Seifert H, Kubale R, Hagen T, Kramann B, Leetz H K
Institute of Radiological Physics, University Hospital of Saarland, Saar, Germany.
Br J Radiol. 1996 Apr;69(820):311-7. doi: 10.1259/0007-1285-69-820-311.
For lateral skull radiography the minimum required radiation patient exposure to ensure adequate image quality was determined for digital luminescence radiography (DLR) in comparison with a screen-film system (speed class 200). Radiographs were produced with a grid technique on conventional X-ray equipment. A real prepared female head including a true fracture above the pars petrosa ossis temporalis was imaged. The tube current-time product (mAs), and thus the surface entrance dose, was varied systematically. Surface entrance dose was measured with TLD-100 rods. Image quality was judged by experienced radiologists according to the criteria: visual resolution, mean optical density, contrast and perceptibility of specific bone structures. Surface entrance dose was reduced from 0.46 to 0.20 mGy by application of DLR instead of speed class 200 screen-film system without loss of diagnostic information in clinical routine. This corresponds to a dose reduction potential of 57% showing a good agreement with the dose reduction potential of 52% obtained in a previous study using the Alderson head phantom.
对于头颅侧位X线摄影，测定了数字荧光X线摄影（DLR）与屏-片系统（速度等级200）相比确保足够图像质量所需的最低患者辐射暴露量。在传统X线设备上采用滤线栅技术制作X线片。对一个包含颞骨岩部上方真实骨折的真实准备好的女性头部进行成像。管电流-时间乘积（mAs）以及表面入射剂量进行系统变化。用TLD-100棒测量表面入射剂量。由经验丰富的放射科医生根据以下标准判断图像质量：视觉分辨率、平均光学密度、对比度以及特定骨结构的可感知性。在临床常规中，应用DLR而非速度等级200的屏-片系统时，表面入射剂量从0.46 mGy降至0.20 mGy，且不损失诊断信息。这相当于剂量降低潜力为57%，与先前使用Alderson头部模型的研究中获得的52%的剂量降低潜力显示出良好的一致性。
