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.
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