Langen H J, Klein H M, Wein B, Schiwy-Bochat K H, Stargardt A, Günther R W
Department of Diagnostic Radiology, University of Technology, Aachen, Germany.
Invest Radiol. 1993 Mar;28(3):231-4. doi: 10.1097/00004424-199303000-00010.
The effect of varying exposure parameters on the detectability of a fracture with digital and conventional radiography were examined.
A macerated fractured skull was imaged by film-screen radiography (FSR) and digital storage phosphor radiography (DR) with various exposure values. Five radiologists traced the course of a fracture line. The length of the fracture was reported and the results were analyzed by Student's t test for paired samples.
At 35% of the conventional radiation dose, the standard DR screen displayed an average of 48% of the fracture length. The difference from the conventional image (45%) was not significant in this case. An increase of the dose to ten times the conventional dose (250 mAs) yielded no significant improvement in the detectability of the length of the fracture (51%).
This experiment shows that with use of the DR with the standard screen, a dose reduction of approximately 35% appears to be possible without any resulting loss of image quality compared to FSR. Use of the high resolution screens should be avoided, since they require a higher incident image dose than standard screens without offering any diagnostic advantages. The image dose of digital radiographs can be roughly estimated based on the digital device sensitivity value. As a rule, the sensitivity value should range between 100 and 200.
研究不同曝光参数对数字X线摄影和传统X线摄影检测骨折的影响。
用不同曝光值对一具浸泡脱脂的骨折颅骨进行屏-片摄影（FSR）和数字存储磷光体X线摄影（DR）成像。5名放射科医生描绘骨折线的走行。报告骨折长度，并采用配对样本t检验分析结果。
在传统辐射剂量的35%时，标准DR屏显示的骨折长度平均为48%。在这种情况下，与传统图像（45%）的差异不显著。将剂量增加到传统剂量的10倍（250mAs），骨折长度的可检测性没有显著改善（51%）。
本实验表明，与FSR相比，使用标准屏的DR时，剂量降低约35%似乎是可行的，且不会导致图像质量下降。应避免使用高分辨率屏，因为它们比标准屏需要更高的入射图像剂量，且无任何诊断优势。数字X线摄影的图像剂量可根据数字设备灵敏度值大致估算。通常，灵敏度值应在100至200之间。
