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Abstract #1401

Correcting meander-line surface coil fields for large-area near-surface imaging

Gary Zabow1, Stephen Dodd2, and Alan Koretsky2
1Applied Physics Division, National Institute of Standards and Technology (NIST), Boulder, CO, United States, 2NINDS, National Institutes of Health (NIH), Bethesda, MD, United States

Planar meander-line coils have been proposed as ideal surface coils because they should, theoretically, create highly uniform fields over planes of essentially unlimited area. Experimentally, however, field uniformity of planar meander-line coils is often worse, not better, than even simple loop surface coils. This presentation shows why existing predictions of meander-line coil fields and imaging performance are misinterpreted and how coil geometries can be simply corrected to better match theory. In particular, it is shown how a single extra turn of wire can increase field uniformity by at least an order of magnitude, allowing for uniform, large-area near-surface imaging.

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