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A study for the dosimetric evaluation of rotational setup error for lung stereotactic body radiation therapy*

Published online by Cambridge University Press:  01 August 2018

Sina Mossahebi ,
Ulrich Langner ,
Karl Prado ,
Minsik Lee  and
ByongYong Yi
Sina Mossahebi
Affiliation:
Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA
Ulrich Langner
Affiliation:
Department of Radiation Oncology, Boston University School of Medicine, Boston, MA, USA
Karl Prado
Affiliation:
Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA
Minsik Lee
Affiliation:
Department of Radiation Oncology, Asan Medical Center, University of Ulsan College School of Medicine, Seoul, Korea
ByongYong Yi*
Affiliation:
Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA
*
Author for correspondence: ByongYong Yi, Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA. Email: byi@umm.edu
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Abstract

Purpose

To investigate the necessity of rotational shifts by considering dosimetric impact of rotational errors on stereotactic body radiation therapy (SBRT).

Materials and methods

20 lung patients with the lesion size <5 cm treated with SBRT have been selected for dosimetric analysis. Three-dimensional dose has been rotationally shifted (±1°, ±3°, ±5° for pitch, roll and yaw) and overlaid to the original computed tomography images. The dose–volume histograms of 18-rotational plans of each patient were compared to those of the original plan.

Results

No significant dosimetric differences were observed in target coverage. For all of the cases up to 5° in any couch angle dose differences of D99 and D95 were <3%. Variations of conformity index were observed to be less than 0·05. None of the organ at risk doses exceeded the dose limit. The V20 differences of the ipsilateral and the total lungs were less than 0·4%.

Conclusion

It has been found to be unnecessary to perform rotational shifts up to 5° for lung SBRT treatments; the translational shift is sufficient for the cases used in this study. This method may be applied and tested after planning and before treatment initiation to rule out exceptionally extreme cases.

Keywords

lung SBRTrotationsetup errorsimulation
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 17 , Issue 4 , December 2018 , pp. 422 - 426
Copyright
© Cambridge University Press 2018 

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Footnotes

*

This article was originally published with Minsik Lee listed as the sole author. This has now been corrected and the other authors added. A corrigendum with the full explanation can be found at https://doi.org/10.1017/S146039691900075X.

Cite this article: Mossahebi S, Langner U, Prado K, Lee M and Yi B. (2018) A study for the dosimetric evaluation of rotational setup error for lung stereotactic body radiation therapy. Journal of Radiotherapy in Practice17: 420–424. doi: 10.1017/S1460396918000250

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