From what i can see on the site below - you can peel or explore the various levels of the body by using the mouse or tools on the page -
http://www.imaios.com/en/e-Anatomy/H...e-and-neck-MRI

It looks like C7 itself is pretty far from the carotid artery but the vertebral artery runs right thru all of the verts. Occasionally there are variances in our bodies so the imaging should help to show if that is a possible factor.