Fewer-Angle SPECT/CT Blood Pool Imaging for Infection and Inflammation

Area of Science:

• Nuclear Medicine
• Radiology
• Medical Imaging

Background:

• Standard SPECT/CT blood pool imaging is crucial for diagnosing inflammatory and infectious conditions.
• Longer acquisition times can be a limitation in clinical practice.

Purpose of the Study:

• To evaluate a novel, faster SPECT/CT blood pool imaging protocol (FASpecT/CT) for localizing focal soft-tissue inflammation, infection, and osteomyelitis.
• To assess the diagnostic accuracy and time efficiency of FASpecT/CT compared to standard SPECT/CT.

Main Methods:

• Developed and validated a fewer-angle SPECT/CT (FASpecT/CT) protocol using phantom studies.
• Acquired FASpecT/CT images with a dual-head gamma camera (6 steps, 30s/image, ~3 min total time).
• Reconstructed images using iterative ordered-subset expectation maximization.

Main Results:

• FASpecT/CT provided excellent 3D localization of osteomyelitis, soft-tissue infection, and tendonitis.
• Acquisition time was reduced by 72%-90% compared to standard SPECT/CT (1.3-3.5 min vs. standard times).
• Phantom modeling determined optimal acquisition parameters for reliable imaging.

Conclusions:

• FASpecT/CT blood pool imaging effectively localizes focal hyperemia and inflammation, enhancing diagnostic sensitivity and specificity.
• The protocol significantly decreases imaging time, offering a more efficient diagnostic tool.