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A planning study to optimise a simultaneously integrated boost treatment of larynx cancer with seven intensity-modulated radiation therapy (IMRT) beams

Published online by Cambridge University Press:  30 July 2018

M. Erraoudi ,
M. A. Youssoufi ,
F. Bentayeb  and
M. R. Malisan
M. Erraoudi
Affiliation:
Faculty of Sciences, Mohammed V University, Rabat, Morocco
M. A. Youssoufi
Affiliation:
Faculty of Sciences, Mohammed V University, Rabat, Morocco
F. Bentayeb*
Affiliation:
Faculty of Sciences, Mohammed V University, Rabat, Morocco
M. R. Malisan
Affiliation:
International Centre for Theoretical Physics, Trieste, Italy
*
Author for correspondence: F. Bentayeb, Department of Physics, Faculty of Sciences, B.P. 1014, 10000 Rabat, Morocco. Tel: 00212 668460012. E-mail: [email protected]
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Abstract

Background

Intensity-modulated radiation therapy (IMRT) is one of the most reported techniques for head and neck cancer treatment, as it allows a good coverage of the planning target volume (PTV) while sparing the surrounding organs at risk (OAR) better than conventional conformal radiotherapy. The objective of this work is to optimise an IMRT technique for the simultaneously integrated boost (SIB) treatment of larynx cancer delivering a total dose of 69·96 Gy to the boost volume and 54·45 Gy to the elective volume in 33 fractions.

Methods

Three IMRT techniques, each using seven equally spaced beams, were planned for a sample of 10 patients. The first two techniques (IMRT-0 and IMRT-26) differ only for the starting angle of the seven beams, whereas the third (IMRT-CT) combines both these techniques by delivering IMRT-0 in the first half of treatment, and IMRT-26 in the second half, thus taking advantage of using 14 beams in total while using seven at a time only. The planning results were compared according to the dose coverage, homogeneity and conformity of the two PTVs, as well as to the dose to OARs, that is, spinal cord, parotids, mandible, brainstem and healthy tissue (defined as the body volume minus the sum of PTVs).

Results

Basically the PTV coverage resulted acceptable and comparable with all the three techniques. Concerning OARs, statistically better results are obtained in IMRT-CT when compared with IMRT-26 and IMRT-0.

Conclusion

The IMRT-CT technique, combining two different seven-beam setups, delivered in two treatment phases, improves dose distribution without increasing delivery time.

Keywords

IMRT techniqueslarynx cancer treatmentOARs dosesoptimisationPTV dose homogeneity and conformity
Type
Technical Note
Information
Journal of Radiotherapy in Practice , Volume 17 , Issue 4 , December 2018 , pp. 447 - 454
Copyright
© Cambridge University Press 2018 

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