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
The following article describes the testing of a three-dimensional geometric distortion correction algorithm, with applications in radiotherapy planning. Magnetic resonance imaging is well known to suffer from geometric distortion and although in-plane distortion is now routinely corrected, in general, through-plane distortion remains uncorrected. This study investigates a three-dimensional and a two geometric distortion correction algorithm using a variety of test objects to establish their accuracy in the axial and coronal planes. An acceptable clinical range for radiotherapy is established for the two-dimensional and three-dimensional distortion correction algorithms using three slices and many slices.