Photon beam dose distributions for patients with implanted temporary tissue expanders

This study examines the effects of temporary tissue expanders (TTEs) on the dose distributions of photon beams in breast cancer radiotherapy treatments. EBT2 radiochromic film and ion chamber measurements were taken to quantify the attenuation and backscatter effects of the inhomogeneity. Results il...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-01, Vol.573 (1), p.12062-4
Main Authors: Asena, A, Kairn, T, Crowe, S B, Trapp, J V
Format: Article
Language:English
Subjects:
Attenuation
Backscattering
Breast
Breast cancer
Cancer
Downstream effects
Elastomers
Expanders
Implants
Inhomogeneity
Ion beams
Ionization chambers
Patients
Photon beams
Photons
Physics
Radiation therapy
Reduction
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Summary:This study examines the effects of temporary tissue expanders (TTEs) on the dose distributions of photon beams in breast cancer radiotherapy treatments. EBT2 radiochromic film and ion chamber measurements were taken to quantify the attenuation and backscatter effects of the inhomogeneity. Results illustrate that the internal magnetic port present in a tissue expander causes a dose reduction of approximately 25% in photon tangent fields immediately downstream of the implant. It was also shown that the silicone elastomer shell of the tissue expander reduced the dose to the target volume by as much as 8%. This work demonstrates the importance for an accurately modelled high-density implant in the treatment planning system for post-mastectomy breast cancer patients.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/573/1/012062