A modified dose calculation formalism for electronic brachytherapy sources

Brachytherapy
Larry A DeWerdSamantha J Simiele

Abstract

To propose a modification of the current dose calculation formalism introduced in the Task Group No. 43 Report (TG-43) to accommodate an air-kerma rate standard for electronic brachytherapy sources as an alternative to an air-kerma strength standard. Electronic brachytherapy sources are miniature x-ray tubes emitting low energies with high-dose-rates. The National Institute of Standards and Technology (NIST) has introduced a new primary air-kerma rate standard for one of these sources, in contrast to air-kerma strength. A modification of the TG-43 protocol for calculation of dose-rate distributions around electronic brachytherapy sources including sources in an applicator is presented. It cannot be assumed that the perturbations from sources in an applicator are negligible, and thus, the applicator is incorporated in the formalism. The modified protocol mimics the fundamental methodology of the original TG-43 formalism, but now incorporates the new NIST-traceable source strength metric of air-kerma rate at 50 cm and introduces a new subscript, i, to denote the presence of an applicator used in treatment delivery. Applications of electronic brachytherapy sources for surface brachytherapy are not addressed in this Technical Note ...Continue Reading

Citations

May 21, 2020·Medical Physics·Blake R SmithWesley S Culberson
Jun 12, 2019·Journal of Applied Clinical Medical Physics·Sergio Lozares-CorderoVíctor González-Pérez
Feb 15, 2017·Radiation Oncology·Frank W Hensley
Aug 15, 2018·Journal of Applied Clinical Medical Physics·Elijah MartinBrian Wang
Nov 3, 2020·Physics in Medicine and Biology·David Santiago Ayala AlvarezJan Seuntjens
Oct 20, 2021·Physics in Medicine and Biology·David Santiago Ayala AlvarezJan Seuntjens

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