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Related Experiment Videos

Software upgrading in a CT scanner. Influence on quantitative CT

J A Kalef-Ezra1, A H Karantanas

  • 1Medical Physics Department, Medical School, University of Ioannina, Greece.

Acta Radiologica (Stockholm, Sweden : 1987)
|November 1, 1996
PubMed
Summary

CT scanner software upgrades impact density measurements. New software improved precision but altered density values and kVp influence, necessitating conversion factors for accurate patient data.

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Area of Science:

  • Medical Imaging
  • Radiological Physics

Background:

  • Computed Tomography (CT) scanners are crucial for diagnostic imaging.
  • Software updates aim to enhance scanner performance, including field uniformity and CT number stability.

Purpose of the Study:

  • To evaluate the impact of a CT scanner software upgrade on density measurements.
  • To assess changes in CT number stability and precision post-upgrade.

Main Methods:

  • A European spinal torso phantom with vertebrae of varying densities was utilized.
  • Density measurements were taken before and after the software upgrade.

Main Results:

  • The software upgrade led to improved short-term precision in density measurements.
  • Density values increased at 80 and 100 kVp but decreased at 130 kVp.

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  • The influence of kilovoltage peak (kVp) on density values became more pronounced.

    • Conclusions:

    • Density measurements are affected by CT scanner software upgrades.
    • Conversion factors are recommended for density values in reference populations and patient follow-up studies to account for software-induced changes.