Elia Lombardo

MRI-guided radiotherapy (MRIgRT) is a highly complex treatment modality, allowing adaptation to anatomical changes occurring from one treatment day to the other (inter-fractional), but also to motion occurring during a treatment fraction (intra-fractional). In this vision paper, we describe the different steps of intra-fractional motion management during MRIgRT, from imaging to beam adaptation, and the solutions currently available both clinically and at a research level.

3. Results 3.1. Available Data One patient had to be excluded from the analysis because their ultrasound recordings contained outlier data. Another patient had to be excluded from the analysis because the relevant transversal slice was not assessable because multiple metal implants cast shadows on the symphysis (“metal artefacts”). This reduced the number of available patients to N = 100 and the number of available fractions to 1791.