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Related Experiment Videos

Coronary calcium quantification using various calibration phantoms and scoring thresholds.

Maros Ferencik1, Ashley Ferullo, Stephan Achenbach

  • 1Department of Radiology, Massachusetts General Hospital and Harvard Medical School, 100 Charles River Plaza, Suite 400, Boston, MA 02114, USA. maros_ferencik@hms.harvard.edu

Investigative Radiology
|September 10, 2003
PubMed
Summary

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Mineral mass (MM) measurements reduce variability in coronary calcium scoring using multidetector computed tomography (MDCT). While calibration methods accurately quantify calcium ex vivo, they show systematic differences in subjects, with patient-based calibration potentially accounting better for individual patient characteristics.

Area of Science:

  • Cardiovascular imaging
  • Radiology
  • Medical physics

Background:

  • Coronary artery calcification is a marker of atherosclerosis.
  • Accurate quantification of coronary calcium is crucial for cardiovascular risk assessment.
  • Multidetector computed tomography (MDCT) is widely used for coronary calcium measurement.

Purpose of the Study:

  • To compare the accuracy and variability of coronary calcium measurements using different scoring thresholds and calibration methods with MDCT.
  • To evaluate the performance of mineral mass (MM) quantification against traditional scoring methods.

Main Methods:

  • Ninety-five subjects underwent MDCT scans.
  • Agatston score and volume score were calculated.
  • Mineral mass (MM) was quantified using patient-based and scanner-based calibration methods.

Related Experiment Videos

  • Calibration accuracy was validated with artificial calcium cylinders.

    • Main Results:

    • Both patient-based and scanner-based calibration accurately quantified artificial calcium cylinders.
    • MM measurements showed significantly lower relative differences (59%) compared to Agatston (94%) and volume scores (109%) at 90/130 HU thresholds (P < 0.05).
    • Patient-based and scanner-based calibration yielded systematic differences in MM measurements in subjects (bias: 22%).

    Conclusions:

    • Mineral mass (MM) measurement reduces variability in coronary calcium quantification dependent on scoring thresholds.
    • Calibration methods provide accurate ex vivo calcium quantification but exhibit systematic differences in subjects.
    • Patient-based calibration may offer improved accuracy by considering individual subject size and composition.