Pneumoencephalography: A historic neuroimaging technique based on temporarily replacing cerebrospinal fluid with a contrast agent (often simply air) to allow for sufficient soft-tissue contrast when imaging the brain with x rays; mainly used to evaluate the size of the brain ventricles which are enlarged in some neuropsychiatric diseases, e.g. in schizophrenia.
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- Neuroimaging : A group of techniques used to visualize structure and function of nervous systems, especially the vertebrate brain.
- Brain ventricle : A space in the brain that is filled with cerebrospinal fluid.
- X-ray : An ionizing type of electromagnetic radiation whose absorption or diffraction often used for structural investigations of matter.