Computerized axial tomography (CAT) - definition
usually referred to as a CAT or CT scan, computerized axial tomography uses x-ray technology to produce three-dimensional images of bodily structures. This can provide structural information about the brain, although it is of a lower resolution than magnetic resonance imaging (MRI).
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2-Minute Neuroscience: Neuroimaging
CAT scan of the human head. Image courtesy of Andrew Ciscel.