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Radiation Oncology
Published in: Radiation Oncology 1/2014

Open Access 01-12-2014 | Research

Prostatic displacement during extreme hypofractionated radiotherapy using volumetric modulated arc therapy (VMAT)

Authors: Adam Gladwish, Geordi Pang, Patrick Cheung, Laura D’Alimonte, Andrea Deabreu, Andrew Loblaw

Published in: Radiation Oncology | Issue 1/2014

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Abstract

Background

To determine prostate displacement during extreme hypofractionated volume modulated arc radiotherapy (VMAT) using pre- and post-treatment orthogonal images with three implanted gold seed fiducial markers.

Methods

A total of 150 image pairs were obtained from 30 patients who underwent extreme hypofractionated radiotherapy to a dose of 40 Gy in five fractions on standard linear accelerators. Position verification was obtained with orthogonal x-rays before and after treatment and were used to determine intra-fraction prostate displacement.

Results

The mean prostate displacements were 0.03 ± 1.23 mm (1SD), 0.18 ± 1.55 mm, and 0.37 ± 1.95 mm in the left-right, superior-inferior, and anterior-posterior directions, respectively. The mean 3D displacement was 2.32 ± 1.55 mm. Only 6 (4%) fractions had a 3D displacement of >5 mm. The average time of treatment delivery for a given fraction was 195 ± 59 seconds.

Conclusions

The mean intra-fraction prostate displacement during a course of extreme hypofractionated radiotherapy delivered via VMAT, continues to be small. Clinical margins typically used in a similar fixed-angle IMRT treatment are adequate. The use of VMAT in further extreme hypofractionation may limit prostatic motion uncertainties that would be otherwise be associated with longer treatment times.
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Metadata
Title
Prostatic displacement during extreme hypofractionated radiotherapy using volumetric modulated arc therapy (VMAT)
Authors
Adam Gladwish
Geordi Pang
Patrick Cheung
Laura D’Alimonte
Andrea Deabreu
Andrew Loblaw
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Radiation Oncology / Issue 1/2014
Electronic ISSN: 1748-717X
DOI
https://doi.org/10.1186/s13014-014-0262-y

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