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Parametrization of mammography normalized average glandular dose tables
Author(s) -
Sobol Wlad T.,
Wu Xizeng
Publication year - 1997
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.597937
Subject(s) - parametrization (atmospheric modeling) , filter (signal processing) , mammography , mathematics , digital mammography , nuclear medicine , computer science , physics , optics , breast cancer , medicine , computer vision , radiative transfer , cancer
Data from existing tables of normalized glandular doses in mammography were parametrized to determine analytical expressions that match tabulated results within known uncertainties. The parametrization was performed for three different target/filter combinations (molybdenum target–molybdenum filter, molybdenum target–rhodium filter, and rhodium target–rhodium filter) and three different breast compositions (100% adipose, 50% adipose–50% glandular, and 100% glandular). The analytical expressions provide the normalized glandular dose for any breast composition within stated ranges of tabulated input parameters (kVp, half‐value layer, and breast thickness). The maximum difference between tabulated and parametrized data is 1.29%, which is smaller than the stated 2% uncertainty in tabulated dose data due to uncertainties in the x‐ray spectra models used to generate the tables. Analytical expressions are easily coded to create custom functions that return the normalized glandular dose for the set of input parameters. Examples of implementation are presented in Microsoft Visual Basic for Applications™ (VBA).