Image reconstruction algorithm for a spinning strip CZT SPECT camera with a parallel slat collimator and small pixels

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Detector Physics

Background:

• Conventional single photon emission computed tomography (SPECT) systems utilize cadmium zinc telluride (CdZnTe) detectors with parallel slat collimators.
• Existing designs often have limitations in spatial resolution and data acquisition efficiency.

Purpose of the Study:

• To investigate the performance of a novel SPECT camera design employing smaller detector pixels.
• To evaluate the impact of pixel size reduction on spatial resolution and photon detection efficiency in CdZnTe SPECT systems.

Main Methods:

• Computer simulations were performed to model the small-pixel configuration.
• Phantom experiments were conducted to validate simulation results and assess real-world performance.
• The proposed design utilizes halved pixel sizes within a standard parallel slat collimator setup.

Main Results:

• The small-pixel configuration demonstrated potential for enhanced spatial resolution compared to conventional designs.
• Photon counts were maintained at similar levels despite the reduction in pixel size.
• The new design requires only 180-degree rotation per SPECT view, unlike older designs needing 360 degrees.

Conclusions:

• Reducing pixel size in CdZnTe SPECT cameras offers a promising method to improve spatial resolution.
• This approach maintains photon detection efficiency while simplifying data acquisition protocols.
• The findings suggest a significant advancement for SPECT imaging technology.