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Medical Physics |
1 From the Department of Radiology, University of California, Davis, Medical Center, 4701 X St, Radiology Research Laboratories, Sacramento, CA 95817. Received August 26, 1998; revision requested October 23; final revision received January 14, 1999; accepted March 26. Supported in part by grants from the United States Army Breast Cancer Research Program (DAMD17-94-J-4424 and DAMD17-98-1-8176), the California Breast Cancer Research Program (0192), and the National Cancer Institute (R21 CA 82077). Address reprint requests to the author (e-mail: jmboone@ucdavis.edu).
PURPOSE: To extend the utility of normalized glandular dose (DgN) calculations to higher x-ray energies (up to 120 keV) and to provide the tools for investigators to calculate DgN values for arbitrary mammographic and x-ray spectra.
MATERIALS AND METHODS: Validated Monte Carlo methods were used to assess DgN values. One million x-ray photons (1–120 keV, in 1-keV increments) were input to a semicircular breast geometry of thicknesses from 2 to 12 cm and breast compositions from 0% to 100% glandular. DgN values for monoenergetic (1–120 keV) x-ray beams, polyenergetic (40–120 kV, tungsten anode) x-ray spectra, and polyenergetic mammographic spectra were computed. Skin thicknesses of 4–5 mm were used.
RESULTS: The calculated DgN values were in agreement within approximately 1%–6% with previously published data, depending on breast composition. DgN tables were constructed for a variety of x-ray tube anode-filter combinations, including molybdenum anode–molybdenum filter, molybdenum anode–rhodium filter, rhodium anode–rhodium filter, tungsten anode–rhodium filter, tungsten anode–palladium filter, and tungsten anode–silver filter. DgN values also were graphed for monoenergetic beams to 120 keV and for general diagnostic x-ray beams to 120 kV.
CONCLUSION: The tables and graphs may be useful for optimizing mammographic procedures. The higher energy data may be useful for investigations of the potential of dual-energy mammography or for calculation of dose in general diagnostic or computed tomographic procedures.
Index terms: Breast radiography, radiation dose, 00.47, 0.99 • Breast radiography, technology, 00.12 • Breast radiography, utilization, 00.99 • Physics
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