Scott Hanvey1, John Foster2
1Radiotherapy Physics, Beatson West of
Scotland Cancer Centre, Glasgow, Lanarkshire, United Kingdom; 2MRI
Physics, Beatson West of Scotland Cancer Centre, Glasgow, United Kingdom
Accurate
localisation of the planning target volume (PTV) is vitally important in
radiotherapy. The excellent soft tissue contrast of magnetic resonance
imaging (MRI) makes it an ideal imaging modality for radiotherapy of the
prostate. Registration of MRI with CT
can be problematic since the MRI table is not generally flat. The following
study compared the accuracy of the registration of MRI with CT in 20 prostate
patients receiving an MRI in the typical curved table and on a specially
designed flat table. It also measured the PTVs of patients in the normal and
radiotherapy position in MRI.