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Updated: Aug 1, 2025
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High-Resolution Cardiac Positron Emission Tomography/Computed Tomography for Small Animals
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Simulation Study of High-sensitivity Cardiac-dedicated PET Systems with Different Geometries
Go Akamatsu1, Hideaki Tashima1, Yuma Iwao1
1National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology (NIRS-QST), Chiba, Japan.
Annals of Nuclear Cardiology
|May 1, 2023
Summary
New compact PET scanner designs, the elliptical and D-shape geometries, show promise for improved cardiac imaging. These dedicated systems offer higher sensitivity and lower noise for detecting coronary artery disease compared to standard scanners.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Biomedical Engineering
Background:
- Positron Emission Tomography (PET) is crucial for noninvasive myocardial blood flow quantification in coronary artery disease (CAD).
- Standard cylindrical PET scanners, optimized for whole-body imaging, are suboptimal for dedicated cardiac applications.
- There is a need for specialized PET systems to enhance cardiac imaging performance.
Purpose of the Study:
- To propose and evaluate novel compact geometries (elliptical and D-shape) for cardiac-dedicated PET systems.
- To compare the performance of these compact geometries against a standard whole-body cylindrical PET geometry.
- To assess sensitivity, noise-equivalent count rate (NECR), image noise, and contrast recovery.
Main Methods:
- Utilized Geant4 Monte Carlo simulations to model PET scanner geometries and performance.
- Simulated scans of an elliptical water phantom to determine sensitivity and NECR.
- Reconstructed coincidence data from a digital chest phantom to evaluate image noise and contrast recovery.
Main Results:
- Proposed compact geometries demonstrated higher sensitivity than the whole-body geometry.
- The D-shape geometry exhibited a 47% increase in NECR and a 44% reduction in image noise.
- Contrast recovery in hot regions was lower with compact geometries compared to the whole-body system.
Conclusions:
- Elliptical and D-shape geometries are promising for developing high-sensitivity, cost-effective cardiac PET systems.
- These compact designs offer significant improvements in NECR and image noise.
- Further investigation with defect phantoms is needed to assess cold area contrast recovery.
