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Abstract #2876

Accelerated Variable Density Spiral at 7 Tesla using Parallel Imaging

Peter Brnert1,2, Wei Lin3, Feng Huang3, Tim Nielsen1, Andrew Webb2, Matthias J. P. van Osch2

1Philips Research Laboratories, Hamburg, Germany; 2Department of Radiology, C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands; 3Philips Healthcare, Invivo Corporation, Gainesville, United States

Spiral imaging is a very efficient and versatile MR sampling that can find interesting applications at 7T. But the spiral is sensitive to off-resonance effects, a problem especially present at high fields, resulting in a loss of spatial resolution. Parallel imaging could help to reduce such off-resonance artifacts by shortening the acquisition window. In this work, a rapid, non-iterative k-space-based parallel imaging reconstruction method is proposed. It estimates the missing k-space data and allows after appropriate image combination off-resonance correction in a very efficient way. This approach was successfully tested at 7T in vivo applications resulting in improved image quality.