Clinical relevance of different dose calculation strategies for mediastinal IMRT in Hodgkin’s disease
Background and purposeConventional algorithms show uncertainties in dose calculation already for three-dimensional conformal radiotherapy (3D-CRT). Intensity-modulated radiotherapy (IMRT) might even increase these. We wanted to assess differences in dose distribution for pencil beam (PB), collapsed...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 June 2012
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| In: |
Strahlentherapie und Onkologie
Year: 2012, Jahrgang: 188, Heft: 8, Pages: 653-659 |
| ISSN: | 1439-099X |
| DOI: | 10.1007/s00066-012-0144-x |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1007/s00066-012-0144-x Verlag, Volltext: https://doi.org/10.1007/s00066-012-0144-x 
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| Verfasserangaben: | J. Koeck, Y. Abo-Madyan, H.T. Eich, F. Stieler, J. Fleckenstein, J. Kriz, R.-P. Mueller, F. Wenz, F. Lohr |
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| 245 | 1 | 0 | |a Clinical relevance of different dose calculation strategies for mediastinal IMRT in Hodgkin’s disease |c J. Koeck, Y. Abo-Madyan, H.T. Eich, F. Stieler, J. Fleckenstein, J. Kriz, R.-P. Mueller, F. Wenz, F. Lohr |
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| 520 | |a Background and purposeConventional algorithms show uncertainties in dose calculation already for three-dimensional conformal radiotherapy (3D-CRT). Intensity-modulated radiotherapy (IMRT) might even increase these. We wanted to assess differences in dose distribution for pencil beam (PB), collapsed cone (CC), and Monte Carlo (MC) algorithm for both 3D-CRT and IMRT in patients with mediastinal Hodgkin lymphoma.Patients and methodsBased on 20 computed tomograph (CT) datasets of patients with mediastinal Hodgkin lymphoma, we created treatment plans according to the guidelines of the German Hodgkin Study Group (GHSG) with PB and CC algorithm for 3D-CRT and with PB and MC algorithm for IMRT. Doses were compared for planning target volume (PTV) and organs at risk.ResultsFor 3D-CRT, PB overestimated PTV95 and V20 of the lung by 6.9% and 3.3% and underestimated V10 of the lung by 5.8%, compared to the CC algorithm. For IMRT, PB overestimated PTV95, V20 of the lung, V25 of the heart and V10 of the female left/right breast by 8.1%, 25.8%, 14.0% and 43.6%/189.1%, and underestimated V10 of the lung, V4 of the heart and V4 of the female left/right breast by 6.3%, 6.8% and 23.2%/15.6%, compared to MC.ConclusionThe PB algorithm underestimates low doses to the organs at risk and overestimates dose to PTV and high doses to the organs at risk. For 3D-CRT, a well-modeled PB algorithm is clinically acceptable; for IMRT planning, however, an advanced algorithm such as CC or MC should be used at least for part of the plan optimization. | ||
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