Development of a variable-radius pinhole SPECT system with a portable gamma camera

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Biomedical Engineering

Background:

• Small-animal SPECT imaging is crucial for preclinical research.
• Developing cost-effective and high-resolution systems remains a challenge.

Purpose of the Study:

• To develop a small-animal SPECT system using a low-cost commercial portable gamma camera.
• To optimize sensitivity and resolution through a variable radius system.

Main Methods:

• A portable gamma camera with a pinhole collimator was adapted to a variable radius system.
• Resolution and calibration parameters were assessed at different radii.
• Acquisitions were performed on small phantoms and mice.

Main Results:

• Resolution values of 1.0mm and 1.4mm were achieved at different radii.
• The variable radius system demonstrated its utility for optimizing SPECT performance.
• Satisfactory image quality was obtained for both phantoms and animal subjects.

Conclusions:

• The developed system is useful for small animal SPECT imaging.
• The variable radius approach enhances system flexibility and performance.
• This cost-effective system offers a viable option for preclinical imaging research.