Carotid Artery Stenosis: Comparison of 3D Time-of-Flight MR Angiography and Contrast-Enhanced MR Angiography at 3T

Figure 1

Forty-nine-year-old male patient with high-grade asymptomatic stenosis of the right external carotid artery detected with ultrasonography. While a filiform stenosis is seen on the contrast enhanced images (white arrow), the lumen of the right internal carotid artery is not seen on TOF images and the finding was interpreted as occlusion (red arrow). (a) Axial reformat of the subtracted contrast-enhanced MR angiography (CEMRA), (b) maximum intensity projection (MIP) of the CEMRA dataset, (c) axial time-of-flight (TOF) MR angiography image, and (d) MIP of the TOF MRA dataset. The much smaller axial field-of-view of the TOF MRA is clearly seen on the MIP images.