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Tomotherapy dose distribution verification using MAGIC‐ f polymer gel dosimetry
Author(s) -
Pavoni J. F.,
Pike T. L.,
Snow J.,
DeWerd L.,
Baffa O.
Publication year - 2012
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.4704496
Subject(s) - tomotherapy , dosimetry , nuclear medicine , imaging phantom , radiation treatment planning , materials science , dose profile , percentage depth dose curve , radiation therapy , biomedical engineering , physics , medicine , ionization chamber , radiology , ion , quantum mechanics , ionization
Purpose: This paper presents the application of MAGIC‐ f gel in a three‐dimensional dose distribution measurement and its ability to accurately measure the dose distribution from a tomotherapy unit.Methods: A prostate intensity‐modulated radiation therapy (IMRT) irradiation was simulated in the gel phantom and the treatment was delivered by a TomoTherapy equipment. Dose distribution was evaluated by the R2 distribution measured in magnetic resonance imaging.Results: A high similarity was found by overlapping of isodoses of the dose distribution measured with the gel and expected by the treatment planning system (TPS). Another analysis was done by comparing the relative absorbed dose profiles in the measured and in the expected dose distributions extracted along indicated lines of the volume and the results were also in agreement. The gamma index analysis was also applied to the data and a high pass rate was achieved (88.4% for analysis using 3%/3 mm and of 96.5% using 4%/4 mm). The real three‐dimensional analysis compared the dose‐volume histograms measured for the planning volumes and expected by the treatment planning, being the results also in good agreement by the overlapping of the curves.Conclusions: These results show that MAGIC‐ f gel is a promise for tridimensional dose distribution measurements.