Article Figures & Data
Figures
- Fig 1.
A, sagittal orientation image illustrating the planning of the imaging section (1) and the arterial spin-labeling slab (2) parallel to the orbitomeatal angle. B, regions of interest used for quantification of the hemodynamic parameters. In each hemisphere, 2 regions of interests were drawn in the frontal lobe, and 1, in the frontal parietal, parietal occipital, and occipital regions.
- Fig 2.
Measured perfusion images of a 53-year-old man with a unilateral left-sided ICA occlusion. The images show the absolute cerebral blood flow (A), transit time (B), and trailing edge (C) maps. Decreased cerebral blood flow, increased transit time, and increased trailing edge can be appreciated in the left hemisphere.
- Fig 3.
Cerebral blood flow (mean ± SEM) in the regions of the hemisphere ipsi- and contralateral to the occlusion and of the control group. Asterisk indicates P < .05; double asterisks, P < .01, a significant difference between the hemisphere ipsilateral to the ICA occlusion and the control subjects; number sign, a significant (P < .05) difference between the hemisphere contralateral to the ICA occlusion and the control subjects.
- Fig 4.
Transit time and trailing edge time (mean ± SEM) in the regions of the hemisphere ipsi- and contralateral to the occlusion and of the control group. Asterisk indicates P < .05; double asterisks, P < .01, a significant difference between the hemisphere ipsilateral to the ICA occlusion and the control subjects; number sign, a significant (P < .05) asymmetry between the hemisphere contralateral to the ICA occlusion and the control subjects; dagger, a significant (P < .01) difference between the hemisphere ipsi- and contralateral to the ICA occlusion.
Tables
Patient No. Age (yr) Sex Symptoms Side of Occlusion Contralateral Side Collateral Flow Pathways 1 44 F Stroke Right 30% P + L 2 55 M TIA Right – P 3 55 M Stroke Right – A + P 4 48 M TIA Right – A + P + L 5 53 M Stroke Left – A + P 6 65 M Stroke Right – A + L 7 77 M AF Right – A + P 8 56 M TIA Left – A + P 9 47 F Stroke Right – P 10 55 M Stroke Left 90% A + L 11 68 M TIA Left 70% L 12 58 M Stroke Right 30% A 13 53 M TIA Right 30% A + P + L 14 65 M TIA Right – A + L 15 60 M Stroke Left 30% A + P 16 53 M Stroke Right – A + L 17 58 M Stroke Left 50% P + L Note:—TIA indicates transient ischemic attack; AF, amaurosis fugax; A, anterior collateral pathway; P, posterior collateral pathway; L, leptomeningeal vessels; –, no stenosis.
- Table 2:
Hemodynamic values for the hemisphere ipsilateral to the occlusion in patients with (n = 9) and with leptomeningeal collateral vessels
Leptomeningeal Vessels Present No Leptomeningeal Vessels CBF* Transit Time Trailing Edge CBF Transit Time Trailing Edge Anterior frontal 31 ± 9 83 ± 46 2436 ± 275† 31 ± 2 25 ± 15 1648 ± 201 Posterior frontal 29 ± 5† 196 ± 103 2700 ± 469 47 ± 6 85 ± 32 1598 ± 348 Frontal parietal 45 ± 4 228 ± 53 2362 ± 208 52 ± 6 97 ± 76 2103 ± 259 Parietal occipital 41 ± 11 529 ± 163 2089 ± 285 33 ± 10 411 ± 106 2185 ± 271 Occipital 54 ± 13 381 ± 138 1815 ± 128† 47 ± 5 359 ± 94 2388 ± 203 * Cerebral blood flow values are given in milliliters/minute/100 g, and transit and trailing edge times, in milliseconds.
† A statistically significant difference between the patients with and without leptomeningeal vessels (t test, P < .05).
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