[The advantages and limitations of brain function analyses by PET]

Area of Science:

• Neuroscience
• Medical Imaging
• Brain Function Analysis

Background:

• Positron Emission Tomography (PET) is a powerful tool for exploring brain function.
• Functional imaging techniques provide insights into brain pathophysiology.
• Understanding brain dysfunction requires analyzing multiple physiological parameters.

Purpose of the Study:

• To discuss the advantages and limitations of PET for analyzing brain function.
• To explore the precise pathophysiology of brain dysfunction using multimodality PET.
• To investigate the role of neurotransmitter function in specific neuronal dysfunctions.

Main Methods:

• Multimodality PET studies measuring cerebral energy metabolism (CMRO2, CMRglc), cerebral blood flow (CBF), and oxygen extraction fraction (OEF).
• Assessment of presynaptic and postsynaptic neurotransmitter function.
• Analysis of clinical and experimental experiences in functional imaging.

Main Results:

• PET reveals distinct perfusion states in cerebral infarction: "misery perfusion" (acute), "luxury perfusion" (intermediate), and decreased CBF/CMRO2 (chronic).
• Neurotransmitter function can identify specific neuronal subgroups involved in dysfunction.
• Experimental studies indicate potential uncoupling between neuronal activity and energy metabolism/CBF in certain pathologies.

Conclusions:

• PET provides valuable insights into brain pathophysiology, particularly in cerebral infarction.
• Neurotransmitter PET imaging holds promise for understanding drug effects and developing new therapies for brain diseases.
• Limitations in temporal resolution necessitate careful interpretation of PET findings regarding neuronal activity propagation.