Positron emission tomography (PET) is a brain imaging technique used to study the metabolic activities of different brain cells associated with the processing of brain functions.
The rs-fMRI (resting state- functional magnetic resonance imaging) measures changes in oxygen or iron when an individual does not engage in a particular task (during rest).
The resting state images taken in PET and rs-fMRI are helpful to detect the abnormal brain functions. The rs-fMRI can also detect the functional connections in the brain during the resting state.