Ruppenthal T, Doll G, Sergl H G, Fricke B
Orthod Fr. 1991;62 Pt 3:1033-42.
By introduction of rare earth film-screen combinations instead of classical screens dose reduction has already been possible. By this study the extent of dose reduction without loss of clinical information was to be examined by comparing conventional radiographic rare earth film-screen combinations to digital radiography. Statistical analysis proves for conventional lateral cephalograms that soft tissue reference points can better be localized if small radiation doses are used. The localization of reference points in areas of less radiographic transparency is better when applying higher doses. These results were not found in images by digital radiographic technique. Reference points both of soft tissue and of more dense areas of the skull were equally to be localized independent from radiation dose by the linear sensibility characteristics of digital radiography. This enables reduction of radiation doses and therefore a contribution to radioprotection.
通过引入稀土增感屏组合而非传统增感屏，已经可以实现剂量降低。通过本研究，将传统的放射照相稀土增感屏组合与数字射线照相进行比较，以检验在不损失临床信息的情况下剂量降低的程度。统计分析表明，对于传统的侧位头颅X线片，使用小剂量辐射时软组织参考点能更好地定位。在射线透亮度较低的区域，应用较高剂量时参考点的定位更好。而在数字射线照相技术的图像中未发现这些结果。由于数字射线照相的线性灵敏度特性，软组织和颅骨密度较高区域的参考点均可独立于辐射剂量进行定位。这使得能够降低辐射剂量，从而有助于辐射防护。
