Power Doppler Imaging: initial evaluation as a screening examination for carotid artery stenosis. - Bluth,E.I.; Sunshine,J.H.; Lyons,J.B.; Beam,C.A.; Troxclair,L.A.; Althans-Kopecky,L.; Crewson,P.E.; Sullivan,M.A.; Smetherman,D.A.; Heidenreich,P.A.; Neiman,H.L.; Burkhardt,J.H. (Radiology, 2000)