1. From the Biomedical Imaging Research Institute, Department of Biomedical Sciences (A.K., I.C., R.L.Q.T., H.-J.Y., B.S., D.L., R.D.) and Cedars-Sinai Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA (E.M., D.L., D. S. B., R.D.); Department of Bioengineering (A.K., H.-J.Y.) and Department of Medicine, David Geffen School of Medicine (D. S. B., R.D.), University of California, Los Angeles, CA; and Department of Radiology, Northwestern University, Chicago, IL (A.K., R.L.Q.T., D.L., R.D.).