Iranian Journal of Medical Physics

Iranian Journal of Medical Physics

Solution for Processing Pelvic Bone Metastases with Halcyon TM 2.0 on Lateral and Longitudinal Isocenters Treatment Plans Using the VMAT Technique: A Comparative Study

Document Type : Original Paper

Authors
Morad Erraoudi 1
Kaoutar El Bouchiti 2
Yassine Herrassi 3
mohamed El ghalmi 4
Yassir Raoui 5
Youssef Bouzekraoui 6
FARIDA BENTAYEB 7
Lalla Btissam Drissi 8
1 Department of physics, Faculty of sciences, University Mohammed V in Rabat, Morocco
2 Mohammed VI University of Health Sciences, Casablanca, Morocco
3 Iba Dosimetry Schwarzenbruck, Germany
4 Faculty of Sciences, LPHE-M&S, Mohammed V University, Rabat
5 Université Mohammed V de Rabat
6 Hassan First University of Settat, High Institute of Health Sciences, Laboratory of Sciences and Health Technologies, Settat, Morocco
7 Departement of Physics, Laboratory of High Energy Physics, Modelling and Simulation, Faculty of Science, Mohammed V Agdal University, Rabat, Kingdom of Morocco
8 1Department of physics, Faculty of sciences, University Mohammed V in Rabat, Morocco
10.22038/ijmp.2023.70105.2234
Abstract
Introduction: Treatment of pelvic bone metastases using a Halcyon machine, mostly presents some difficulties to plan, especially for big volumes because of the machine field size. The purpose of this study is to use two lateral isocenters in the treatment of pelvic bone metastases with the Halcyon machine, in order to overcome its limitations in treating large volumes.
Material and Methods: We report a retrospective study of 8 patients who received radiotherapy for pelvic bone metastases, all treated by two different VMAT techniques. The first technique was performed by two longitudinal isocenters (LONI) and the second by two lateral isocenters (LATI) respecting the authorized distance longitudinally between two isocenters which must be less than 8 cm. For each isocenter, two opposite arcs are used for all treated patients.
Results: The plans conformity index (CI) assessment shows no difference between the two used techniques for all the treated patients. Remarkable coverage of PTVs was obtained in lateral isocenter (LATI) with 96.2% compared to 94%.6% for LONI, as well as the maximum dose which was 109.4% for LATI versus 112.3% for LONI. However, the Conformation number (CN) that takes into account both healthy tissue and organ at risk protection was improved by 7.3% by using LATI.
Conclusion: A very satisfactory result has been obtained in the treatment of pelvic bone metastases with LATI. With this technique, we can exceed the limits of the Halcyon machine and process larger volumes.
Keywords
VMAT
Pelvic
Radiotherapy
PTV
Halcyon Machine
Subjects
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Iranian Journal of Medical Physics
Volume 21, Issue 4 - Serial Number 4
July and August 2024
Pages 228-236

  • Receive Date 25 January 2023
  • Revise Date 05 July 2023
  • Accept Date 12 July 2023