. Author manuscript; available in PMC: 2017 Jul 18.

Published in final edited form as: Magn Reson Med. 2016 Feb 28;77(3):1142–1150. doi: 10.1002/mrm.26201

Table 1.

Comparison of Segment-Based Evaluations Between SPACE and IR-SPACE^a

				C4	M1	M2	M3	A1	A2	P1	P2
		All	Basilar	ICA	MCA	MCA	MCA	ACA	ACA	PCA	PCA
Vessel wall delineation	SPACE	2.63 (0.49)	3.00 (0.00)	3.00 (0.00)	2.79 (0.39)	2.71 (0.49)	2.64 (0.48)	2.50 (0.50)	2.21 (0.57)	2.57 (0.53)	2.29 (0.49)
	IR-SPACE	2.81 (0.43)	2.86 (0.38)	3.00 (0.00)	3.00 (0.00)	2.93 (0.19)	2.71 (0.49)	2.79 (0.39)	2.43 (0.79)	2.86 (0.38)	2.71 (0.49)
	P value	0.010	0.317	1.000	0.180	0.180	0.655	0.194	0.579	0.157	0.083
Sharpness (mm⁻¹)	SPACE	0.77 (0.52)	1.62 (0.90)	0.94 (0.33)	0.70 (0.29)	0.55 (0.23)	0.57 (0.31)	0.71 (0.29)	0.47 (0.33)	0.74 (0.31)	0.63 (0.39)
	IR-SPACE	1.03 (0.48)	1.63 (0.65)	1.26 (0.44)	1.04 (0.41)	0.91 (0.53)	1.23 (0.61)	0.87 (0.31)	0.74 (0.17)	0.82 (0.26)	0.83 (0.16)
	P value	<0.001	0.946	0.041	0.035	0.038	0.033	0.139	0.074	0.235	0.220

Vessel wall delineation scores (0: ≤ 50% of the vessel wall is visible; 1: > 50% of the vessel wall is visible; 2: the vessel wall is delineated with adequate signal and contrast to the lumen and CSF; and 3: the vessel wall is delineated with excellent SNR and sharp contrast to the lumen and CSF) averaged over the two readers are analyzed using a paired two-tailed Wilcoxon signed rank test. Vessel wall sharpness is analyzed using a paired two-tailed Student’s t-test. Statistical significance (P < 0.05) is indicated with a bold font. Standard deviations are shown in parentheses.

Note: ICA, internal carotid artery; MCA, middle cerebral artery; ACA, anterior cerebral artery; and PCA, posterior cerebral artery.