open access

Vol 16, No 1 (2011)
Published online: 2011-01-01
Submitted: 2010-04-30
Get Citation

Anatomy-corresponding method of IMRT verification

Janusz Winiecki, Zbigniew Żurawski, Barbara Drzewiecka, Krzysztof Ślosarek
DOI: 10.1016/j.rpor.2010.11.001
·
Rep Pract Oncol Radiother 2011;16(1):1-9.

open access

Vol 16, No 1 (2011)
Published online: 2011-01-01
Submitted: 2010-04-30

Abstract

Background

During a proper execution of dMLC plans, there occurs an undesired but frequent effect of the dose locally accumulated by tissue being significantly different than expected. The conventional dosimetric QA procedures give only a partial picture of the quality of IMRT treatment, because their solely quantitative outcomes usually correspond more to the total area of the detector than the actually irradiated volume.

Aim

The aim of this investigation was to develop a procedure of dynamic plans verification which would be able to visualize the potential anomalies of dose distribution and specify which tissue they exactly refer to.

Materials & methods

The paper presents a method discovered and clinically examined in our department. It is based on a Gamma Evaluation concept and allows accurate localization of deviations between predicted and acquired dose distributions, which were registered by portal as well as film dosimetry. All the calculations were performed on the self-made software GammaEval, the γ-images (2-dimensional distribution of γ-values) and γ-histograms were created as quantitative outcomes of verification.

Results

Over 150 maps of dose distribution have been analyzed and the cross-examination of the gamma images with DRRs was performed.

Conclusions

It seems, that the complex monitoring of treatment would be possible owing to the images obtained as a cross-examination of γ-images and corresponding DRRs.

Abstract

Background

During a proper execution of dMLC plans, there occurs an undesired but frequent effect of the dose locally accumulated by tissue being significantly different than expected. The conventional dosimetric QA procedures give only a partial picture of the quality of IMRT treatment, because their solely quantitative outcomes usually correspond more to the total area of the detector than the actually irradiated volume.

Aim

The aim of this investigation was to develop a procedure of dynamic plans verification which would be able to visualize the potential anomalies of dose distribution and specify which tissue they exactly refer to.

Materials & methods

The paper presents a method discovered and clinically examined in our department. It is based on a Gamma Evaluation concept and allows accurate localization of deviations between predicted and acquired dose distributions, which were registered by portal as well as film dosimetry. All the calculations were performed on the self-made software GammaEval, the γ-images (2-dimensional distribution of γ-values) and γ-histograms were created as quantitative outcomes of verification.

Results

Over 150 maps of dose distribution have been analyzed and the cross-examination of the gamma images with DRRs was performed.

Conclusions

It seems, that the complex monitoring of treatment would be possible owing to the images obtained as a cross-examination of γ-images and corresponding DRRs.

Get Citation

Keywords

IMRT; QA; Portal dosimetry; Gamma Evaluation; Plan verification; DRR

About this article
Title

Anatomy-corresponding method of IMRT verification

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 16, No 1 (2011)

Pages

1-9

Published online

2011-01-01

DOI

10.1016/j.rpor.2010.11.001

Bibliographic record

Rep Pract Oncol Radiother 2011;16(1):1-9.

Keywords

IMRT
QA
Portal dosimetry
Gamma Evaluation
Plan verification
DRR

Authors

Janusz Winiecki
Zbigniew Żurawski
Barbara Drzewiecka
Krzysztof Ślosarek

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