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01.12.2015 | Original Article

Simultaneous integrated vs. sequential boost in VMAT radiotherapy of high-grade gliomas

verfasst von: Dr. med. Mostafa Farzin, MD, Prof. Dr. med. Michael Molls, PD Dr. med. Sabrina Astner, Ina-Christine Rondak, Dipl.-Stat., Dr. rer. nat. Markus Oechsner, PhD

Erschienen in: Strahlentherapie und Onkologie | Ausgabe 12/2015

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Abstract

Background

In 20 patients with high-grade gliomas, we compared two methods of planning for volumetric-modulated arc therapy (VMAT): simultaneous integrated boost (SIB) vs. sequential boost (SEB). The investigation focused on the analysis of dose distributions in the target volumes and the organs at risk (OARs).

Method

After contouring the target volumes [planning target volumes (PTVs) and boost volumes (BVs)] and OARs, SIB planning and SEB planning were performed. The SEB method consisted of two plans: in the first plan the PTV received 50 Gy in 25 fractions with a 2-Gy dose per fraction. In the second plan the BV received 10 Gy in 5 fractions with a dose per fraction of 2 Gy. The doses of both plans were summed up to show the total doses delivered. In the SIB method the PTV received 54 Gy in 30 fractions with a dose per fraction of 1.8 Gy, while the BV received 60 Gy in the same fraction number but with a dose per fraction of 2 Gy.

Results

All of the OARs showed higher doses (D_max and D_mean) in the SEB method when compared with the SIB technique. The differences between the two methods were statistically significant in almost all of the OARs. Analysing the total doses of the target volumes we found dose distributions with similar homogeneities and comparable total doses.

Conclusion

Our analysis shows that the SIB method offers advantages over the SEB method in terms of sparing OARs.

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Titel: Simultaneous integrated vs. sequential boost in VMAT radiotherapy of high-grade gliomas
verfasst von: Dr. med. Mostafa Farzin, MD
Prof. Dr. med. Michael Molls
PD Dr. med. Sabrina Astner
Ina-Christine Rondak, Dipl.-Stat.
Dr. rer. nat. Markus Oechsner, PhD
Publikationsdatum: 01.12.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Strahlentherapie und Onkologie / Ausgabe 12/2015
Print ISSN: 0179-7158
Elektronische ISSN: 1439-099X
DOI: https://doi.org/10.1007/s00066-015-0888-1

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Simultaneous integrated vs. sequential boost in VMAT radiotherapy of high-grade gliomas