Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2016  |  Volume : 41  |  Issue : 2  |  Page : 92-99

Dosimetric differences in flattened and flattening filter-free beam treatment plans


1 Department of Medical Physics; Department of Human Oncology, University of Wisconsin, Madison, USA
2 Department of Human Oncology, University of Wisconsin, Madison; Riverview Cancer Center, University of Wisconsin, Wisconsin Rapids, Wisconsin, USA
3 Riverview Cancer Center, University of Wisconsin, Wisconsin Rapids, Wisconsin, USA

Correspondence Address:
Bhudatt R Paliwal
Department of Human Oncology and Medical Physics, University of Wisconsin, School of Medicine and Public Health, K4/B47 CSC, 600 Highland Ave, Madison, Wisconsin 53792
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.181636

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This study investigated the dosimetric differences in treatment plans from flattened and flattening filter-free (FFF) beams from the TrueBeam System. A total of 104 treatment plans with static (sliding window) intensity-modulated radiotherapy beams and volumetric-modulated arc therapy (VMAT) beams were generated for 15 patients involving three cancer sites. In general, the FFF beam provides similar target coverage as the flattened beam with improved dose sparing to organ-at-risk (OAR). Among all three cancer sites, the head and neck showed more important differences between the flattened beam and FFF beam. The maximum reduction of the FFF beam in the mean dose reached up to 2.82 Gy for larynx in head and neck case. Compared to the 6 MV flattened beam, the 10 MV FFF beam provided improved dose sparing to certain OARs, especially for VMAT cases. Thus, 10 MV FFF beam could be used to improve the treatment plan.


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