Figure 5.

1/g-factor maps for the (a) left-right horizontal and the (b) anterior-posterior horizontal phase encode directions for two-fold GRAPPA acceleration, R = 2. The blue boxes indicate where the maximum g-factor in the slice is located. In 85% of the brain, the SNR decrease is less than 15% for two-fold GRAPPA acceleration. The average SNR decrease in the brain is ~50% for R = 3 (data not shown). The monkey’s brain is outlined in black.