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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Neuroimage. 2014 Oct 23;106:170–181. doi: 10.1016/j.neuroimage.2014.10.029

Table 2.

Measured perfusion signal-to-noise ratio (SNR), g-factor and total leakage factor (TLF) for pCASL imaging using SB- and MB-EPI within matched imaging slices in the middle or middle superior brain regions. Results are presented as mean ± S.D. from five healthy voluteers.*

MB
Factor		 SNRMB/SNRSB1 g-factor TLF (%)
MB-RFall MB-RFin Mean 90 percentile Mean 90 Percentile
3 0.95 ± 0.15 0.92 ± 0.13 1.12 ± 0.05 1.34 ± 0.06 1.3 ± 0.1 2.2 ± 0.2
4 0.89 ± 0.16 0.85 ± 0.10 1.15 ± 0.08 1.37 ± 0.10 1.6 ± 0.4 2.8 ± 0.4
5 0.86 ± 0.14 0.83 ± 0.15 1.18 ± 0.10 1.41 ± 0.07 2.8 ± 0.5 4.7 ± 0.6
6 0.82 ± 0.12 0.80 ± 0.14 1.22 ± 0.09 1.55 ± 0.06 3.6 ± 0.2 5.8 ± 0.2
*

SB represents single-band, MB multi-band, S.D. standard deviation, MB-RFall indicates imaging results of MB-EPI with all MB RF pulse components on, MB-RFin with only turning on the RF pulse component exciting slices spatially matching those of SB-EPI in the middle or middle superior brain region, and SB1 the first SB-EPI imaging scan.