Article Figures & Data
Tables
Parameter Time Resolved Bolus Timing TR (ms) 4 6 TE (ms) 1.65 2.16 Flip angle (degrees) 25 30 Slab thickness (mm) 64 70 Number of partitions 64 80 Field of view (mm) 300 300 Pixel size (mm) 2.13 × 1.17 1.17 × 0.59 Pixel matrix 88 × 256 160 × 512 Acquisition time (s) 9 30.98 - TABLE 2:
Comparison of estimates of internal carotid artery stenoses with contrast-enhanced MR angiography versus DSA
Percentage Stenosis with MR Angiography Percentage Stenosis with DSA 0–29 30–69 70–99 100 0–29 64 12 — — 30–69 7 30 7 — 70–99 3 27 122 — 100 — — — 12 Note.—Numbers are pooled data (4 observers × 71 vessels = 284 evaluations).
- TABLE 3:
Results for detecting a 70–99% stenosis with contrast-enhanced MR angiography and duplex sonography
Parameter MR Angiography (n = 4 × 71) Sonography (n = 71) Sensitivity (%)* 94.9 (91–100) 92.9 (91–94) Specificity (%)* 79.1 (76–84) 81.9 (74–86) False-negative† 7 (2.5) 10 (3.5) False-positive† 30 (10.6) 26 (9.2) * Numbers in parentheses are 95% confidence intervals.
† Data are number (%) of evaluations.
- TABLE 4:
Comparison of estimates of internal carotid artery stenosis with duplex sonography versus DSA
Percentage Stenosis with Sonography Percentage Stenosis with DSA 0–29 30–69 70–99 100 0–29 56 8 — — 30–69 18 36 10 — 70–99 — 26 118 — 100 — — — 12 Note.—Numbers are pooled data (4 observers × 71 vessels = 284 evaluations).
- TABLE 5:
Results for detecting a 70–99% stenosis in 227 cases (79.9%) with concordant grading with contrast-enhanced MR angiography and duplex sonography
Parameter Value Sensitivity 100 (100) Specificity 81.4 (80–89) False-negative 0 False-positive 8.4 Note.—Data are percentages. Numbers in parentheses are 95% confidence intervals.
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