Abstract

The Electronic Portal Imaging Device (EPID) is used for patient setup during radiotherapy sessions. Dosimetric verification is done using the ion chambers, diodes and thermoluminescence detectors. In Intensity Modulated Radiation Therapy (IMRT) the dosimetry is sophisticated and time consuming task. The simultaneous use of an amorphous silicon (aSi) detectors and Transit Dosimetry (TD) option in Treatment Planning System (TPS) Eclipse, Varian enables dosimetric pre-treatment verification of the IMRT plans. The purpose of this study was to calibrate the EPID and TPS and to evaluate the usefulness of that method for dose verification in IMRT technique.

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