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 double-resonance structure 10 for DNP-NMR and/or ENDOR experiments is described. The double-resonance structure 10 comprises a microwave resonator 30 for generating electromagnetic field suitable for EPR, and an HF resonator 12 for generating electromagnetic fields suitable for NMR. The HF resonator 12 comprises a plurality of electrically conductive strips 14, which are electrically connected so that an HF current can be generated in the plurality of strips 14 such that the HF currents flow in the same direction in the individual strips 14 at the same time. A section of the HF resonator 12 at the same time forms a part of the microwave resonator 30.

Abstract: A double-resonance structure for DNP-NMR experiments and/or ENDOR experiments and methods using such a double-resonance structure. The double-resonance structure comprises a microwave resonator for generating electromagnetic fields suitable for EPR and an HF resonator for generating electromagnetic fields suitable for NMR. The HF resonator is formed by a strip resonator, a section of the strip resonator at the same time forming a portion of the microwave resonator.

Abstract: A double-resonance structure 10 for DNP-NMR and/or ENDOR experiments is described. The double-resonance structure 10 comprises a microwave resonator 30 for generating electromagnetic fields suitable for EPR, and an HF resonator 12 for generating electromagnetic fields suitable for NMR. The HF resonator 12 comprises a plurality of electrically conductive strips 14, which are electrically connected so that an HF current can be generated in the plurality of strips 14 such that the HF currents flow in the same direction in the individual strips 14 at the same time. A section of the HF resonator 12 at the same time forms a part of the microwave resonator 30.

Abstract: A double-resonance structure for DNP-NMR experiments and/or ENDOR experiments and methods using such a double-resonance structure. The double-resonance structure comprises a microwave resonator for generating electromagnetic fields suitable for EPR and an HF resonator for generating electromagnetic fields suitable for NMR. The HF resonator is formed by a strip resonator, a section of the strip resonator at the same time forming a portion of the microwave resonator.