Open AccessOptimization of skin dose using in‐vivo MOSFET dose measurements in bolus/non‐bolus fraction ratio: A VMAT and a 3 DCRT study
Author(s) -
Dias Anabela G.,
Pinto Diana F. S.,
Borges Maria F.,
Pereira Maria H.,
Santos João A. M.,
Cunha Luís T.,
Lencart Joana
Publication year - 2019
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1002/acm2.12525
Subject(s) - bolus (digestion) , imaging phantom , nuclear medicine , medicine , reproducibility , in vivo , biomedical engineering , chemistry , surgery , microbiology and biotechnology , chromatography , biology
In‐phantom and in‐vivo three dimensional conformal radiation therapy (3 DCRT ) and volumetric modulated arc therapy ( VMAT ) skin doses, measured with and without bolus in a female anthropomorphic phantom RANDO and in patients, were compared against treatment planning system calculated values. A thorough characterization of the metal oxide semiconductor field effect transistor measurement system was performed prior to the measurements in phantoms and patients. Patients with clinical indication for postoperative external radiotherapy were selected. Skin dose showed higher values with 3 DCRT technique compared with VMAT . The increase in skin dose due to the use of bolus was quantified. It was observed that, in the case of VMAT , the bolus effect on the skin dose was considerable when compared with 3 DCRT . From the point of view of treatment time, bolus cost, and positioning reproducibility, the use of bolus in these situations can be optimized.