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In this study, the performances of stacked niobium/aluminum and molybdenum/aluminum filters were compared to that of a standard 2.5 mm aluminum filter. The molybdenum/aluminum filter had the same performance characteristics as the niobium/aluminum filter but was less expensive. The study results show that the molybdenum/aluminum filter should be a good filter choice for facilities embracing ALARA principles.

Reducing patient exposure while maintaining image quality is key to radiographers. In a comparison study of different filters, the authors found that a combined niobium/aluminum filter provides substantial reduction of entrance skin exposure with fairly small increases in tube loading and little loss of image contrast.