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Updated: Jun 26, 2026
06:25
Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
Published on: February 12, 2014
Open-Geometry PET: quantifying the trade-off between time-of-flight resolution and angular coverage
Gašper Razdevšek1, Rok Dolenec1,2, Matic Orehar2
1Jožef Stefan Institute, Ljubljana, Slovenia.
Physics in Medicine and Biology
|June 24, 2026
Summary
High time-of-flight (TOF) resolution in open-geometry positron emission tomography (PET) systems significantly reduces artifacts and improves image quality, even with limited angular coverage. Fast TOF performance enables better image reconstruction and design flexibility for next-generation PET scanners.
Area of Science:
- Medical Imaging Physics
- Nuclear Medicine Technology
- Computational Imaging
Background:
- Time-of-flight (TOF) resolution enhances positron emission tomography (PET) by improving event localization, reducing noise, and boosting image quality.
- In open-geometry PET systems, TOF can mitigate issues arising from limited angular sampling, such as geometric distortions and reconstruction artifacts.
Purpose of the Study:
- To quantitatively assess the combined impact of TOF resolution and angular coverage on image quality in open-geometry PET.
- To determine the minimum angular coverage required for high-quality reconstructions at various TOF performance levels.
Main Methods:
- Utilized Monte Carlo simulations with an idealized PET scanner model to isolate TOF and angular sampling effects.
- Evaluated five angular coverages (60°-180°) and six TOF resolutions (25-400 ps FWHM).
- Assessed image quality using point sources, Derenzo phantom, and NEMA phantom, measuring spatial resolution, contrast recovery, background variability, and geometric distortion.
Main Results:
- TOF resolutions below 100 ps are crucial for open-geometry PET, substantially reducing artifacts and improving image quality.
- Fast TOF performance allows image quality to approach that of full-ring systems, even with reduced angular coverage.
- Findings were validated using a realistic Monte Carlo model of the Siemens Biograph Vision PET/CT scanner.
Conclusions:
- Fast TOF resolution is a key factor enabling high-quality imaging in open-geometry PET systems.
- Improved TOF performance can reduce the necessary detector coverage while maintaining excellent image quality.
- This research offers practical design insights for developing advanced open-geometry PET systems.
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