Author(s):
1. Dražan Jaroš, Centar za radioterapiju, Republic of Srpska, Bosnia and Herzegovina
2. Bojan Pavičar, Affidea, Internacionalni medicinski centar, Centar za Radioterapiju, Dvanaest beba bb, Banja Luka, Pr, Republic of Srpska, Bosnia and Herzegovina

Abstract:
Aim of this study is to investigate if the collimator rotation has an influence on the dose distribution in volumetric arc therapy (VMAT) for head and neck cancer. The computed tomography (CT) scans of 10 patients were included in the study. VMAT plans, with two full arcs, were generated with two different approaches: first approach was to use collimator rotation of 30 and 330 degrees, and second approach was to use collimator rotation of 0 and 90 degrees. All plans were analyzed using dose volume histograms. Conformity index (CI) and heterogeneity index (HI) were calculated. Results for planning target volume (PTV) coverage and sparing organs at risk were similar for both approaches.

Key words:
Head and neck cancer radiotherapy,collimator angle.

Date of abstract submission:
25.08.2026.

Conference:
Contemporary Materials 2026 - Savremeni Materijali

Applied paper from author