Markus Henningsson1, Christian Stehning2, Claudia Prieto1, Peter Koken2, Rene M. Botnar1
1Division of Imaging Sciences & Biomedical Engineering, King's College London, London, United Kingdom; 2Philips Research Europe, Hamburg, Germany
Self-navigation techniques have been proposed to improve respiratory motion compensation in CMRA. However static structures within the navigator image can impede self-navigation motion estimation. To overcome this problem we have implemented a 2D Self-navigator by adding phase encoding gradients to the dummy pulses in a bSSFP sequence. With this approach we calculated foot-head and anterior-posterior motion and performed retrospective translational motion correction. We compared this novel method with a traditional 1D self-navigator, and a diaphragmatic 1D pencil beam navigator with a tracking factor 0.6. Initial results show improved motion correction with the 2D self-navigator.