First-generation clinical dual-source photon-counting CT: ultra-low-dose quantitative spectral imaging
Leening P Liu1,2, Nadav Shapira3, Andrew A Chen4,5
1Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA. leening@seas.upenn.edu.
European Radiology
|June 16, 2022
Summary
Photon-counting CT (PCCT) offers precise Hounsfield unit measurements at ultra-low radiation doses, outperforming dual-energy CT (DECT) by reducing electronic noise. This advancement benefits quantification and imaging for obese patients.
Area of Science:
- Medical Imaging
- Radiology
- Computed Tomography
Background:
- Dual-source dual-energy CT (DECT) is a standard imaging technique.
- Photon-counting computed tomography (PCCT) is an emerging technology with potential advantages.
- Evaluating PCCT performance at low radiation doses is crucial for clinical adoption.
Purpose of the Study:
- To compare image characteristics of a first-generation dual-source PCCT with a DECT scanner at ultra-low radiation doses.
- To assess the precision and repeatability of Hounsfield unit (HU) measurements.
- To evaluate the impact of electronic background noise reduction.
Main Methods:
- Phantom imaging with and without an extension ring on both PCCT and DECT scanners.
- Acquisition at various radiation dose levels (0.4–15.0 mGy) and spectral settings.
- Characterization of Hounsfield units and image noise on virtual mono-energetic images.
Main Results:
- PCCT demonstrated high precision in HU measurements across a wide range of radiation doses.
- PCCT outperformed DECT at low radiation exposures.
- PCCT significantly reduced electronic background noise by 74% compared to DECT (70/Sn150 kVp) and 60% compared to DECT (100/Sn150 kVp).
Conclusions:
- First clinical experiences with dual-source PCCT show reliable HU values.
- PCCT effectively removes electronic background noise, even at ultra-low doses.
- PCCT offers diagnostic benefits for ultra-low-dose quantification and imaging of obese patients.
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