低エネルギー領域に K 吸収端をもつフィルタの評価 : ニオブフィルタの有用性

概要

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We studied a reduction in patient dose using niobium, yttrium and molybdenum filters with K-absorption edge in low X-ray energy. Patient dose, effective X-ray energy, relative X-ray intensity and subject contrast were measured in the case of with and without filters. As results, patient dose can be decreased by 20〜40% with filters in comparison to without filters at 50〜80kV tube voltage. However, this is the same case with an aluminum filter as well. Effective X-ray energy was increased in 2〜7keV by filtration at 40〜80kV tube voltage and also relative X-ray intensity was decreased by 40〜70% at 50〜80kV tube voltage. Radiographic contrast dropped a little compared to that of without filter. However there was no problem in the reading of the radiograph. Results show niobium, yttrium and molybdenum filters are not completely superior to aluminum filter.
公益社団法人日本放射線技術学会の論文
1994-06-01