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Abstract #3286

Enhanced gradient capabilities at 7T using a three-axes plug-and-play head gradient insert.

Gerrit Cornelis Arends1, Chantal M.W. Tax2,3, Carel van Leeuwen4, Matthias I. Wienke5, Wout I. Schuth5, Thomas H.M. Roos2, Jeroen C.W. Siero2,6, Dennis J.W. Klomp2, and Edwin Versteeg2
1UMC Utrecht, Utrecht, Netherlands, 2Center for Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands, 3Cardiff University Brain Research Imaging Centre, Cardiff, United Kingdom, 4Tesla DC, Zaltbommel, Netherlands, 5Futura Composites BV, Heerhugowaard, Netherlands, 6Spinoza Centre for Neuroimaging, Amsterdam, Netherlands

Synopsis

Keywords: Gradients, Gradients

Motivation: Strong gradients will shorten the echo time, increase the signal-to-noise ratio and can probe smaller diffusion length scales. Local gradient inserts can mitigate peripheral nerve stimuliation.

Goal(s): To characterize the gradient insert field strength and to show the feasibility of diffusion MRI with the gradient insert.

Approach: A 65 kg three-axis gradient coil was added to a 7T system. Gradient distributions were mapped using B0-field maps. 2D Pulsed Gradient Spin-Echo sequences with EPI readout were performed on a phantom.

Results: Field mapping showed gradient efficiency of [0.29, 0.31, 0.53]mT/m/A for the X,Y,Z-gradient respectively. Pulsed Gradient Spin-Echo sequences with b=[5,21]s/mm2 showed sensible signal attenuation.

Impact: Plug-and-play gradients provide a cost-effective alternative to expensive MRI systems with dedicated high-performance gradients. They improve accessibility for researchers with limited resources to conduct advanced diffusion, structural, and functional MRI experiments.

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Keywords