Although MRI is very common for medical applications, MRM is still developing in laboratories up to resonance frequencies of 1000 MHz[1] (for nuclear magnetic resonance; electron magnetic resonance commonly operates at much higher frequencies).
While Magnetic Resonance Imaging (MRI) is frequently employed in medical settings, Magnetic Resonance Microscopy (MRM) is still being developed in labs, reaching frequencies up to 1000 MHz [1] (electron magnetic resonance typically operates at even higher frequencies).