Reproducible patient positioning is important in radiotherapy (RT) of head-and-neck cancer. We therefore compared set-up errors in head-and-neck RT resulting from three different patient positioning systems. Patients were either treated with a standard head support (SHS) and conventional treatment couch (SHS-3, n = 10), a SHS and rotational couch (SHS-6, n = 10), or an individual head support (IHS) and rotational couch (IHS-6, n = 10). Interfraction mean translation vector lenghts were significantly lower for IHS-6 compared to SHS-3 (0.8 ± 0.3 mm vs. 1.4 ± 0.7 mm, P = 0.001). Intrafraction displacement was comparable among cohorts. This study showed that the use of a six degrees of freedom couch combined with an IHS in head-and-neck RT resulted in better interfraction reproducibility

Head-and-neck cancer, Immobilization, Head support, Set-up correction, Six degrees of freedom couch, Cone-beam CT,
Physics and Imaging in Radiation Oncology
Department of Radiation Oncology

Rodrigues, M.F., van der Veen, S., van Egmond, J, van Hameren, M., van Oorschot, T., de Vet, S., … Mast, M.E. (2019). The influence of a six degrees of freedom couch and an individual head support in patient positioning in radiotherapy of head and neck cancer. Physics and Imaging in Radiation Oncology, 11, 30–33. doi:10.1016/j.phro.2019.07.001