• Damien C Weber, Nicolas Peguret, Giovanna Dipasquale, and Luca Cozzi.
• Department of Radiation Oncology, Geneva University Hospital, University of Geneva, Geneva, Switzerland. damien.weber@medecine.unige.ch
• Int. J. Radiat. Oncol. Biol. Phys. 2009 Dec 1; 75 (5): 1578-86.

PurposeA comparative treatment planning study was performed to compare volumetric-modulated arc (RA) to conventional intensity modulated (IMRT) for involved-field (IFRT) and involved-node (INRT) radiotherapy for Hodgkin lymphoma (HL).Methods And MaterialsPlans for 10 early-stage HL female patients were computed for RA and IMRT. First, the planning target volume (PTV) coverage and organs at risk (OAR) dose deposition was assessed between the two modalities. Second, the OAR (lung, breast, heart, thyroid, and submandibular gland) dose-volume histograms were computed and compared for IFRT and INRT, respectively.ResultsFor IFRT and INRT, PTV coverage was equally homogeneous with both RA and IMRT. By and large, the OAR irradiation with IFRT planning was not significantly different between RA and IMRT. For INRT, doses computed for RA were, however, usually lower than those with IMRT, particularly so for the lung, breast, and thyroid. Regardless of RA and IMRT modalities, a significant 20-50% decrease of the OAR computed mean doses was observed with INRT when compared with IFRT (Breast D(Mean) 1.5 +/- 1.1 vs. 2.6 +/- 1.7 Gy, p < 0.01 and 1.6 +/- 1.1 vs. 2.9 +/- 1.9 Gy, p < 0.01 for RA and IMRT, respectively).ConclusionsRA and IMRT results in similar level of dose homogeneity. With INRT but not IFRT planning, the computed doses to the PTV and OAR were usually higher and lower with RA when compared to IMRT. Regardless of the treatment modality, INRT when compared with IFRT planning led to a significant decrease in OAR doses, particularly so for the breast and heart.

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