A high resolution and high detection efficiency depth-encoding detector for brain positron emission tomography based...

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Detector Physics

Background:

• Positron Emission Tomography (PET) requires high accuracy and precision for quantitative brain studies.
• Dedicated brain PET scanners with uniform high resolution and sensitivity are essential.
• Depth-of-Interaction (DOI) encoding detectors offer a promising approach to improve PET performance.

Purpose of the Study:

• To evaluate the performance of a novel DOI PET detector for brain imaging applications.
• To assess the impact of temperature on detector performance.
• To determine the energy, DOI, and timing resolution of the developed detector.

Main Methods:

• A PET detector was constructed using two 16x16 arrays of SiPMs and a 44x44 array of 0.69x0.69x30 mm^3 LYSO crystals.
• Detector performance was evaluated at various temperatures (-9°C, 0°C, 10°C, 20°C).
• Flood histograms were analyzed to assess crystal element identification and performance metrics.

Main Results:

• All crystal elements were resolvable in flood histograms, with some edge crystal limitations due to light sharing.
• Average energy resolution was 21.1 ± 3.0%.
• Average DOI resolution was 3.47 ± 0.17 mm, and average timing resolution was 1.38 ± 0.09 ns at 0°C.

Conclusions:

• The evaluated DOI PET detector shows potential for improving quantitative accuracy and precision in brain PET imaging.
• Optimal performance was achieved at 0°C, indicating temperature sensitivity.
• The detector's resolutions are promising for advanced brain PET applications.