. Author manuscript; available in PMC: 2011 Feb 10.

Published in final edited form as: J Magn Reson Imaging. 2009 Sep;30(3):473–480. doi: 10.1002/jmri.21834

Table 4.

NAA linewidths for phantom and volunteers. Median values of the median linewidths are shown with standard deviation of the median linewidths as ±S.D. All voxels within the PRESS box were included for the phantom data, while only voxels containing at least 90% NAWM were used in the volunteer analysis.

Encoding Technique	Phantom (N=4) NAA Linewidth (HZ)	Volunteer (N=10) NAA Linewidth (HZ)
Traditional MRSI	6.2 ± 0.13	10.1 ± 0.64
Ellipsoidal MRSI	6.2 ± 0.15	10.3 ± 0.72
SENSE MRSI (R_x=2)	5.5 ± 0.22	9.2 ± 0.89
Flyback EPSI	5.9 ± 0.12	10.6 ± 0.50
Symmetric EPSI	6.5 ± 0.09	11.0 ± 0.52
Symmetric EPSI w/ramps	6.5 ± 0.11	11.1 ± 0.62