SU-E-T-371: Impact of Small MU/segment and High Dose Rate on Volumetric Modulated Arc Therapy (VMAT) Delivery

2012 ◽  
Vol 39 (6Part15) ◽  
pp. 3789-3789
Keyword(s):  
Dose Rate ◽  
Volumetric Modulated Arc Therapy ◽  
High Dose Rate ◽  
High Dose ◽  
Arc Therapy

scholarly journals Image guided high-dose-rate brachytherapy versus volumetric modulated arc therapy for head and neck cancer: A comparative analysis of dosimetry for target volume and organs at risk

2018 ◽  
Vol 52 (4) ◽  
pp. 461-467
Author(s):  
Hironori Akiyama ◽  
Csilla Pesznyák ◽  
Dalma Béla ◽  
Örs Ferenczi ◽  
Tibor Major ◽  
...  
Keyword(s):  
Head And Neck Cancer ◽  
Head And Neck ◽  
Dose Rate ◽  
Organs At Risk ◽  
Volumetric Modulated Arc Therapy ◽  
Target Volume ◽  
High Dose Rate ◽  
High Dose ◽  
Image Guided ◽  
Arc Therapy

Abstract Background The aim of the study was to present dosimetric comparison of image guided high-dose-rate brachytherapy (IGBT) with volumetric modulated arc therapy (VMAT) for head and neck cancer regarding conformity of dose distribution to planning target volume (PTV) and doses to organs at risk (OARs). Patients and methods Thirty-eight consecutive patients with T1-4 mobile tongue, floor of mouth and base of tongue cancer treated with IGBT were selected. For these patients additional VMAT treatment plans were also prepared using identical computed tomography data. OARs and PTV related parameters (e.g. V98, D0.1cm3, Dmean, etc.) were compared. Results Mean V98 of the PTV was 90.2% vs. 90.4% (p > 0.05) for IGBT and VMAT, respectively. Mean D0.1cm3 to the mandible was 77.0% vs. 85.4% (p < 0.05). Dmean to ipsilateral and contralateral parotid glands was 4.6% vs. 4.6% and 3.0% vs. 3.9% (p > 0.05). Dmean to ipsilateral and contralateral submandibular glands was 16.4% vs. 21.9% (p > 0.05) and 8.2% vs. 16.9% (p < 0.05), respectively. Conclusions Both techniques showed excellent target coverage. With IGBT dose to normal tissues was lower than with VMAT. The results prove the superiority of IGBT in the protection of OARs and the important role of this invasive method in the era of new external beam techniques.

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