Abstract：
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.
journal_name
Med Physjournal_title
Medical physicsauthors
Pavoni JF,Pike TL,Snow J,DeWerd L,Baffa Odoi
10.1118/1.4704496subject
Has Abstractpub_date
2012-05-01 00:00:00pages
2877-84issue
5eissn
0094-2405issn
2473-4209journal_volume
39pub_type
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