Comparison of High-Resolution MR Imaging and Digital Subtraction Angiography for the Characterization and Diagnosis of Intracranial Artery Disease

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Fig 1.
Measurements of the degree of stenosis and minimal luminal diameter in both DSA and HR-MR. The degree of stenosis is 73.9% on HR-MR (normal luminal diameter, 3.18 mm; minimal luminal diameter, 0.83 mm) and 72.7% on DSA (normal luminal diameter, 2.86 mm; minimal luminal diameter, 0.78 mm).

Table 1:

Comparison of the degree of stenosis and the minimal luminal diameter

↵a Data indicate the mean ± SD.
↵b There were no significant differences between DSA and HR-MR (P > .05).
↵c There were significant differences between DSA and HR-MR (P < .05).
↵d Agreement refers to the interclass correlation coefficients between DSA and HR-MR, and data in parentheses indicate 95% confidence intervals.
↵e Agreement refers to the κ values between DSA and HR-MR, and data in parentheses indicate 95% confidence intervals.
↵f Correlation refers to the Spearman R values between DSA and HR-MR.

Table 2:

Interobserver and intermodality diagnostic agreement

	Diagnostic Agreement^{^a}	Agreement Ratio^{^b}	Disagreement Ratio^{^b}	Undetermined Diagnosis^{^c}
DSA^{^d}	0.643 (0.458–0.828)	73.0% (27/37)	27.0% (10/27)	5.41 %/16.22 %
HR-MR^{^d}	0.818 (0.670–0.966)	86.5% (32/37)	13.5% (5/37)	2.70 %/5.41 %
Observer 1^{^e}	0.704 (0.528–0.881)	78.4% (29/37)	21.6% (8/37)
Observer 2^{^e}	0.579 (0.390–0.768)	67.6% (25/37)	32.4% (12/37)

↵a Agreement refers to κ values between DSA and HR-MR, and data in parentheses indicate 95% confidence intervals.
↵b Data in parentheses indicate the numbers of agreed or disagreed cases compared with the total number of cases in the diagnosis.
↵c The proportions of undetermined diagnosis for observer 1/observer 2.
↵d Interobserver agreement between observer 1 and observer 2.
↵e Intermodality agreement between DSA and HR-MR.