Sutton D, Cranley K
Department of Medical Physics, Ninewells Hospital & Medical School, Dundee, UK.
Br J Radiol. 1996 Mar;69(819):249-55. doi: 10.1259/0007-1285-69-819-249.
It is important to be able to assign priorities to the purchase of radiological equipment. The ability to incorporate potential dose savings into a ranking procedure involving costs is therefore of interest. In this paper we have considered the question of the dose saving made available by the selection of low attenuation table tops and have described how to generate a factor which can be used in a ranking procedure such as cost effectiveness analysis. We describe how data on the expected dose saving can be obtained from measurements of the aluminium equivalent thickness in air used in conjunction with theoretical spectral data. The magnitude of the overestimate when in air measurements alone are used is presented, as is a ready reckoner for determining the true dose saving when changes in table top are considered. Unless the table to be replaced is of some age, the expected dose saving will vary between 6% and 1%.
能够为放射设备的采购确定优先级很重要。因此，将潜在的剂量节省纳入涉及成本的排序程序的能力备受关注。在本文中，我们考虑了选择低衰减桌面所带来的剂量节省问题，并描述了如何生成一个可用于成本效益分析等排序程序的因子。我们描述了如何通过结合理论光谱数据测量空气中的铝等效厚度来获取预期剂量节省的数据。给出了仅使用空气中测量值时高估的幅度，以及在考虑桌面变化时确定实际剂量节省的速算方法。除非要更换的桌面使用了一段时间，否则预期剂量节省将在6%至1%之间变化。
