Abstract #1587

Balanced steady-state free precession imaging and associated rapid relaxation time mapping on a point-of-care 46 mT Halbach MRI scanner

Chloé Najac¹, Florian Birk^2,3, Tom O’Reilly¹, Klaus Scheffler^2,3, Andrew Webb¹, and Rahel Heule^2,3,4

¹C.J. Gorter MRI Center, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands, ²Department of High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, ³Department of Biomedical Magnetic Resonance, University of Tübingen, Tübingen, Germany, ⁴Center for MR Research, University Children's Hospital, Zurich, Switzerland

Synopsis

Keywords: Low-Field MRI, Data AcquisitionPoint-of-care imaging with low-field MRI (<0.1T) is a potential game changer for low-income countries and the intensive care unit. The main challenge is the low SNR. Balanced steady-state free precession (bSSFP) sequences are fast and SNR-efficient. However, bSSFP is very sensitive to B₀ inhomogeneities resulting in banding artifacts. We evaluated the feasibility of using bSSFP on our 46 mT MRI scanner. By acquiring 17 bSSFP datasets with linearly increasing frequency offsets (from 0 to 1/TR), we could reconstruct banding-free maximum-intensity images as well as F₀ and F_-1 SSFP configurations, which we employed for rapid relaxation time mapping.

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