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Abstract #0971

Initial Human Imaging Experience with a Head-only Gradient System Utilizing 80 mT/m and 500 T/m/s

John Huston III 1 , Shengzhen Tao 1 , Joshua D. Trzasko 1 , Paul T. Weavers 1 , Yunhong Shu 1 , Erin Gray 1 , Seung-Kyun Lee 2 , Jean-Baptiste Mathieu 2 , Christopher J. Hardy 2 , John Schenck 2 , Ek Tsoon Tan 2 , Thomas K.F. Foo 2 , and Matt A. Bernstein 1

1 Radiology, Mayo Clinic, Rochester, MN, United States, 2 GE Global Research, Niskayuna, NY, United States

A second generation head-only gradient system with asymmetric transverse coils and all hollow-conductor coils was constructed and human volunteers imaged. Testing occurred inside a conventional whole-body 3T magnet to assess image quality and peripheral nerve stimulation (PNS). The gradient was integrated with a custom-built birdcage transmit/receive coil and a Nova 32-channel receiver array. Initial experience demonstrated high quality brain images with gradients performing at 80 mT/m and 500 T/m/s simultaneously while minimizing peripheral nerve stimulation. In addition, a novel integrated gradient nonlinearity correction strategy was found to improve in vivo images acquired on this system.

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