Relationship Between Target Delineation and Surface Dose in Breast Radiotherapy Using Helical Tomotherapy


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Arslan S. A. , Inan G. A. , Aral I. P. , Celik S., Karabuga H., Ozturk H. F.

UHOD-ULUSLARARASI HEMATOLOJI-ONKOLOJI DERGISI, vol.28, no.4, pp.201-207, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 4
  • Publication Date: 2018
  • Doi Number: 10.4999/uhod.182607
  • Title of Journal : UHOD-ULUSLARARASI HEMATOLOJI-ONKOLOJI DERGISI
  • Page Numbers: pp.201-207

Abstract

To investigate the effect of different planning target volumes (PTVs) and the breathing motion on the surface dose with Helical Tomotherapy (HT). Irradiations with different target volumes (PTV-3, PTV0, PTV+5) using a male randophantom placed on a dynamic platform were performed and measured with MOSFET. The irradiation of the phantom on the dynamic platform revealed that at least 75%, 91% and 104% of the predicted surface dose obtained for PTV-3, PTV 0 and PTV+5, respectively. Statistically significant difference was observed between static and dynamic measurements for PTV-3 (p= 0.02). Surface dose was decreased with increased breathing frequency and amplitude for PTV 0 without statistical significance. HT enables an effective surface dose in chest wall radiotherapy irrespective of the respiratory movement. The delineation is an important aspect of superficial moving targets such as chest wall in treatment with HT. The effect of breathing motion on surface dose is observed most obviously on cropped PTVs.