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. Author manuscript; available in PMC: 2014 Aug 28.

Published in final edited form as: Phys Med Biol. 2011 Sep 9;56(19):6359–6378. doi: 10.1088/0031-9155/56/19/013

SdNR as a function of filter thickness at 49 kVp with two different filter materials. The filter thicknesses are indicated in value layers with half-value layer (hvl), quarter-value layer (qvl), twentieth-value layer (tvl), and fiftieth-value (fvl) at tomosynthesis projection dose (a). The spectra corresponding to the optimal (fvl) thicknesses of Sn and Cu filtration, the lower-right corner of (a) diagram (b), and those corresponding to the sub-optimal (fvl) thicknesses of Sn and Cu filtration, the upper-left corner of (a) diagram (c).

SdNR as a function of filter thickness at 49 kVp with two different filter materials. The filter thicknesses are indicated in value layers with half-value layer (hvl), quarter-value layer (qvl), twentieth-value layer (tvl), and fiftieth-value (fvl) at tomosynthesis projection dose (a). The spectra corresponding to the optimal (fvl) thicknesses of Sn and Cu filtration, the lower-right corner of (a) diagram (b), and those corresponding to the sub-optimal (fvl) thicknesses of Sn and Cu filtration, the upper-left corner of (a) diagram (c).