. Author manuscript; available in PMC: 2010 Jul 18.

Published in final edited form as: Magn Reson Med. 2010 Jun;63(6):1548–1556. doi: 10.1002/mrm.22329

Table 1.

CBF Measurements Using the Different Techniques (n = 20 Patients)^†

Method	Tmax_thresh	CBF (ml/100 g/min)	CBF Ratio	COV
xeCT (gold-standard)	–	35.8 ± 7.7	–
DSC	–	14.6 ± 6.3^*	0.43 ± 0.21	47%
ASL	–	31.4 ± 9.9	0.91 ± 0.31	34%
CAD-CBF	2 sec	29.0 ± 10.1	0.83 ± 0.29	35%
	3 sec	31.2 ± 9.8	0.90 ± 0.30	33%
	4 sec	32.0 ± 10.1	0.93 ± 0.32	34%
	5 sec	32.0 ± 10.0	0.93 ± 0.31	33%
	6 sec	31.8 ± 10.0	0.92 ± 0.31	32%
	∞	31.4 ± 9.9	0.92 ± 0.31	32%
DSC scaled by white matter ROI of 22 mL/100 g/min		43.4 ± 7.4	1.29 ± 0.46	36%

^†

All values mean ± standard deviation. Tmax_thresh: Tmax threshold for including voxel in the calculation of the correction factor. CBF ratio = mean MR-based CBF value divided by the mean xeCT CBF value (i.e., for no bias, CBF ratio = 1.0). COV = SD normalized by the mean (for perfect precision, COV = 0%).

Significantly different from xeCT CBF (P < 0.01, paired t test).