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Long-term quantitative stability of a first-generation dual-source photon-counting CT.

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Photon-counting CT (PCCT) shows excellent temporal stability over two years, ensuring reliable quantitative imaging for longitudinal studies. This stability enhances diagnostic confidence and expands clinical applications in radiology.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Photon-Counting CT

Background:

  • Photon-counting CT (PCCT) offers high spatial resolution and quantitative capabilities for advanced imaging.
  • Temporal stability of PCCT is crucial for accurate longitudinal studies, distinguishing biological changes from scanner variations.

Purpose of the Study:

  • To assess the temporal stability of a first-generation dual-source PCCT over a two-year period.
  • To evaluate the impact of software/hardware updates on PCCT quantitative accuracy and noise.

Main Methods:

  • A phantom was scanned weekly for two years using single-source and dual-source PCCT modes.
  • Virtual monoenergetic images (VMIs) and iodine density maps were analyzed for changes in relative error and noise.

Main Results:

  • VMIs showed minimal variation (0.03-0.08%) and stable noise levels (max 4 HU) over time, with improvements in dual-source mode post-updates.
  • Iodine density maps remained stable (variation up to 0.1 mg/mL), with enhanced quantification in dual-source mode.
  • Relative error in iodine quantification matched between single-source and dual-source modes after updates (-0.04 and -0.02 mg/mL).

Conclusions:

  • PCCT demonstrates robust temporal stability, crucial for reliable quantitative metrics in longitudinal studies.
  • Improved quantification accuracy, especially in dual-source mode, enhances confidence in diagnostic radiology workflows.
  • The findings support the expanded clinical application of PCCT for precise quantitative imaging.