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Measurement and effects of MOSKIN detectors on skin dose during high energy radiotherapy treatment

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Abstract

During in vivo dosimetry for megavoltage X-ray beams, detectors such as diodes, Thermo luminescent dosimeters (TLD’s) and MOSFET devices are placed on the patient’s skin. This of course will affect the skin dose delivered during that fraction of the treatment. Whilst the overall impact on increasing skin dose would be minimal, little has been quantified concerning the level of increase in absorbed dose, in vivo dosimeters produce when placed in the beams path. To this extent, measurements have been made and analysis performed on dose changes caused by MOSKIN, MOSFET, skin dose detectors. Maximum increases in skin dose were measured as 15 % for 6 MV X-rays and 10 % for 10 MV X-rays at the active crystal of the MOSKIN device which is the thickest part of the detector. This is compared to 32 and 26 % for a standard 1 mm thick LiF TLD at 10 × 10 cm2 field size for 6 and 10 MV X-rays respectively. Radiochromic film, EBT2 has been shown to provide a high resolution 2 dimensional map of skin dose from these detectors and measures the effects of in vivo dosimeters used for radiotherapy dose assessment.

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Acknowledgments

This study has been supported by a grant from the Research Grants Council of HKSAR, China (Project No. CityU 123810). Hani Alnawaf has been supported by the Saudi Arabian Government.

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Authors and Affiliations

  1. Centre for Medical Radiation Physics, Illawarra Health and Medical Research Institute, University of Wollongong, Northfields Ave, Gwynneville, NSW, Australia

    Hani Alnawaf & Martin Butson

  2. Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong

    Martin Butson & Peter K. N. Yu

Authors
  1. Hani Alnawaf
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  2. Martin Butson
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  3. Peter K. N. Yu
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Correspondence to Martin Butson.

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Alnawaf, H., Butson, M. & Yu, P.K.N. Measurement and effects of MOSKIN detectors on skin dose during high energy radiotherapy treatment. Australas Phys Eng Sci Med 35, 321–328 (2012). https://doi.org/10.1007/s13246-012-0153-1

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  • DOI: https://doi.org/10.1007/s13246-012-0153-1

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