Journal
HEALTH PHYSICS
Volume 87, Issue 5, Pages 507-511Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.HP.0000133364.55155.09
Keywords
photons; Monte Carlo; dosimetry; internal; pregnancy
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Funding
- NLM NIH HHS [1R03 LM007964-01] Funding Source: Medline
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Specific absorbed fractions are essential for calculation of radiation dose from internal emitters. Existing specific absorbed fractions for pregnant women were calculated using the stylized models; in this work, a partial-body tomographic model for a pregnant woman was constructed from a rare set of CT images. Based on this tomographic model, the Monte Carlo code, EGS4-VLSI, was used to derive specific absorbed fractions. Monoenergetic, isotropic photon emitters from 15 keV to 4 MeV were distributed in different source organs, and doses were calculated to many target regions in the body. Even though the results showed general agreement with previous studies for higher energies, significant differences were also found, especially for lower energies. The main reasons for the differences are due to the variation of mass, geometry, and organ distances, and they demonstrate the influence of more realistic body models on dose calculations.
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