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Abstract #3025

Orientation mapping in visual areas at Ultra High Field

Keren Yang 1 , Rosa Sanchez Panchuelo 1 , Denis Schluppeck 2 , Richard W. Bowtell 1 , and Susan T. Francis 1

1 Sir Peter Mansfield Magnetic Resonance Centre, University of Nottingham, Nottingham, Nottinghamshire, United Kingdom, 2 School of Psychology, University of Nottingham, Nottingham, Nottinghamshire, United Kingdom

We use ultra-high field (7 Tesla) fMRI to assess orientation mapping in dorsal and ventral visual areas (V1, V2, V3). Within visual areas, the phase value of orientation maps are compared with those of angular-position from retinotopic maps, and are shown to display a high correlation (P<0.0001). Repeatability is shown to be high for both retinotopic and orientation maps. BOLD CNR is assessed as a function of number of repeat scans of orientation maps, with CNR being a factor of ~4 lower for orientation maps compared to retinotopic maps.

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