Optimization of skin dose using in-vivo MOSFET dose measurements in bolus/non-bolus fraction ratio: A VMAT and a 3DCRT study.
In-phantom and in-vivo three dimensional conformal radiation therapy (3DCRT) 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 3DCRT 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 3DCRT. From the point of view of treatment time, bolus cost, and positioning reproducibility, the use of bolus in these situations can be optimized.
['Dias|Anabela G|AG|', 'Pinto|Diana F S|DFS|', 'Borges|Maria F|MF|', 'Pereira|Maria H|MH|', 'Santos|João A M|JAM|', 'Cunha|Luís T|LT|', 'Lencart|Joana|J|']
D001943:Breast Neoplasms D005260:Female D006801:Humans D058958:Organs at Risk D019047:Phantoms, Imaging D011379:Prognosis D011874:Radiometry D011879:Radiotherapy Dosage D011880:Radiotherapy Planning, Computer-Assisted D020266:Radiotherapy, Conformal D050397:Radiotherapy, Intensity-Modulated D012666:Semiconductors D012867:Skin
skin dose MOSFETs bolus breast carcinoma in-vivo dosimetry