Evaluation of Gama Analysis Results Significance Within Verification of Radiation IMRT Plans in Radiotherapy

Abstract

The Gamma analysis is a method, which currently represents a standard for results verification of patient IMRT (Intensity modulated Radiation Therapy) plans. It is just a numerical concept, which within standard usage contains neither relevant clinical information nor geometrical parameters of a given area. The main aim of the paper is an application development, which would be able to assess and predict of the Gamma analysis significance from the portal dosimetry on the base of the information from the planning system about irradiated volume and critical organs from the BEV (Beam’s Eye View) projection. Consequently, a frequency of unsatisfactory results in matrixes of Gamma indexes will be tracked (Gamma index is greater than 1). The last part of the analysis deals with an investigation of a geometrical coherence of these points coordinates with particular pairs of laminations of multilevel collimator and their position against BEV projection.