Novel NMR/MRI Modalities: Radiation-free NMR and MRI and Quadrupolar MRI A. Jerschow Department of Chemistry, New York University, New York, NY 10003 NMR spectroscopy and magnetic resonance imaging (MRI) rely on the application of radiofrequency (rf) irradiation in combination with a static magnetic field. Rf irradiation may lead to heating and other, yet unknown bioeffects. Spin-noise detection does not require any form of rf irradiation, the availability of strong magnetic fields, nor large population differences between the nuclear spin states.