McParland B J
Department of Medical Imaging, King Fahad National Guard Hospital, Riyadh, Saudi Arabia.
Br J Radiol. 1998 Dec;71(852):1288-95. doi: 10.1259/bjr.71.852.10319003.
Patient skin doses resulting from interventional radiological procedures have the potential to exceed threshold doses for deterministic effects such as erythema and epilation. If the irradiation geometry is known, the entrance skin dose can be estimated from the measured dose-area product. For each of 10 non-coronary interventional procedures, a nominal geometry was identified. From a previous survey of patient dose-area products, the entrance skin doses were estimated under the assumption that all procedures were performed with the nominal geometry specific to it. An analysis of the uncertainties in these doses caused by realistic deviations from the nominal geometry was also performed and it was shown that the estimated entrance skin dose values are at least to within 40%, and generally to within about 30%, of those actually received. For example, the median estimated entrance skin doses for the posteroanterior and lateral projections of cerebral angiography were 100 and 110 mGy. respectively, and for hepatic angiography 425 mGy. The largest entrance skin dose estimate for a single projection was for the angiography component of a CT arterial portography procedure at 670 mGy. Comparisons between entrance skin dose estimates obtained from this study are made with data from other interventional radiology patient dose surveys.
介入放射学程序导致的患者皮肤剂量有可能超过诸如红斑和脱毛等确定性效应的阈值剂量。如果照射几何条件已知，则可以根据测量的剂量面积乘积估算入射皮肤剂量。对于10种非冠状动脉介入程序中的每一种，都确定了一个标称几何条件。根据先前对患者剂量面积乘积的调查，在假设所有程序均以特定于其的标称几何条件进行的情况下估算入射皮肤剂量。还对由与标称几何条件的实际偏差引起的这些剂量的不确定性进行了分析，结果表明，估算的入射皮肤剂量值至少在实际接受剂量值的40%以内，通常在约30%以内。例如，脑血管造影前后位和侧位投影的估算入射皮肤剂量中位数分别为100和110 mGy，肝血管造影为425 mGy。单次投影的最大入射皮肤剂量估算是CT动脉门静脉造影程序的血管造影部分，为670 mGy。将本研究获得的入射皮肤剂量估算值与其他介入放射学患者剂量调查的数据进行了比较。
