1. Copyright © 2001 American Medical Association. All rights reserved.
From: Towards Visualization of Symptomatic Carotid Stenosis
Arch Neurol. 2001;58(4): doi: /archneur
Figure Legend:
A, Contrast-enhanced magnetic resonance (MR) angiography reveals high-grade proximal internal carotid artery (ICA) stenosis (arrow) with signal void at the level of the right carotid bifurcation. B, Power Doppler shows excellent delineation of the stenosis (arrow) and increased blood-flow velocity (yellow and red) at the site of ICA stenosis. C, Color Doppler flow imaging demonstrates high-grade ICA stenosis (arrow) with turbulent flow (light blue). D, The T2-weighted MR image shows bilateral periventricular lesions and signs of slight atrophy (enlarged lateral ventricle and sulcal widening) and slight hyperintensity in the parenchyma supplied by the right middle cerebral artery (MCA) (ellipsoid). This may indicate asymptomatic chronic ischemic tissue changes probably due to long-standing hemodynamic compromise in the MCA territory.
Date of download: 10/29/2017
Copyright © 2001 American Medical Association. All rights reserved.

2. Copyright © 2001 American Medical Association. All rights reserved.
From: Towards Visualization of Symptomatic Carotid Stenosis
Arch Neurol. 2001;58(4): doi: /archneur
Figure Legend:
A, Perfusion-weighted magnetic resonance imaging (MRI) (free induction decay; time to repeat (TR), 2000 milliseconds; echo time [TE], 65 milliseconds; 40 acquisitions) demonstrates a delay of the contrast bolus arrival on calculated time-to-peak maps indicating hemodynamic compromise in the right middle cerebral artery (MCA) territory due to the proximal stenosis. The delay of contrast bolus arrival appears most pronounced in the area of the new lesion (on diffusion-weighted MRI). B, Isotropic diffusion-weighted MRI (echo planar spin echo; TR, 3000 milliseconds; TE, 110 milliseconds; b = 1000 s/mm2) shows a small area of acute infarction (arrow) in the posterior border zone of the MCA territory.
Date of download: 10/29/2017
Copyright © 2001 American Medical Association. All rights reserved.