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Verfasst von:Fogliata, Antonella [VerfasserIn]   i
 Fleckenstein, Jens [VerfasserIn]   i
 Schneider, Frank [VerfasserIn]   i
 Lohr, Frank [VerfasserIn]   i
Titel:Flattening filter free beams from TrueBeam and Versa HD units
Titelzusatz:evaluation of the parameters for quality assurance
Verf.angabe:Antonella Fogliata, Jens Fleckenstein and Frank Schneider, Marc Pachoud and Sarah Ghandour, Harald Krauss, Giacomo Reggiori and Antonella Stravato, Frank Lohr, Marta Scorsetti and Luca Cozzi
Jahr:2016
Jahr des Originals:2015
Umfang:8 S.
Fussnoten:Gesehen am 10.01.2019 ; Published 23 December 2015
Titel Quelle:Enthalten in: Medical physics
Ort Quelle:Hoboken, NJ : Wiley, 1974
Jahr Quelle:2016
Band/Heft Quelle:43(2016), 1, Seite 205-212
ISSN Quelle:2473-4209
 1522-8541
Abstract:Purpose: Flattening filter free (FFF) beams generated by medical linear accelerators are today clinically used for stereotactical and non-stereotactical radiotherapy treatments. Such beams differ from the standard flattened beams (FF) in the high dose rate and the profile shape peaked on the beam central axis. Definition of new parameters as unflatness and slope for FFF beams has been proposed based on a renormalization factor for FFF profiles. The present study aims to assess the dosimetric differences between FFF beams generated by linear accelerators from different vendors, and to provide renormalization and parameter data of the two kinds of units. Methods: Dosimetric data from two Varian TrueBeam and two Elekta Versa HD linear accelerators, all with 6 and 10 MV nominal accelerating potentials, FF and FFF modes have been collected. Renormalization factors and related fit parameters according to Fogliata et al. [“Definition of parameters for quality assurance of flattening filter free (FFF) photon beams in radiation therapy,” Med. Phys. 39, 6455-6464 (2012)] have been evaluated for FFF beams of both units and energies. Unflatness and slope parameters from profile curves were evaluated. Dosimetric differences in terms of beam penetration and near-the-surface dose were also assessed. Results: FFF profile parameters have been updated; renormalization factors and unflatness from the Varian units are consistent with the published data. Elekta FFF beam qualities, different from the Varian generated beams, tend to express similar behaviour as the FF beam of the corresponding nominal energy. TPR20,10 for 6 and 10 MV FF and FFF TrueBeam beams are 0.665, 0.629 (6 MV) and 0.738, 0.703 (10 MV). The same figures for Versa HD units are 0.684, 0.678 (6 MV) and 0.734, 0.721 (10 MV). Conclusions: Renormalization factor and unflatness parameters evaluated from Varian and Elekta FFF beams are provided, in particular renormalization factors table and fit parameters.
DOI:doi:10.1118/1.4938060
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: http://dx.doi.org/10.1118/1.4938060
 Volltext: https://aapm-onlinelibrary-wiley-com.ezproxy.medma.uni-heidelberg.de/doi/abs/10.1118/1.4938060
 DOI: https://doi.org/10.1118/1.4938060
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Data analysis
 dosimetric parameters
 dosimetry
 Dosimetry
 Dosimetry/exposure assessment
 Field size
 flattening filter free beams
 including brachytherapy
 Ionization chambers
 linear accelerators
 Linear accelerators
 Materials properties
 Medical accelerators
 Photons
 quality assurance
 Quality assurance
 Quality assurance in radiotherapy
 radiation therapy
 Radiation therapy
 renormalisation
 Renormalization
 Scintigraphy
 Therapeutic applications
K10plus-PPN:1586125338
Verknüpfungen:→ Zeitschrift

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