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Evaluation of a Treatment Planning System for Applying the Effect of Titanium Clips on Isodosedistribution in Radiation Therapy of Colorectal Cancer



Karimi R1 ; Jabbari K1 ; Hosseini A2 ; Amouheidari A3 ; Aslani M1
Authors
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Authors Affiliations
  1. 1. Department of Medical Physics and Engineering, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Department of General Surgery, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Department of Radiation-Oncology, Isfahan Milad Hospital, Isfahan, Iran

Source: Journal of Isfahan Medical School Published:2017

Abstract

Background: In laparoscopy of colorectal tumors, titanium clips are used to close the surgery site. For post-operation treatment with radiation, the clips might change the dose distribution. In this study, the effect of titanium clips in isodose distribution of 6- and 18-MV photons was evaluated. Methods: Laparoscopy clips were placed on a phantom with material close to soft tissue. Computed tomography (CT) scan images of this phantom were imported in planning software and the percentage depth dose (PDD) and profiles of the dose were obtained for 6- and 18-MV photons. Findings: Calculated PDD showed weakening and backscattering of the dose of radiation in the path after the clips. Dose changes for the regions after the clips had a maximum of 1.7% and 1.1% for 6- and 8-MV photons, respectively. The amount of backscattering was up to 0.4% and 0.7% for 6- and 18-MV photons, respectively. Conclusion: Presence of the titanium clips in the path of radiation changes the depth dose and profiles. The changes for of a single clip are minor. However, for few clips beside each other, the effect of radiation attenuation is not negligible. © 2017, Isfahan University of Medical Sciences(IUMS). All rights reserved.
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