Repository logo
 
No Thumbnail Available
Publication

Assesing multileaf collimator effect on the build-up region using Monte Carlo method

Use this identifier to reference this record.

Advisor(s)

Abstract(s)

Previous Monte Carlo studies have investigated the multileaf collimator (MLC) contribution to the build-up region for fields in which the MLC leaves were fully blocking the openings defined by the collimation jaws. In the present work, we investigate the same effect but for symmetric and asymmetric MLC defined field sizes (2×2, 4×4, 10×10 and 3×7 cm2). A Varian 2100C/D accelerator with 120-leaf MLC is accurately modeled fora6MVphoton beam using the BEAMnrc/EGSnrc code. Our results indicate that particles scattered from accelerator head and MLC are responsible for the increase of about 7% on the surface dose when comparing 2×2 and 10×10 cm2 fields. We found that the MLC contribution to the total build-up dose is about 2% for the 2×2 cm2 field and less than 1% for the largest fields.

Description

Keywords

Physics Surface dose Build-up dose MLC IMRT Monte Carlo

Citation

Zarza-Moreno M, Teixeira N, Jesus AP, Mora G. Assesing multileaf collimator effect on the build-up region using Monte Carlo method. Pol J Med Phys Eng. 2008;14(3):163-82.

Research Projects

Organizational Units

Journal Issue

Publisher

Collections

CC License