直接放射成像放大：三种微焦点X射线管的评估
Direct radiographic magnification: evaluation of three microfocus x-ray tubes.
作者信息
De Smet A A, Fritz S L, Templeton A W
出版信息
AJR Am J Roentgenol. 1982 Jan;138(1):139-42. doi: 10.2214/ajr.138.1.139.
Three microfocus x-ray tubes (RSI, Siemens, and Eimac) were evaluated for their focal and imaging characteristics. The RSI and Siemens focal spots had similar homogeneous radiation intensity distributions. The Eimac tube had an asymmetric intensity distribution. Because of their focal spot characteristics, the RSI and Siemens tubes provided superior magnification radiographs for small objects. The Siemens and Eimac tubes were preferable for magnification of thick objects because their larger object-film air gap reduced scattered radiation reaching the film.
对三个微焦点X射线管（RSI、西门子和Eimac）的焦点和成像特性进行了评估。RSI和西门子的焦点具有相似的均匀辐射强度分布。Eimac管的强度分布不对称。由于其焦点特性，RSI和西门子管为小物体提供了更好的放大射线照片。西门子和Eimac管更适合对厚物体进行放大，因为它们较大的物-片空气间隙减少了到达胶片的散射辐射。
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