Department of Chemistry, Umeå University, Umeå, Sweden. tommy.oman@ltu.se.|MI Lab, Department of Circulation and Medical Imaging, Norwegian University of Science and Technology (NTNU), Trondheim, Norway. may-britt.tessem@ntnu.no.|MI Lab, Department of Circulation and Medical Imaging, Norwegian University of Science and Technology (NTNU), Trondheim, Norway. tone.f.bathen@ntnu.no.|Department of Urology, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway. helena.bertilsson@ntnu.no.|Department of Urology, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway. anders.angelsen@ntnu.no.|Department of Chemistry, Umeå University, Umeå, Sweden. mattias.hedenstrom@chem.umu.se.|MR Core Facility, Department of Circulation and Medical Imaging, NTNU, Trondheim, Norway. trygve.andreassen@ntnu.no.