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There is a need for non-invasive diagnostic tools to detect and monitor the occurrence of diseases. Ideally, this can be done without resorting to ionizing radiation, especially when multiple rounds of imaging are required. Magnetic resonance imaging (MRI), a form of threedimensional nuclear magnetic resonance, has become a common tool of choice for diagnosticians. Due to the low contrast difference between healthy and diseased tissue, contrast agents—magnetic species administered to the patient prior to imaging—are routinely used for contrast improvement. High-field (B0! 4.7 T, 1H Larmor frequency! 200 MHz) MRI offers advantages in terms of better signal-to-noise ratio, as well as improved spectral resolution for certain applications. New contrast agents are being developed for high-field MRI, the topic of this review. After discussing the purpose of contrast agents and the advantages and potential issues of …