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Brain imaging refers to the use of various techniques to visualize and understand the structure, function, and connectivity of the brain in vivo. These methods include structural imaging techniques such as computed tomography (CT) and magnetic resonance imaging (MRI), which provide detailed images of the brain's anatomy, and functional imaging techniques such as positron emission tomography (PET) and functional MRI (fMRI), which allow for the measurement of brain activity. Brain imaging plays a critical role in understanding normal brain function as well as identifying and characterizing neurological and psychiatric disorders, making it an essential tool in the field of neuroscience and a vital component of brain function research.