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Radiological Physics and Technology
Published in: Radiological Physics and Technology 4/2019

01-12-2019 | Lung Cancer

Technical note: improved positioning protocol for patient setup accuracy in conventional radiotherapy for lung cancer

Authors: Hongbo Chai, Yuichiro Narita, Masafumi Takagi, Mikiko Kudo, Tomomi Kimura, Keiichi Kattou

Published in: Radiological Physics and Technology | Issue 4/2019

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Abstract

This study aimed to investigate an improved setup protocol for maintaining patient setup accuracy, with minimal or no use of image-guided radiation therapy in conventional radiotherapy for lung cancer. A coordinate value for the treatment couch in the anterior–posterior (AP) direction was obtained from the first fraction using bony anatomy image guidance. The coordinate value was invariably used for patient positioning in the second and subsequent treatment fractions. The errors of 2410 setup image sets (anterior and lateral) from 105 patients with lung cancer were analyzed. The systematic and random patient positioning errors in the AP direction were 0.6 ± 1.0 mm. Such errors accounted for 97% of all fractions within ± 2 mm. The protocol resulted in minimal patient setup errors in the AP direction using only one image for guidance; therefore, it may be applied to conventional radiotherapy for lung cancer in case of insufficient image guidance.
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Metadata
Title
Technical note: improved positioning protocol for patient setup accuracy in conventional radiotherapy for lung cancer
Authors
Hongbo Chai
Yuichiro Narita
Masafumi Takagi
Mikiko Kudo
Tomomi Kimura
Keiichi Kattou
Publication date
01-12-2019
Publisher
Springer Singapore
Published in
Radiological Physics and Technology / Issue 4/2019
Print ISSN: 1865-0333
Electronic ISSN: 1865-0341
DOI
https://doi.org/10.1007/s12194-019-00537-3

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