Lecomber A R, Faulkner K
Regional Medical Physics Department, Newcastle General Hospital, Newcastle upon Tyne, UK.
Br J Radiol. 1993 Nov;66(791):1035-41. doi: 10.1259/0007-1285-66-791-1035.
A dental radiography unit operating at 70 kV (nominal) and 20 cm focus-skin distance was used to irradiate an anthropomorphic phantom loaded with lithium fluoride thermoluminescent dosemeters, in order to assess the variation in organ absorbed dose with intraoral periapical radiographic view. 14 views using the bisecting-angle technique and four views using the paralleling technique were studied. The results are presented and the doses and dose distributions examined. Doses for the paralleling and bisecting-angle techniques are compared, and the effects of focus-skin distance and beam collimation upon patient dosimetry discussed. Sources of uncertainty in dental dosimetry studies using phantoms are also considered.
使用一台工作在70 kV（标称）和20 cm焦点-皮肤距离的牙科X射线摄影设备，对装载有氟化锂热释光剂量计的人体模型进行照射，以评估口腔根尖周X线片不同投照角度下器官吸收剂量的变化。研究了采用平分角技术的14个投照角度以及采用平行技术的4个投照角度。给出了结果，并对剂量和剂量分布进行了检查。比较了平行技术和平分角技术的剂量，并讨论了焦点-皮肤距离和线束准直对患者剂量测定的影响。还考虑了使用人体模型进行牙科剂量测定研究中不确定性的来源。
