1 From the Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, N-14, W-5, Kita-ku, Sapporo 060-8638, Japan (R.M., D.A., T.H., T.S., B.T., N.K., T.Y.); Department of Diagnostic Imaging (R.M., K.K.), Center for Cause of Death Investigation (T.H.), and Global Center for Biomedical Science and Engineering (K.K.), Faculty of Medicine, Hokkaido University, Sapporo, Japan; and Department of Radiology, Hakodate Municipal Hospital, Hakodate, Japan (Y.Y.).