1. Laboratory of Magnetic Resonance Microimaging International Tomography Center 630090 Novosibirsk Russia
2. Novosibirsk State University 630090 Novosibirsk Russia
3. Helmholtz Institute Mainz GSI Helmholtzzentrum für Schwerionenforschung GmbH 55128 Mainz Germany
4. Johannes Gutenberg University 55090 Mainz Germany
5. University of California Berkeley Berkeley CA 94720 USA