[Basic Evaluation of Standardized Uptake Value Using SPECT Single Unit to Compare with Specific Binding Ratio in...

Area of Science:

• Nuclear Medicine
• Radiochemistry
• Neuroimaging

Background:

• Specific binding ratio (SBR) is a key quantitative index for dopamine transporter scintigraphy.
• Current SBR calculations use a fixed striatal volume, neglecting individual variations and aging.
• Standardized uptake value (SUV) is an alternative quantitative method in single photon emission computed tomography (SPECT).

Purpose of the Study:

• To compare the quantitative accuracy of SBR and SUV in dopamine transporter imaging.
• To evaluate the diagnostic performance of SBR versus SUV.
• To determine the suitability of SBR for quantitative analysis using SPECT single units.

Main Methods:

• A phantom study using Iodine-123 was conducted to calculate the calibration factor (CF).
• SBR and SUV were calculated and compared using phantom and clinical data (n=16).
• Pearson correlation and receiver operating characteristic (ROC) curve analysis were performed.

Main Results:

• A strong positive correlation (r>0.7) was observed between SBR and SUV in clinical cases.
• Both SBR and SUV showed significant differences between normal and diseased groups (p<0.05).
• SBR demonstrated higher diagnostic accuracy than SUV (AUC=0.875 for SUV).

Conclusions:

• SBR is a suitable and accurate quantitative index for dopamine transporter scintigraphy with SPECT.
• SBR provides a more precise quantitative measure compared to SUV, accounting for individual differences.
• SBR enhances diagnostic accuracy in clinical applications of dopamine transporter imaging.