The measured calibration curves suggest that, at least for the two beams taken into account (6 MV linac and TomoTherapy), a single calibration can be successfully adopted for each film lot. Films were digitized using an Epson 10000XL scanner and FilmQA™ Pro software was employed for the analysis. At TomoTherapy dose maps were obtained for a clinical plan in three different coronal planes. In a second stage, films were exposed to full clinical plans at linac (step and shoot IMRT and VMAT).
A series of irradiations with simple fields (uniform dose distributions on regular shaped targets) was performed. Gafchromic® EBT3 films were irradiated both at linac and TomoTherapy and calibration curves were obtained.
To compare the multichannel approach with the single channel dosimetry. The method we propose combines the experience gained in our center with the guidelines of the protocol proposed by Lewis et al. To evaluate EBT3 for pre-treatment patient specific quality assurance (QA).
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