Image processing for on-line reduction of thermometry artifacts
Quesson B, Denis de Senneville B, Moonen C, Mougenot C, Desbarats P
Laboratoire Imagerie Molculaire et fonctionnelle
The Proton Resonance Frequency (PRF) technique gives an estimate of the temperature changes by comparing phase contrast between dynamically acquired images and reference data sets. However, organ displacements due to physiological activity (heart and respiration) may induce important artefacts on apparent temperature maps. When motion effects have been reduced in the MR pulse sequences (e.g. saturation slabs, respiratory and/or cardiac synchronisation, navigators), additional image post-processing may be applied to reduce inter-scan motion related errors in PRF. The implemented approach demonstrates that temperature correction can be performed on line even without synchronisation techniques.