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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