A preclinical PET detector constructed with a monolithic scintillator ring.

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Detector Physics

Background:

• Preclinical positron emission tomography (PET) requires high-resolution detectors for accurate imaging.
• Existing PET detector designs face limitations in spatial resolution and efficiency.
• Monolithic scintillator rings (MSR) offer a potential solution for improved PET detector performance.

Purpose of the Study:

• To design and characterize a novel preclinical PET detector utilizing a monolithic scintillator ring (MSR).
• To evaluate the spatial decoding accuracy and energy resolution of the MSR detector.
• To assess the imaging capabilities of the MSR detector using a standard phantom.

Main Methods:

• Construction of an MSR detector with silicon photomultipliers (SiPMs).
• Utilized center of gravity (COG) and artificial neural network (ANN) methods for position decoding.
• Employed a tungsten collimator and a precision platform to assess directional decoding accuracy.
• Evaluated energy resolution and phantom imaging performance using 18F-FDG.

Main Results:

• Achieved average intrinsic decoding accuracies with full-width half-maximums (FWHMs) of 0.94 mm (circumferential) and 2.45 mm (axial).
• Measured mean absolute errors (MAEs) of 0.33 mm (circumferential) and 1.08 mm (axial).
• Demonstrated an energy resolution of 10.7% at 511 keV and resolved structures down to 1.2 mm in phantom imaging.

Conclusions:

• The developed MSR detector exhibits high spatial resolution and good energy performance.
• The MSR detector design is feasible for constructing high-performance preclinical PET scanners.
• This technology holds promise for advancing small-animal imaging in research settings.