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A conformal TOF-DOI Prism-PET prototype scanner for high-resolution quantitative neuroimaging.
Xinjie Zeng1,2, Zipai Wang1,3, Wanbin Tan1,3
1Department of Radiology, Weill Cornell Medical College, Cornell University, New York, New York, USA.
Medical Physics
|January 18, 2023
Summary
This study introduces Prism-PET, a novel brain scanner offering ultra-high resolution for Positron Emission Tomography (PET) imaging. It significantly reduces partial volume effects, enabling accurate quantification in small brain regions for better neurological disease diagnosis.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Biomedical Engineering
Background:
- Positron Emission Tomography (PET) is vital in oncology and neurology.
- Low spatial resolution limits PET's potential, causing partial volume effects (PVE).
- Accurate quantitative PET imaging is hindered by PVE in small structures.
Purpose of the Study:
- To present experimental results of an ultra-high resolution, brain-dedicated PET scanner.
- To demonstrate the Prism-PET scanner's ability to reduce PVE.
- To show accurate radiotracer uptake quantification in small brain regions.
Main Methods:
- A compact, decagon-shaped prototype scanner with 40 Prism-PET detector modules.
- Each module uses LYSO scintillator crystals and silicon photomultiplier (SiPM) pixels.
- Performance evaluated via DOI, energy, timing, spatial resolution, sensitivity, and phantom imaging.
Main Results:
- Achieved 2.85 mm DOI resolution, 12.6% energy resolution, and 271 ps timing resolution.
- Intrinsic spatial resolution of 0.89-mm FWHM; average reconstructed spatial resolution of 1.53-mm FWHM.
- Demonstrated 1.00-mm hot-rod reconstruction and accurate quantification in 2-3 mm brain regions.
Conclusions:
- Prism-PET significantly enhances quantitative PET utility in neurology.
- Improves early diagnosis of neurodegenerative diseases.
- Aids in managing primary and metastatic brain tumors.
