NMR imaging produces no observable mutations or cytotoxicity in mammalian cells

Abstract
Chinese hamster ovary [CHO] cells in culture were exposed to the radiofrequency fields and the static and changing magnetic fields associated with NMR imaging. After a 24 h exposure, no cytotoxicity was observed and the frequency of 6-thioguanine-resistant mutants was unaffected. At exposures that greatly exceed those that might be used in a clinical situation, NMR imaging caused no detectable genetic (mutational) damage and did not affect cell viability.