Seifert H, Schneider G, Kubale R, Blass G, Kramann B, Leetz H K
Institut für Radiologische Physik, Universitätskliniken des Saarlandes.
Rofo. 1996 Oct;165(4):386-91. doi: 10.1055/s-2007-1015774.
To determine and compare the minimum required radiation exposure for a.-p. abdominal radiographs with digital luminescence radiography (DLR) and a screen-film system (SFS) providing adequate image quality in clinical routine.
Abdominal radiographs a.-p. of a pig were produced with DLR and SFS systematically varying the tube current-time product. The image quality was assessed by eight experienced radiologists according to the criteria of visual resolution, mean optical density, perceptibility of the lateral edge of the psoas, the caudal edge of the liver, bone structures and intestinal wall.
The image quality of the digital radiographs was better for each criterion except visual resolution if the same current-time product was used for both techniques. From the minimum tube current-time products providing an adequate image quality it follows that a dose reduction of 57% can be achieved by applying DLR instead of speed class 200 SFS.
The recently published guide-lines for quality assurance in x-ray diagnostics issued by the German Federal Board of Physicians recommend using speed class 400 SFS. Since in that case an approximately halved radiation dose is necessary, dose reduction is hardly to be expected with DLR.
确定并比较在临床常规中，使用数字荧光成像（DLR）和屏-片系统（SFS）获得足够图像质量的前后位腹部X线片所需的最小辐射剂量。
使用DLR和SFS对猪进行前后位腹部X线摄影，系统地改变管电流-时间乘积。由八位经验丰富的放射科医生根据视觉分辨率、平均光学密度、腰大肌外侧缘、肝脏尾缘、骨骼结构和肠壁的可感知性标准对图像质量进行评估。
如果两种技术使用相同的电流-时间乘积，除视觉分辨率外，数字X线片的图像质量在每个标准上都更好。从提供足够图像质量的最小管电流-时间乘积可以得出，使用DLR而非200速级SFS可实现57%的剂量降低。
德国联邦医师委员会最近发布的X线诊断质量保证指南建议使用400速级SFS。由于在这种情况下所需辐射剂量大约减半，因此使用DLR很难实现剂量降低。
