Article Figures & Data
Figures
- Fig 1.
Bland-Altman plot shows excellent depiction of intracranial stenosis of the horizontal segments (A), vertical segments (B), anterior circulation (C), and posterior circulation (D) by IV FDCT with DSA as the reference. Length discrepancy (IV FDCT–DSA, in millimeters) was found more often in higher stenosis but was not statistically significant (E, Spearman rank correlation test; r = − 0.12, P = .13).
- Fig 2.
An 81-year-old woman who underwent coil embolization of an unruptured posterior communicating artery aneurysm 1 month before was referred due to a history of progressive left hemiparesis. A and B, Good concordance was obtained for depicting stenosis at the proximal (arrows) and distal (arrowheads) M2 segment between DSA and IV FDCT. C and D, Axial maximum-intensity-projection image of IV FDCT allows a clear delineation of the vascular lumen from circumferential calcification (arrows) without superimposition of bone (arrowheads).
- Fig 3.
A 70-year-old woman was transferred for right-sided hemiparesis. A, Anteroposterior DSA of the left internal carotid artery shows severe stenosis (76.2%) at the left M1 segment (D-stenosis) with the beginning point of M1 (D-normal) as a reference point. B, Selective maximum-intensity-projection image of IV FDCT reveals excellent concordance of severe stenosis (76.9%) at the left M1 segment (arrows) with DSA as a reference.
- Fig 4.
A 55-year-old man was transferred to the emergency department for right-sided hemiparesis. A, Time-of-flight MRA reveals severe stenosis at the left M1 segment (arrow). B, Selective maximum-intensity-projection image of IV FDCT shows 40% stenosis at the left M1 segment (arrow) with excellent concordance to the DSA reference. C, Anteroposterior DSA of the left internal carotid artery illustrates 40% stenosis at the left M1 segment (arrow).
Tables
Stenosis ICA A1 M1 M2 P1 BA V4 Total 30%–49% 4 11 19 6 2 7 7 56 50%–69% 5 7 17 2 2 9 5 47 70%–99% 4 7 13 2 0 6 5 37 Complete occlusion 2 0 6 1 0 0 0 9 Total 15 25 55 11 4 22 17 149 Note:—BA indicates basilar artery.
Seen on DSA Not Seen on DSA Total Seen on IV FDCT 34 2 36 Not seen on IV FDCT 3 110 113 Total 37 112 149 ↵a The numbers given are vessel segments.
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