Multi-divergent-beam stationary cardiac SPECT

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Biomedical Engineering

Background:

• Multi-pinhole single photon emission computed tomography (SPECT) is a key technology for small animal imaging.
• Recent applications of multi-pinhole SPECT in human cardiac imaging have enabled stationary systems using three cameras.
• Stationary systems necessitate an image reduction mode, positioning the object away from the pinholes.

Purpose of the Study:

• To evaluate collimator designs for stationary cardiac SPECT systems operating in image reduction mode.
• To compare the sensitivity of divergent-beam collimators versus pinhole collimators under identical reduction factors and spatial resolution.

Main Methods:

• Investigated the performance of multi-divergent-hole collimators in a stationary cardiac SPECT setup.
• Compared sensitivity metrics between divergent-beam and pinhole collimators at a specific image reduction factor and spatial resolution.

Main Results:

• Divergent-beam collimators demonstrate superior sensitivity compared to pinhole collimators.
• This advantage holds true when both collimator types share the same image reduction factor and spatial resolution.

Conclusions:

• For stationary cardiac SPECT systems utilizing image reduction mode, multi-divergent-hole collimators are recommended.
• The proposed multi-divergent-hole collimator design offers enhanced sensitivity for improved cardiac SPECT imaging.