Evaluation of two-dimensional dose distributions for pre-treatment patient-specific IMRT dosimetry

Abstract

The accuracy of dose calculation is crucial for success of the radiotherapy treatment. One of the methods that represent the current standard for patient-specific dosimetry is the evaluation of dose distributions measured with an ionization chamber array inside a homogeneous phantom using gamma method. Nevertheless, this method does not replicate the realistic conditions present when a patient is undergoing therapy. Therefore, to more accurately evaluate the treatment planning system (TPS) capabilities, gamma passing rates were examined for beams of different complexity passing through inhomogeneous phantoms.

Keywords

• imrt
• 2d dose verification
• gamma method
• anthropomorphic phantom