Holdsworth D W, Gerson R K, Fenster A
Imaging Research Laboratories, John P. Robarts Research Institute, London, Ontario, Canada.
Med Phys. 1990 Sep-Oct;17(5):876-86. doi: 10.1118/1.596578.
We have developed a low-noise digital camera based on a 512 x 96 element CCD operating in the time-delay integration mode. This camera has been combined with an x-ray image intensifier to record radiographic images produced by a scanning slot beam of radiation. This results in the rejection of a large fraction of scattered radiation, without a significant increase in x-ray tube heat loading or image acquisition time. Here we describe the design of our CCD camera and the results of our investigations of camera resolution, linearity, noise, and quantum efficiency. We have found that both the resolution limit (50 mm-1) and the dynamic range (2100) of this novel camera are greater than reported values for conventional video cameras. Applications of this system in digital angiography and mammography are discussed.
我们开发了一种基于512×96像素电荷耦合器件（CCD）的低噪声数码相机，该相机工作在延时积分模式。此相机已与X射线图像增强器相结合，用于记录由扫描缝隙辐射束产生的射线图像。这使得大部分散射辐射被滤除，而不会显著增加X射线管的热负荷或图像采集时间。在此，我们描述了我们的CCD相机的设计以及对相机分辨率、线性度、噪声和量子效率的研究结果。我们发现，这款新型相机的分辨率极限（50 lp/mm）和动态范围（2100）均高于传统摄像机的报道值。文中还讨论了该系统在数字血管造影和乳腺摄影中的应用。
