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J Cancer Res Ther. 2019 Jul-Sep;15(3):475-479. doi: 10.4103/jcrt.JCRT_203_18.

Optimization of low-energy electron beam production for superficial cancer treatments by Monte Carlo code.

Author information

1
Department of Medical Radiation, Faculty of Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
2
Institute of Modern Physics, Fudan University; Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE), Fudan University, Shanghai, China.
3
Radiation Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran.

Abstract

Context:

Low energy electron beam has been being used widely for superficial cancer treatments. In the current study a design for production of very low energy electron beam, by different thickness of Perspex spoilers, is presented that may be used for skin cancer.

Aims:

MCNPX Monte Carlo code was used for modeling and simulations in the current study. An energy spoiler Perspex was modeled for degrading 4 MeV electron beam of Varian 2300 CD Linac.

Materials and Methods:

The thicknesses of 3, 7, and 10 mm were applied before electron applicator at a distance of 42 cm from phantom surface. Dosimetric properties of new electron beams including Rp, Dmax, E0, as well as the penumbra of the beam were investigated.

Results:

For the 3 mm spoiler, the superficial beam output decreased to 77%, and the Dmax, R90, R50, and RP were shifted to the depths of 4, 6, 9, and 12 mm, respectively. While for 10 mm filter the results were 5.2, 3.0 and 5.0 mm for R90, R50, and Rp, respectively. In addition, the surface dose was 93% and the Dmax was shifted to the depth of 1mm for the 10mm Perspex spoiler slab.

Conclusions:

The presented beam provides a novel surface dose, Dmax, and RP which can be applicable for treatment of skin cancers with minimum dose to the beyond normal tissues.

KEYWORDS:

Electron beam; Monte Carlo; Monte Carlo N-Particle (MCNP); skin cancer; spoiler

PMID:
31169207
DOI:
10.4103/jcrt.JCRT_203_18
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