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. 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 2.

Median raw SNR and normalized SNR (nSNR: cm−3 min−1/2) values for all spectroscopic imaging techniques for NAA and Lac in a phantom (N=4 scans). Standard deviation between the 4 scans is shown (for nSNR only) as median ± SD and the median variation within each scan is also presented as %CV. The Lac:NAA median ratio is displayed in the far right column.

Encoding Technique NAA raw SNR NAA nSNR Lac raw SNR Lac nSNR Lac:NAA
Traditional MRSI 190.75 40.83 ± 1.53 (9.10%) 43.43 9.30 ± 0.12 (15.20%) 0.23
Ellipsoidal MRSI 289.92 38.26 ± 1.23 (9.09%) 65.53 8.65 ± 0.21 (14.86%) 0.23
SENSE MRSI (Rx=2) 83.86 25.15 ± 0.77 (16.64%) 19.17 5.75 ± 0.23 (21.22%) 0.23
SENSE w/REG 115.18 34.54 ± 2.41 (14.45%) 22.81 6.84 ± 0.38 (24.06%) 0.20
Flyback EPSI 116.03 37.20 ± 0.29 (9.10%) 25.22 8.08 ± 0.17 (12.32%) 0.22
Symmetric EPSI 109.87 35.32 ± 1.48 (9.52%) 22.18 7.13 ± 0.53 (14.07%) 0.21
Symmetric w/ramps 105.36 39.64 ± 1.39 (7.46%) 20.95 7.88 ± 0.32 (14.12%) 0.20