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Dosimetric comparison of 4 MeV and 6 MeV electron beams for total skin irradiation

Cited 1 time in Web of Science Cited 5 time in Scopus
Authors
Park, So-Yeon; Ahn, Beom Seok; Park, Jong Min; Ye, Sung-Joon; Kim, Il han; Kim, Jung-in
Issue Date
2014-09-06
Publisher
BioMed Central
Citation
Radiation Oncology, 9(1):197
Keywords
Total skin electron irradiation (TSEI)Electron energyStanford TechniqueMycosis fungoides
Abstract
Background
In this study, dosimetric aspects of TSEI consisting of a 4 MeV beam with no spoiler were investigated in comparison to a nominal 6 MeV beam with spoiler, and the potential for clinical applications was evaluated.

Methods
The TSEI technique is based on the Stanford technique, which utilizes a beam configuration of six-dual fields. MOSFETs were used to measure the optimal gantry angle, profile uniformity, and absolute dose at the calibration point. The depth dose curve of the central axis was measured in the treatment plane using EBT2 film. Photon contamination was measured as the dose at 5 cm depth in a solid water phantom relative to the maximum dose using a parallel plate ion chamber. A MOSFET dosimeter placed on the surface of a humanoid phantom, and EBT2 films inserted into a humanoid phantom were used to verify the TSEI commissioning.

Results
Dosimetric aspects of the 4 MeV TSEI beam, such as profile uniformity (±10%) and relative photon contamination (<0.001%), were comparable to those of a 6 MeV TSEI beam. The relative depth dose of the 4 MeV electrons was 81.4% at the surface and 100% at 0.4 cm. For the 6 MeV electrons, the relative depth dose was 93.4% at the surface and 100% from 0.2 cm to 0.4 cm. The calculated B-factor of the 4 MeV TSEI beam was 1.55, and 1.53 for the 6 MeV TSEI. 80% of the prescribed dose was obtained at 0.22 cm depth for the 4 MeV TSEI beam and 0.53 cm for the 6 MeV TSEI beam in the humanoid phantom measurement.

Conclusions
The suggested 4 MeV beam for TSEI could be applied to shallow depth skin diseases and to electron boost as second treatment course.
Language
English
URI
http://hdl.handle.net/10371/109832
DOI
https://doi.org/10.1186/1748-717X-9-197
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College of Medicine/School of Medicine (의과대학/대학원)Radiation Oncology (방사선종양학전공)Journal Papers (저널논문_방사선종양학전공)
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