Seifert H, Jesberger H J, Schneider G, Rein L, Blass G, Limbach H G, Niewald M, Sitzmann F C, Kramann B
Department of Radiotherapy, University Hospital of Saarland, Homburg/Saar, Germany.
Acta Radiol. 1998 Sep;39(5):514-9. doi: 10.1080/02841859809172217.
To determine the minimum acceptable radiation dose for an adequate image quality in thorax a.p. radiographs of neonates using mobile X-ray equipment.
The influence of additional filtration (1.0 mm Al + 0.1 mm Cu) on image quality and radiation dose was determined for the speed class 400 screen-film system (SFS) and digital luminescence radiography (DLR) by making radiographs of a test phantom. Conventional and digital thorax a.p. radiographs of a rabbit were produced using various tube current-time products. The quality of the rabbit radiographs was judged by eight radiologists applying image quality criteria according to the German guidelines and the recommendations of the European Community.
The added filter resulted in a dose reduction of 39% at 66 kV. DLR gave a further dose reduction of 25% in comparison to the speed class 400 SFS while maintaining adequate image quality, i.e. the radiographs were clinically acceptable with regard to quality criteria.
The radiation dose resulting from thorax a.p. radiographs of neonates can be reduced by approximately 50% with the use of additional filtration and DLR.
确定使用移动X射线设备进行新生儿胸部前后位X线摄影时，获得足够图像质量所需的最低可接受辐射剂量。
通过对测试体模进行X线摄影，确定了附加滤过（1.0mm铝+0.1mm铜）对400速度级增感屏-胶片系统（SFS）和数字荧光X线摄影（DLR）的图像质量和辐射剂量的影响。使用不同的管电流-时间乘积对一只兔子进行传统和数字胸部前后位X线摄影。八位放射科医生根据德国指南和欧洲共同体的建议，应用图像质量标准对兔子的X线照片质量进行评判。
在66kV时，附加滤过使剂量降低了39%。与400速度级SFS相比，DLR在保持足够图像质量的同时，剂量进一步降低了25%，即X线照片在质量标准方面临床上是可接受的。
使用附加滤过和DLR可使新生儿胸部前后位X线摄影产生的辐射剂量降低约50%。
