Anatomical changes 1 Anatomical modeling 1 Average modeling 1 Computerized tomography 1 Forecasting 1 Head-and-neck cancer 1 Hounsfield units 1 Individual modeling 1 Institute of Physics 1 Planning CT Proton beam therapy 1 Proton beams 1 Proton therapy 1 Statistical tests 1 Uncertainty evaluation 1 anatomical model 1 proton therapy 1 uncertainty evaluation 1