1. From the Institute of Medical Physics (A.M., O.M., K.E.) and Department of Medicine 3 (K.E.), University Hospital, Friedrich-Alexander University Erlangen-Nuremberg, Henkestr 91, Erlangen 91052, Germany; and Department of Radiology, AP-HP, Hôpital Lariboisière and Université Paris Diderot, Paris, France (V.B., P.P., J.D.L.).