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Figure 6: Color Doppler over 2-D US of the anterolateral neck area at C6/C7 level. While looking only at the 2-D US image, one may confuse vertebral artery (2) with a nerve root. Both may look the same on 2-D US. Color Doppler helps to distinguish nerve roots from blood vessels. 1) Carotid artery; 2) Vertebral artery; 3) Inferior thyroid vein

Figure 6: Color Doppler over 2-D US of the anterolateral neck area at C6/C7 level. While looking only at the 2-D US image, one may confuse vertebral artery (2) with a nerve root. Both may look the same on 2-D US. Color Doppler helps to distinguish nerve roots from blood vessels. 1) Carotid artery; 2) Vertebral artery; 3) Inferior thyroid vein