PET scanning is of particular value in elucidating the relationships between cerebral blood flow, oxygen utilisation and extraction in focal areas of ischaemia or infarction (page 237) and has been used to study patients with dementia, epilepsy and brain tumours. Identification of neurotransmitter and drug receptor sites has aided the understanding and management of psychiatric (schizophrenia) and movement disorders.
PET scan several days after a left middle cerebral infarct showing a reduction in blood flow--.
Oxygen utilisation is also reduced with a slight increase in oxygen extraction
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