Solution for Processing Pelvic Bone Metastases with Halcyon TM ۲.۰ on Lateral and Longitudinal Isocenters Treatment Plans Using the VMAT Technique: A Comparative Study

Publish Year: 1403
نوع سند: مقاله ژورنالی
زبان: English
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JR_IJMP-21-4_004

تاریخ نمایه سازی: 13 آبان 1403

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 ۸ 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 ۸ 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 ۹۶.۲% compared to ۹۴%.۶% for LONI, as well as the maximum dose which was ۱۰۹.۴% for LATI versus ۱۱۲.۳% for LONI. However, the Conformation number (CN) that takes into account both healthy tissue and organ at risk protection was improved by ۷.۳% 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.

Authors

Morad Erraoudi

Department of physics, Faculty of sciences, University Mohammed V in Rabat, Morocco

Kaoutar El Bouchiti

Mohammed VI University of Health Sciences, Casablanca, Morocco

Yassine Herrassi

Iba Dosimetry Schwarzenbruck, Germany

mohamed El ghalmi

Faculty of Sciences, LPHE-M&S, Mohammed V University, Rabat

Yassir Raoui

Université Mohammed V de Rabat

Youssef Bouzekraoui

Hassan First University of Settat, High Institute of Health Sciences, Laboratory of Sciences and Health Technologies, Settat, Morocco

FARIDA BENTAYEB

Departement of Physics, Laboratory of High Energy Physics, Modelling and Simulation, Faculty of Science, Mohammed V Agdal University, Rabat, Kingdom of Morocco

Lalla Btissam Drissi

۱Department of physics, Faculty of sciences, University Mohammed V in Rabat, Morocco

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