Functional PET for mapping metabolic dynamics in Parkinson's disease

Area of Science:

• Neuroscience
• Nuclear Medicine
• Radiology

Background:

• Static [18F]-FDG PET shows Parkinson's disease (PD) metabolic patterns.
• Static PET provides limited insight into synaptic activity dynamics.
• Dynamic PET offers a more comprehensive view of glucose metabolism.

Purpose of the Study:

• To map metabolic dynamics in PD using dynamic constant infusion PET and MRI.
• To investigate metabolic network activity on an individual level in PD patients.
• To establish a foundation for temporal molecular imaging in neurodegenerative diseases.

Main Methods:

• Utilized a novel dynamic constant infusion [18F]-FDG PET protocol.
• Integrated MRI for enhanced anatomical and metabolic mapping.
• Analyzed metabolic time series and temporal variations.

Main Results:

• Identified hypometabolism in bilateral substantia nigra clusters in PD patients (p<0.001).
• Depicted individual-level metabolic networks within basal ganglia and resting-state networks.
• Observed region-specific increases in time series variation linked to cognitive PD symptoms.

Conclusions:

• The dynamic PET protocol effectively evaluates metabolic dynamics and network activity in PD.
• Findings support the application of temporal molecular imaging for neurodegenerative diseases.
• Further evaluation in prodromal stages is warranted to capture early metabolic changes.