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Abstract #1652

High-Resolution Diffusion Tensor Imaging (DTI) of the Human Head at 7T: First Results with a 70 MT/m Whole Body Gradient System

Ralf Luetzkendorf1, Oliver Speck2, John Grinstead3, Joerg Stadler4, Johannes Bernarding1

1Department for Biometry and Medical Informatics, OvG University Magdeburg, Magdeburg, Saxony Anhalt, Germany; 2Biomedical Magnetic Resonance, OvG University Magdeburg, Magdeburg, Germany; 3Siemens Medical Solutions USA, Inc; 4Leibniz Institute for Neurobiology

High resolution DTI at ultra-high fields is advantageous as the initially higher signal-to-noise ratio allows to increase the resolution while simultaneously counteracting the according signal losses. Stronger gradients will also enable to apply larger diffusion-weighting at still acceptable TE times. We aimed to reduce TE to overcome the disadvantages of ultra high field conditions such as increased distortions and shortened T2 values. To this purpose we used a new 70 mT/m whole body gradient system for a 7T MR scanner and an improved DTI sequence with a single refocusing pulse to acquire isotropic DTI images with a resolution of (1.4 mm) 3.