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Abstract
Neruoimaging methods can be conveniently divided into
structural and functional. Structural imaging, such as X-Ray,
CT, or MRI illuminate structures in a static way. While
functional neuroimaging including fMRI, MRS, PET and
SPECT yields metabolic or biochemical information that
allows localization of a neural function.
CT images depend on passage of highly collimated X-ray
beam that passes through the patient’s head and then is
recorded by CT detectors. The image produced depends on the
degree of X-ray attenuation.
One can think simplistically of MRI in terms of energy
exchange between an external magnetic field and certain
atomic nuclei.