Using SUV as a guide to 18F-FDG dose reduction

Area of Science:

• Nuclear Medicine
• Radiochemistry
• Medical Imaging

Background:

• Standardized uptake values (SUVs) are crucial for comparing PET scan results.
• Reducing the injected dose of 18F-FDG (fluorodeoxyglucose) is desirable for patient safety and cost-effectiveness.
• SUV measurements can vary with acquisition time, impacting comparability.

Purpose of the Study:

• To develop a method for lowering the injected 18F-FDG dose in PET imaging.
• To maintain the validity of standardized uptake value (SUV) comparisons between studies.
• To establish an algorithm for optimizing acquisition times and reducing administered radiotracer dose.

Main Methods:

• PET datasets were acquired at various time points (30-180 seconds per bed position).
• SUV measurements were normalized to 180-second acquisition values to create stabilization factors.
• Statistical analysis (2-sided F test) compared variances at different time points.

Main Results:

• Variance in SUV data decreased with longer acquisition times.
• SUV stabilization was observed for sufficiently long acquisition periods.
• A predictable trend of SUV stabilization over time was demonstrated.

Conclusions:

• An algorithm was developed to determine the maximum reduction in 18F-FDG dose.
• The proposed algorithm preserves the validity of SUV comparisons.
• This approach facilitates dose reduction in PET imaging without compromising data integrity.