1. Department of Electrical and Electronics Engineering Bilkent University Ankara 06800 Turkey
2. National Magnetic Resonance Research Center (UMRAM) Bilkent University Ankara 06800 Turkey
3. Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 USA
4. Center for Magnetic Resonance Research University of Minnesota Minneapolis MN 55455 USA
5. Neuroscience Program Aysel Sabuncu Brain Research Center Bilkent University Ankara 06800 Turkey