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.