Renal Blood Flow Quantification in Pigs Using Contrast-Enhanced Ultrasound: An Ex Vivo Study - Hoeffel, C.; Mulé, S.; Huwart, L.; Frouin, F.; Jais, J.-P.; Helenon, O.; Correas, J.-M. (Ultraschall in der Medizin - European Journal of Ultrasound, 2010)