Abstract
PurposeTo evaluate dose plans for head and neck organs at risk (OARs) for classical Hodgkin lymphoma (HL) patients using involved node radiotherapy (INRT) delivered as 3D conformal radiotherapy (3DCRT), volumetric modulated arc therapy (VMAT), and intensity modulated proton therapy (PT), in comparison to the past mantle field (MF). Materials and methodsData from 37 patients with cervical lymph node involvement were used. All patients originally received chemotherapy followed by 3DCRT–INRT (30.6Gy). A VMAT–INRT, PT–INRT (both 30.6Gy), and a MF plan (36Gy) were simulated. Doses to head and neck OARs were compared with cumulative DVHs and repeated measures ANOVA. ResultsThe estimated median mean doses were 15.3, 19.3, 15.4, and 37.3Gy (thyroid), 10.9, 12.0, 7.9, and 34.5Gy (neck muscles), 2.3, 11.1, 1.8, and 37.1Gy (larynx), 1.7, 5.1, 1.3, and 23.8Gy (pharynx), 0.5, 0.8, 0.01, and 32.3Gy (ipsilateral parotid), and 2.4, 3.8, 0.7, and 34.7Gy (ipsilateral submandibular) with 3DCRT, VMAT, PT, and MF (all p<0.0001), respectively. ConclusionThe use of INRT significantly lowered the estimated radiation dose to the head and neck OARs. VMAT appeared suboptimal compared to 3DCRT and PT, and for some patients, PT offered an additional gain.
Published Version
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