Transjugular intrahepatic portosystemic shunts: improved evaluation with echo-enhanced color-Doppler sonography, power Doppler sonography, and spectral duplex sonography. - Fürst,G.; Malms,J.; Heyer,T.; Saleh,A.; Cohnen,M.; Frieling,T.; Weule,J.; Hofer,M. (AJR Am J Roentgenol, 1998)