Abstract: A hyperpolarized liquid contrast agent is for use in a MRT device. The liquid contrast agent passes through a conduit of a MW resonator in the magnetic field of the MRT device. A microwave with a frequency of at least 40 GHz couples into the MW resonator for polarizing the liquid contrast agent upon passage through the conduit in the MW resonator using DNP. The contrast agent is polarized in a continuous passage in the MW resonator and administered immediately. A MW mode is formed in the MW resonator which has an antinode in the magnetic field strength and a node in the electric field strength. The power of the introduced microwave and coupling of the microwave into the resonator are adjusted such that in the area of the line, an amplitude of the MW magnetic field strength B 1 ? 1.5 · 10 - 2 ? Ts ? 1 T 1 , e results, wherein T1,e is the relaxation time of the DNP-active electrons.

Abstract: A method of measuring magnetic resonance properties of an object, which includes a thermally polarized substance and a contrast agent exhibiting a nuclear magnetic resonance (NMR) antiphase signal (A), comprises the steps of subjecting the object in a stationary magnetic field to an excitation sequence including excitation radio frequency pulses, collecting NMR signals generated in the object including a background signal (B) generated by the thermally polarized substance and the antiphase signal (A) generated by the contrast agent, and reconstructing the magnetic resonance properties of the object based on the NMR signals, wherein the NMR signals are collected during the occurrence of the antiphase signal (A) and with a time delay relative to a maximum of the background signal (B). Furthermore, a measuring device for measuring magnetic resonance properties of an object, like an NMR spectrometer or an MRI device, is described.