DIR-based models to predict weekly anatomical changes in head and neck cancer proton therapy.

. We proposed two anatomical models for head and neck patients to predict anatomical changes during the course of radiotherapy..

Impact of varying planning parameters on proton pencil beam scanning dose distributions in four commercial treatment planning systems.

Purpose: In pencil beam scanning proton therapy, target coverage is achieved by scanning the pencil beam laterally in the x- and y-directions and delivering spots of dose to positions at a given radiological depth (layer). Dose is delivered to the spots on different layers by pencil beams of different energy until the entire volume has been irradiated. The aim of this study is to investigate the implementation of proton planning parameters (spot spacing, layer spacing and margins) in four commercial proton treatment planning systems (TPSs): Eclipse, Pinnacle , RayStation and XiO.