Journal of Medical Physics
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Year : 2010  |  Volume : 35  |  Issue : 1  |  Page : 23-32

Monte Carlo simulation of a multi-leaf collimator design for telecobalt machine using BEAMnrc code

1 International Cancer Center, Mahatma Gandhi Memorial Medical Trust Hospital, Bhimavaram, AP-534 204, India
2 Yashoda Hospital, Secunderabad, India

Correspondence Address:
Komanduri M Ayyangar
Mahatma Gandhi Memorial Medical Trust Hospital, Peda Amiram, Bhimavaram, AP-534 204
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-6203.58780

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This investigation aims to design a practical multi-leaf collimator (MLC) system for the cobalt teletherapy machine and check its radiation properties using the Monte Carlo (MC) method. The cobalt machine was modeled using the BEAMnrc Omega-Beam MC system, which could be freely downloaded from the website of the National Research Council (NRC), Canada. Comparison with standard depth dose data tables and the theoretically modeled beam showed good agreement within 2%. An MLC design with low melting point alloy (LMPA) was tested for leakage properties of leaves. The LMPA leaves with a width of 7 mm and height of 6 cm, with tongue and groove of size 2 mm wide by 4 cm height, produced only 4% extra leakage compared to 10 cm height tungsten leaves. With finite 60 Co source size, the interleaf leakage was insignificant. This analysis helped to design a prototype MLC as an accessory mount on a cobalt machine. The complete details of the simulation process and analysis of results are discussed.

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