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Abstract #2573

B1 Self-Calibration for Artifact Removal in Radial Hyperpolarised 3He Lung Imaging

Helen Marshall1, Salma Ajraoui1, Martin Deppe1, James M. Wild1

1Academic Unit of Radiology, University of Sheffield, Sheffield, South Yorkshire, United Kingdom

In hyperpolarised 3He lung MRI the transverse signal decays with each RF excitation, imposing a k-space filter on the acquired data. For radially acquired data this filter causes streaking, angular shading and loss of spatial resolution in the images. Radial acquisition samples the centre of k-space with every projection, so tracking the signal decay. The inverse of this decay function was used to retrospectively compensate the data leading to improved image quality. The average flip angle per slice was calculated from the radial data and found to correspond well with conventional flip angle maps providing a means of B1 self-calibration.