Evaluation of Compton gamma camera prototype based on pixelated CdTe detectors.

Area of Science:

• Medical Physics
• Nuclear Instrumentation
• Detector Technology

Background:

• Compton cameras are crucial for medical imaging, offering advantages over traditional systems.
• Pixelated semiconductor detectors, like cadmium telluride (CdTe), are promising for advanced imaging devices.
• Simulation is essential for evaluating new detector designs before laboratory implementation.

Purpose of the Study:

• To simulate and evaluate a novel Compton camera prototype based on pixelated CdTe detectors.
• To establish the feasibility and predict the performance of the proposed camera in laboratory settings.
• To assess the operational range and image reconstruction capabilities of the system.

Main Methods:

• A Compton camera prototype was designed using a 2x4 array of pixelated CdTe detectors (2 mm thickness).
• The detectors were stacked to form a 3D detector with 2x1x2 mm^3 voxel sizes.
• Geant4-based Architecture for Medicine-Oriented Simulations (GAMOS) and the Origin Ensemble (OE) algorithm were used for simulation and image reconstruction.

Main Results:

• The simulated camera operates efficiently up to 10^4 Bq, saturating at 10^9 Bq.
• An intrinsic efficiency of 0.4 counts/sec/kBq was achieved with a simulated 18F point source.
• Spatial resolution showed a Full Width at Half Maximum (FWHM) of 1.5 mm, enabling distinction of points 3 mm apart.

Conclusions:

• The simulated pixelated CdTe Compton camera prototype demonstrates feasibility for laboratory testing.
• The system exhibits suitable efficiency and spatial resolution for potential medical imaging applications.
• Further laboratory validation is recommended to confirm the simulated performance characteristics.