Evaluation of mechanical and geometric accuracy of two different image guidance systems in radiotherapy

To assess the mechanical and the geometric accuracy of two different clinically used image guidance systems in radiotherapy for a period of 6 months. With the image guidance procedures being routine in the clinical radiotherapy department, the quality assurance tests for these systems become essenti...

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Bibliographic Details
Published in:Reports of practical oncology and radiotherapy Vol. 21; no. 3; pp. 259 - 265
Main Authors: Kanakavelu, Nithya, Ravindran, Anand Mambakam, Samuel, Emmanvelrajan James Jebaseelan
Format: Journal Article
Language:English
Published: Netherlands Elsevier Urban & Partner Sp. z o.o 01.05.2016
Elsevier
Subjects:
Hematology, Oncology and Palliative Medicine
Image guidance
Mechanical and geometric accuracy
Original
Quality assurance
Radiology
Image guidance
Mechanical and geometric accuracy
Quality assurance
ISSN:1507-1367, 2083-4640
Online Access:Get full text
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Summary:To assess the mechanical and the geometric accuracy of two different clinically used image guidance systems in radiotherapy for a period of 6 months. With the image guidance procedures being routine in the clinical radiotherapy department, the quality assurance tests for these systems become essential. The mechanical and geometric accuracy of these systems are crucial since it directly affects patient treatment set-up and delivery. We have assessed the mechanical and the geometric accuracy of two different image guidance systems (MV and kV based), being used clinically for a period of 6 months. The quality assurance tests such as imager positioning/repositioning, imaging and treatment beam isocentre coincidence, imager mechanical alignment, image scaling, geometric accuracy of cone beam computed tomography system, automatic image registration and offset calculation accuracy were assessed in this period. It was found that both systems were mechanically and geometrically accurate within ±2mm in this period. The quality assurance tests for MV based image guidance system were simple compared to kV based systems. We recommend performing periodic quality assurance tests to verify the integrity of both image guidance systems.
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Address: Department of Radiation Oncology, SevenHills Hospital, Mumbai, India. Tel.: +91 9769569110.
Address: Photonics, Nuclear and Medical Physics Division, VIT University, Vellore 632 014, India. Tel.: +91 0416 2202125.
Present address: Photonics, Nuclear and Medical Physics Division, VIT University, Vellore 632 014, India. Tel.: +91 9618015142.
ISSN:1507-1367
2083-4640
DOI:10.1016/j.rpor.2015.11.005