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Open Access 01-12-2010 | Research

Biological impact of geometric uncertainties: what margin is needed for intra-hepatic tumors?

Authors: Hsiang-Chi Kuo, Wen-Shan Liu, Andrew Wu, Dennis Mah, Keh-Shih Chuang, Linda Hong, Ravi Yaparpalvi, Chandan Guha, Shalom Kalnicki

Published in: Radiation Oncology | Issue 1/2010

Abstract

Background

To evaluate and compare the biological impact on different proposed margin recipes for the same geometric uncertainties for intra-hepatic tumors with different tumor cell types or clinical stages.

Method

Three different margin recipes based on tumor motion were applied to sixteen IMRT plans with a total of twenty two intra-hepatic tumors. One recipe used the full amplitude of motion measured from patients to generate margins. A second used 70% of the full amplitude of motion, while the third had no margin for motion. The biological effects of geometric uncertainty in these three situations were evaluated with Equivalent Uniform Doses (EUD) for various survival fractions at 2 Gy (SF₂).

Results

There was no significant difference in the biological impact between the full motion margin and the 70% motion margin. Also, there was no significant difference between different tumor cell types. When the margin for motion was eliminated, the difference of the biological impact was significant among different cell types due to geometric uncertainties. Elimination of the motion margin requires dose escalation to compensate for the biological dose reduction due to the geometric misses during treatment.

Conclusions

Both patient-based margins of full motion and of 70% motion are sufficient to prevent serious dosimetric error. Clinical implementation of margin reduction should consider the tumor sensitivity to radiation.

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Title: Biological impact of geometric uncertainties: what margin is needed for intra-hepatic tumors?
Authors: Hsiang-Chi Kuo
Wen-Shan Liu
Andrew Wu
Dennis Mah
Keh-Shih Chuang
Linda Hong
Ravi Yaparpalvi
Chandan Guha
Shalom Kalnicki
Publication date: 01-12-2010
Publisher: BioMed Central
Published in: Radiation Oncology / Issue 1/2010
Electronic ISSN: 1748-717X
DOI: https://doi.org/10.1186/1748-717X-5-48

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Biological impact of geometric uncertainties: what margin is needed for intra-hepatic tumors?

Abstract

Background

Method

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Method

Results

Conclusions

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