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Abstract #2565

2D Diaphragm navigation with rapid gradient echo images: validation at 3T and application at 7T

Aaron T Hess 1 , Andre JW van der Kouwe 2,3 , Matthew Dylan Tisdall 2 , Stefan Neubauer 1 , and Matthew D Robson 1

1 Oxford Centre for Clinical Magnetic Resonance Research (OCMR), Oxford, Ox, United Kingdom, 2 Radiology, Harvard Medical School, Boston, MA, United States, 3 Martinos Center, Massachusetts General Hospital, Boston, MA, United States

A novel 2D rapid gradient echo navigator is proposed for real time diaphragm navigation. At ultrahigh fields (>3T) traditional diaphragm navigators are challenging due to either large B0 gradients, limited B1+ or SAR demands. The proposed gradient echo navigator requires minimum B1+ and takes ~70 ms to acquire. The new 2D navigator is compared to a product 1D cross paired navigator at 3T, and is demonstrated to be robust and reliable at 7T. The contrast to noise is of the new 2D navigator is similar to that of the cross paired navigator, with an improved diaphragm edge sharpness.

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