MCNPX simulation of a multileaf collimator
Related Experiment Video
Updated: Oct 8, 2025
Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
Falk Pönisch1, Uwe Titt, Stephen F Kry
1Radiation Physics, University of Texas, M.D. Anderson Cancer Center 1515 Holcombe Blvd., Unit 94, Houston, Texas 77030, USA.
Abstract:
Our purpose in this work was to validate a very detailed Monte Carlo model, developed in MCNPX, of a Millennium 120 multileaf collimator integrated into a Varian Clinac 21EX treatment head. The Monte Carlo results were compared with measurements for both the 6-MV and 18-MV photon modes. The following comparisons were performed: depth-dose curves, lateral profiles, multileaf collimator leakage, the tongue-and-grove test, and the round leaf-end test. The good agreement between the Monte Carlo simulations and measurements showed that our model is accurate. Consequently, the benchmarks provided by our study can be used in future Monte Carlo studies.
