Mean glandular dose coefficients (D(g)N) for x-ray spectra used in contemporary breast imaging systems

Physics in Medicine and Biology
Anita NosratiehJ M Boone

Abstract

To develop tables of normalized glandular dose coefficients D(g)N for a range of anode-filter combinations and tube voltages used in contemporary breast imaging systems. Previously published mono-energetic D(g)N values were used with various spectra to mathematically compute D(g)N coefficients. The tungsten anode spectra from TASMICS were used; molybdenum and rhodium anode-spectra were generated using MCNPX Monte Carlo code. The spectra were filtered with various thicknesses of Al, Rh, Mo or Cu. An initial half value layer (HVL) calculation was made using the anode and filter material. A range of the HVL values was produced with the addition of small thicknesses of polymethyl methacrylate (PMMA) as a surrogate for the breast compression paddle, to produce a range of HVL values at each tube voltage. Using a spectral weighting method, D(g)N coefficients for the generated spectra were calculated for breast glandular densities of 0%, 12.5%, 25%, 37.5%, 50% and 100% for a range of compressed breast thicknesses from 3 to 8 cm. Eleven tables of normalized glandular dose (D(g)N) coefficients were produced for the following anode/filter combinations: W + 50 μm Ag, W + 500 μm Al, W + 700 μm Al, W + 200 μm Cu, W + 300 μm Cu, W + 50 μm Rh,...Continue Reading

References

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Citations

May 14, 2017·Medical Physics·Antonio SarnoIoannis Sechopoulos
Apr 9, 2019·Physics in Medicine and Biology·Josilene C SantosPaulo R Costa
Sep 13, 2016·Physics in Medicine and Biology·David R Dance, Ioannis Sechopoulos
Oct 30, 2020·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Sae ShinoharaYoshiharu Higashida
Apr 16, 2021·Physics in Medicine and Biology·Rodrigo T MasseraAlessandra Tomal

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