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FIG 7. In a, DSLA difference images of the circle of Willis in patient 40, with a 95% stenosis before and after endarterectomy. In b, Signal intensity-time courses in the CS. After intervention, arrival time on the affected side was the same as on that the unaffected side (about 125 ms). Amplitudes were not calibrated; hence, higher signal intensity was not associated with higher blood flow or blood volume in a vessel.
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