Imaging agents for magnetic resonance imaging are disclosed. Also disclosed are methods of non-invasively generating a visible image of a target tissue. In some embodiments, the discloses methods include the steps of (a) providing a contrast enhancement agent comprising a small molecule that binds to a biomolecule present in the target tissue; (b) introducing the contrast enhancement agent into the target tissue; and (c) scanning the target tissue using magnetic resonance imaging, whereby a visible image of the target tissue is non-invasively generated. Further discloses are methods for monitoring a response to a therapy, methods for selecting a therapy for a subject, methods for delineating a boundary between a diseased cell and a non-diseased cell in a tissue, and methods for assessing the degree to which a target tissue has been removed from a subject.