1Dept of Cell Physiology and metabolism, University of Geneva, Geneva, Switzerland, 2Dept of Biomedical Engineering, Imperial College, London, United Kingdom, 3Animal Imaging and Technology CIBM-AIT, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, 4Laboratory of functional and metabolic imaging LIFMET, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, 5Radiology, University of Lausanne, Lausanne, Switzerland, 6Radiology, University of Geneva, Geneva, Switzerland