sentence: Scientists try to use the highest possible magnetic fields to get the best image quality.
sentences_before: A key idea of NMR is that the resonance frequency of a particular substance is directly proportional to the strength of the applied magnetic field. This resonance is used in imaging techniques. If a sample is placed in a non-uniform magnetic field then the resonance frequencies of the sample's nuclei depend on where in the field they are located.
concept_name: scientist
headings: Nuclear magnetic resonance How it works
categories: Nuclear physics