1Institute of Medical Engineering, Technische Universitt Mnchen, Garching, Germany; 2Chemistry, Technische Universitt Mnchen, Garching, Germany; 3GE Global Research, Garching, Germany; 4Institute of Radiology, Klinikum rechts der Isar, Technische Universitt Mnchen, Mnchen, Germany; 5Institute of Nuclear Medicine, Klinikum rechts der Isar, Technische Universitt Mnchen, Mnchen, Germany
Real-time in-vivo studies of energy metabolism can be realized through 13C MRSI of hyperpolarized pyruvate and its metabolites. Simultaneously, tumor perfusion can independently be investigated by the injection of hyperpolarized urea, whereas cell necrosis can be studied by the production of malate from hyperpolarized fumarate. We compared the perfusion information given by hyperpolarized [1,4-13C2]fumarate, [1-13C]pyruvate and [13C, 15N2]urea in a group of five rats exhibiting HCC before and after TAE. We have shown that hyperpolarized urea, pyruvate and fumarate all provide consistent information on tumor perfusion. This was quantified by calculating the structural similarity index between images of different substances.