Centiloids in Amyloid PET: A Practical Guide to Quantitation Interpretation

Area of Science:

• Nuclear medicine
• Neuroimaging
• Alzheimer disease research

Background:

• Amyloid PET imaging is crucial for diagnosing Alzheimer disease.
• Disease-modifying therapies necessitate objective measures for baseline and treatment response assessment.
• Visual interpretation of amyloid PET has limitations in borderline cases and subtle change detection.

Purpose of the Study:

• To explain the principles of quantitative amyloid PET.
• To detail the Centiloid scale for standardized amyloid PET quantification.
• To discuss the role of quantitative amyloid PET in therapy monitoring and clinical decision-making.

Main Methods:

• Review of amyloid PET quantification principles.
• Explanation of Centiloid scale origin and interpretation.
• Discussion of clinical utility in Alzheimer disease management.

Main Results:

• Quantitative amyloid PET, including z scores, SUV ratios, and Centiloid scaling, offers objective measures.
• The Centiloid scale standardizes amyloid PET across different tracers, scanners, and institutions.
• Quantitative methods complement visual assessment and improve consistency.

Conclusions:

• Quantitative amyloid PET, particularly Centiloid scaling, is essential for baseline characterization and longitudinal monitoring of antiamyloid therapies.
• Standardized quantification aids consistent interpretation and comparison, crucial for clinical decision-making.
• Nuclear medicine professionals must understand quantitative amyloid PET for effective Alzheimer disease management.