Self-Navigation with a 1D Pencil Beam Navigator

Markus Henningsson¹, Rene M. Botnar¹

Self-navigators offers a model free alternative to diaphragmatic navigators for respiratory motion correction in coronary MRA. In this study we have investigated the use of a pencil beam 1D navigator (1Dnav) with large diameter (~100mm) and small flip angle (10) for direct measurements of the respiratory motion of the heart, comparing it to the conventional approach which uses a 1Dnav positioned on the diaphragm and a tracking factor of 0.6. We show that the 1Dnav is feasible for self-navigation and shows improved motion compensation compared to the diaphragmatic 1D navigator.