[1] Univ So Calif, Magnet Resonance Engn Lab, Ming Hsieh Dept Elect Engn, Viterbi Sch Engn, Los Angeles, CA 90089 USA
[2] Univ So Calif, Keck Sch Med, Dept Radiol, Los Angeles, CA 90033 USA
[3] Univ So Calif, Keck Sch Med, Dept Prevent Med, Los Angeles, CA 90033 USA
[4] Univ So Calif, Keck Sch Med, Dept Physiol & Biophys, Los Angeles, CA 90033 USA
[5] Univ So Calif, Keck Sch Med, Dept Pediat, Los Angeles, CA 90033 USA