primary x-ray detector is discussed in this paper. A low light level image isocon camera is optically coupled to a rare-earth screen. An overview of the isocon camera and its return beam mode of operation is included. Theoretical limitations to this approach to real time radiographic imaging are discussed in terms of system efficiency and signal-to-noise ratio (SNR) requirements. The viability of this concept for radiographic imaging is considered with respect to the image intensifier-camera unit. The merits of employing a CsI:Na screen as the primary detector and an isocon tube with an improved SNR are presented as potential areas for further investigation.
本文讨论了一种大型现场成像系统，该系统使用平面荧光屏而非传统的图像增强器作为主要的X射线探测器。低光照水平的分流直像管相机与稀土屏进行光学耦合。文中包括了分流直像管相机及其回束操作模式的概述。从系统效率和信噪比（SNR）要求的角度讨论了这种实时射线成像方法的理论局限性。相对于图像增强器 - 相机单元，考虑了这一概念用于射线成像的可行性。提出了采用碘化铯：钠屏作为主要探测器以及具有改进信噪比的分流直像管的优点，作为进一步研究的潜在领域。
