International Journal of Medical Physics, Clinical Engineering and Radiation Oncology

Volume 11, Issue 1 (February 2022)

ISSN Print: 2168-5436   ISSN Online: 2168-5444

Google-based Impact Factor: 0.65  Citations  

Computational and Experimental Approaches for Evaluating Dose under a Block in TBI Geometry

HTML  XML Download Download as PDF (Size: 453KB)  PP. 77-83  
DOI: 10.4236/ijmpcero.2022.111007    162 Downloads   687 Views  

ABSTRACT

Total Body Irradiation (TBI) patients are often treated at extended distances of several meters, with blocking made from high-Z materials placed close to the patients skin. Evaluating the dose under a block (e.g., for implanted medical device shielding purposes) in such a geometry is challenging. We compare the performance of two commonly used dose calculation algorithms, Anisotropic Analytical Algorithm (AAA) and Acuros XB, with Optically Stimulated Lumine- scence (OSLD) and ion chamber measurements in phantoms. The calculations and phantom measurements are also compared with in-vivo OSLD measure- ments. We find that OSLD and ion chamber measurements in phantom are good predictors of in-vivo measurements, while both AAA and Acuros XB sys- tematically overestimate the block transmission. We found Acuros XB to be accurate enough for a rough upper estimate (dose under block overestimated by 7% - 22%), while for AAA the overestimate was more severe (90% - 110%); the reason is that AAA does not account for the increase in pair production cro- ss-section in high-Z materials.

Share and Cite:

Russell, L. and Sillanpaa, J. (2022) Computational and Experimental Approaches for Evaluating Dose under a Block in TBI Geometry. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 11, 77-83. doi: 10.4236/ijmpcero.2022.111007.

Cited by

No relevant information.

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.