[1] CHUM, Dept Radiol, Montreal, PQ, Canada
[2] Univ Montreal, Ctr Hosp, Ctr Rech, CRCHUM, Montreal, PQ, Canada
[3] Univ Montreal, Dept Radiol Radiooncol & Nucl Med, Montreal, PQ, Canada
[4] Univ Montreal, Inst Biomed Engn, Montreal, PQ, Canada
[5] CRCHUM, Lab Biorheol & Med Ultrason, Montreal, PQ, Canada
[6] Univ Calif San Diego, Dept Radiol, Liver Imaging Grp, San Diego, CA 92103 USA