Artificial scotoma estimation based on population receptive field mapping

ABSTRACT Population receptive field (pRF) mapping based on functional magnetic resonance imaging (fMRI) is an ideal method for obtaining detailed retinotopic information. One particularly promising application of pRF mapping is the estimation and quantification of visual field effects, for example scotomata in patients suffering from macular dysfunction or degeneration (MD) or hemianopic defects in patients with intracranial dysfunction. However, pRF mapping performance is influenced by a number of factors including spatial and temporal resolution, distribution of dural venous sinuses and patient performance. This study addresses the ability of current pRF methodology to assess the size of simulated scotomata in healthy individuals. The data demonstrate that central scotomata down to a radius of 2.35° (4.7° diameter) visual angle can be reliably estimated in single subjects using high spatial resolution protocols and multi‐channel receive array coils. HighlightsCentral scotomata size assessment by population Receptive Field (pRF) mapping using fMRI.Scotomata size can be reliably estimated down to radius of 2.35° in single subjects.The method could complement microperimetry examinations in patients suffering from macular dysfunction.

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