Volumetric Modulated Arc Therapy (VMAT): A modern radiotherapy technique - A single institutional experience | [Pakistan Journal of Medical Sciences • 2021]

Author(s):

1. Azhar Rashid: Department of Radiation Oncology (Stereotactic Radiosurgery), Neurospinal and Cancer Care Institute (NCCI), 100/1, Depot Lines Mansfield Street, M.A. Jinnah Road, Saddar, Karachi, Pakistan.

2. Zaeem Ahmad: Department of Radiation Oncology (Stereotactic Radiosurgery), Neurospinal & Cancer Care Institute (NCCI), M.A Jinnah Road, Saddar,Karachi, Pakistan

3. Muhammad Ali Memon: Department of Radiation Oncology (Stereotactic Radiosurgery), Neurospinal & Cancer Care Institute (NCCI), M.A Jinnah Road, Saddar,Karachi, Pakistan

4. Abdul Sattar M Hashim: Department of Radiation Oncology (Stereotactic Radiosurgery), Neurospinal & Cancer Care Institute (NCCI), M.A Jinnah Road, Saddar,Karachi, Pakistan

Abstract:

Objective: To evaluate VMAT plans for conformity and homogeneity of radiation dose to the target in order to share our experience as a pioneering institute to use VMAT technology in Pakistan. Methods: Since December 2014 to January 2018, 530 patients of various anatomical sites were treated by VMAT technique at Neurospinal Cancer Care Institute (NCCI) Karachi Pakistan. ERGO++ planning system (Version 1.7.2) was used to develop VMAT plans with single or multiple arcs by the rotation of couch and gantry. The plans were evaluated by calculating Conformity Index (CI) and Homogeneity Index (HI) and critical organ (OARs) doses of individual tumor sites. Results: The average CI of various sites was 1.4 (range: 1.0-2.0) and average HI of various sites was 1.20 (range: 1.07-1.374), respective critical organ doses were adequately achieved. Conclusions: VMAT treatment planning technique showed good conformal and homogeneous target coverage with sparing of organs at risk and reduced treatment delivery time. With these features, safety of VMAT technique may allow its routine clinical use, though it is still under investigation in many areas.

Page(s): 355-361

DOI: DOI not available

Published: Journal: Pakistan Journal of Medical Sciences, Volume: 37, Issue: 2, Year: 2021

Keywords:

Radiotherapy , Conformity Index , VMAT , Homogeneity Index

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