Scott Hanvey1, Martin Glegg, John Foster2
1Department of Clinical Physics & Bioengineering, Beatson West of Scotland Cancer Centre, Glasgow, Lanarkshire, United Kingdom; 2Glasgow Cardiac Magnetic Resonance Unit
In radiotherapy accurate localisation and definition of the planning target volume and its relationship to organs at risk is very important. For head and neck cancer patients MRI offers superior target delineation over CT. However, if the MRI scan is not acquired in the treatment position this can lead to a mismatch when registering with CT. The purpose of this study was to investigate 20 oropharynx cancer patients to determine whether it is necessary to immobilise patients for their MR radiotherapy planning scan or if a normal diagnostic MRI would suffice.