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Methods for Post Hoc Quantitative Computed Tomography Bone Density Calibration: Phantom-Only and Regression.

Jacob M Reeves1, Nikolas K Knowles2, George S Athwal3

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Post hoc calibration for quantitative computed tomography (qCT) bone density can be achieved using CT settings. Regression analysis shows peak tube voltage predicts calibration terms, offering an alternative when calibration phantoms are missing.

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Area of Science:

  • Radiological imaging
  • Medical physics
  • Bone densitometry

Background:

  • Quantitative computed tomography (qCT) requires accurate bone mineral density (BMD) calibration.
  • Absence of a calibration phantom necessitates post hoc calibration methods.
  • CT settings may influence BMD estimations, suggesting potential for predictive calibration.

Purpose of the Study:

  • To compare a novel CT setting regression method for post hoc qCT calibration against standard and phantom-only methods.
  • To determine if calibration equation terms can be predicted using CT parameters like peak tube voltage and current.

Main Methods:

  • Five cadaveric upper limbs were scanned using 11 peak tube voltage and current combinations.
  • Density calibrations were performed using standard, post hoc phantom-only, and CT setting regression methods.
  • Stepwise linear regression analyzed the correlation between CT settings and calibration equation terms.

Main Results:

  • Peak tube voltage, but not current, significantly correlated with regression calibration terms.
  • Calibration equation slope was influenced by phantom type, calibration method, and peak tube voltage.
  • Calibration equation intercept was significantly related to phantom type and peak tube voltage.

Conclusions:

  • Regression analysis can effectively correlate peak tube voltage with qCT density calibration terms.
  • CT setting regression offers a viable post hoc calibration method when standard calibration is not feasible.
  • While standard qCT calibration remains preferable, regression calibration provides an acceptable alternative.