Abstract #3397

ASCII: Acquisition with Self-Correction for Image Inhomogeneity at 7T

Edward M Green^1,2, James C Korte^1,3, Bahman Tahayori^1,4,5, Yasmin Blunck^1,2, and Leigh A Johnston^1,2

¹Department of Biomedical Engineering, University of Melbourne, Parkville, Australia, ²Melbourne Brain Centre Imaging Unit, University of Melbourne, Parkville, Australia, ³Department of Physical Sciences, Peter MacCallum Cancer Centre, Parkville, Australia, ⁴Department of Medical Physics and Biomedical Engineering, Shiraz University of Medical Sciences, Shiraz, Iran (Islamic Republic of), ⁵Center for Neuromodulation and Pain, Shiraz, Iran (Islamic Republic of)

Inhomogeneity of the RF transmit field results in undesirable shading and brightening in high field imaging due to range of flip angles across the imaged object. A new method is proposed whereby two image volumes with coarse resolution in the slice direction are acquired at different flip angles and combined to produce an image volume at higher resolution and free of B1 inhomogeneity. Reconstruction quality is comparable to conventional super-resolution imaging, while image inhomogeneity caused by flip angle error is reduced. This is a flexible method applicable to a range of MRI sequences to correct B1 inhomogeneity.

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