Abstract
Purpose
To establish a method for estimating skin dose for patients with permanent breast
seed implant based on in vivo optically stimulated luminescence dosimeters (OSLDs) measurements.
Methods and Materials
Monte Carlo simulations were performed in a simple breast phantom using the EGSnrc
user code egs_brachy. Realistic models of the IsoAid Advantage Pd-103 brachytherapy
source and Landauer nanoDot OSLD were created to model in vivo skin dose measurements where an OSLD would be placed on the skin of a patient with
permanent breast seed implant following implantation. Doses to a 0.2 cm3 volume of skin beneath the OSLD and to the sensitive volume within the OSLD were
calculated, and the ratio of these values was found for various seed positions inside
the breast phantom. The maximum value of this ratio may be used as a conversion factor
that would allow skin dose to be estimated from in vivo OSLD measurements.
Results
Conversion factors of 0.5 and 1.44 are recommended for OSLDs calibrated to dose to
Al2O3 and water, respectively, at the point of measurement in the OSLD. These factors were
not significantly affected by the addition of extra seeds in the dose calculations.
Conclusions
A method for estimating skin dose from OSLD measurements was proposed. Individual
institutions should calibrate OSLDs to Pd-103 seeds to apply the results of this work
clinically.
Keywords
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Article info
Publication history
Published online: February 18, 2019
Accepted:
January 14,
2019
Received in revised form:
January 3,
2019
Received:
October 18,
2018
Footnotes
Steven Nich received funding from the Queen Elizabeth II Graduate Scholarship which is funded by the Government of Alberta. The other authors did not receive any funding for this research.
Financial disclosure: The authors report no proprietary or commercial interest in any product mentioned or concept discussed in this article.
Identification
Copyright
© 2019 American Brachytherapy Society. Published by Elsevier Inc. All rights reserved.
