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
1Applied Physics Division, National Institute of Standards and Technology (NIST), Boulder, CO, United States, 2NINDS, National Institutes of Health (NIH), Bethesda, MD, United States
We show how conventional theory of
meander-line surface coils has been misinterpreted, leading to poor coil field
uniformity. Using corrected theory, we demonstrate
how a simple, single-wire correction improves B1 uniformity an order of
magnitude.
Fig 3. Side-view
(cross-section) MRI mappings of contours of equal magnetic field magnitude
above the planar meander-line surface coils shown in figure 2. Field contours are shown above even meander-line
coil with 8 current lines and above odd meander-line coil with 7 current lines
and added split-current return path.
Fig 2. Photographs
of two meander-line coils. (A) Coil with an even number (8) of wires. (B)
Coil with an odd number (7) of wires and an added split-current return path
