Marshall N W, Faulkner K
Regional Medical Physics Department, Newcastle General Hospital, Newcastle-Upon-Tyne, UK.
Br J Radiol. 1992 Jan;65(769):44-9. doi: 10.1259/0007-1285-65-769-44.
The measurement and prediction of scattered radiation dose to staff in diagnostic radiology is particularly important, owing to the increased use and complexity of interventional radiology. The air kerma-area product and scattered radiation dose in the vicinity of the patient couch, for both overcouch and undercouch X-ray tube geometries, were simultaneously monitored. The scattered radiation distribution at the couchside was deduced at a range of tube potentials for both overcouch and undercouch X-ray tube geometries. The variation of scattered radiation with field size on both geometries was investigated, as well as the variation with focus-table distance on an overcouch tube geometry. It was discovered that the scattered radiation dose at a point correlated with the air kerma-area product and the result may be used for radiation protection purposes. A method of predicting the scattered radiation dose at a given position is described.
由于介入放射学的使用增加和复杂性提高，测量和预测诊断放射学中工作人员所受的散射辐射剂量尤为重要。对于床头和床底X射线管几何结构，同时监测了患者检查床附近的空气比释动能面积乘积和散射辐射剂量。推导了床头和床底X射线管几何结构在一系列管电压下检查床边的散射辐射分布。研究了两种几何结构下散射辐射随射野大小的变化，以及床头管几何结构下散射辐射随焦点-台面距离的变化。发现某一点的散射辐射剂量与空气比释动能面积乘积相关，该结果可用于辐射防护目的。描述了一种预测给定位置散射辐射剂量的方法。
