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Related Experiment Video

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Opportunistic Screening With CT: Comparison of Phantomless BMD Calibration Methods.

Stefan Bartenschlager1,2, Alexander Cavallaro3, Tobias Pogarell3

  • 1Department of Medicine 3, Friedrich-Alexander-University Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|September 21, 2023
PubMed
Summary

Phantomless calibration methods for bone mineral density (BMD) show promise for opportunistic osteoporosis screening using computed tomography (CT) scans. Precalibration is crucial for accurate BMD assessment without a calibration phantom.

Keywords:
BONE MINERAL DENSITY; PERFORMANCE OF PHANTOMLESS CALIBRATIONOPPORTUNISTIC SCREENINGSIMULTANEOUS CALIBRATION

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Area of Science:

  • Radiology and Imaging
  • Osteoporosis Research
  • Medical Physics

Background:

  • Opportunistic screening for osteoporotic fracture risk utilizes computed tomography (CT) scans not originally intended for osteoporosis assessment.
  • Traditional bone mineral density (BMD) quantification requires a calibration phantom, which is often missing in retrospectively analyzed CT scans.
  • Phantomless calibration techniques have been developed as an alternative for BMD estimation in CT imaging.

Purpose of the Study:

  • To review the principles of four existing phantomless calibration methods for CT-based BMD assessment.
  • To compare the performance of these phantomless methods against the gold standard of simultaneous calibration (ΔBMD).
  • To evaluate the effectiveness of phantomless calibration with and without precalibration using a reference dataset.

Main Methods:

  • Four phantomless calibration methods were applied to two datasets: a standardized CT protocol dataset (DS1, n=350) and a clinical routine dataset (DS2, n=114).
  • Three methods required precalibration with a reference dataset containing a calibration phantom, selecting optimal internal reference materials (air, blood, adipose tissue, cortical bone).
  • A fifth method, based on average calibration parameters from the reference dataset, was also applied. Performance was assessed using ΔBMD.

Main Results:

  • Phantomless methods requiring precalibration demonstrated good performance, with ΔBMD ranging from 0.1 ± 2.7 mg/cm³ to 2.4 ± 3.5 mg/cm³ in DS1.
  • These precalibrated methods showed similar means but significantly higher standard deviations in the more variable DS2 dataset.
  • The phantomless method without precalibration performed significantly worse, with ΔBMD values of 12.6 ± 13.2 mg/cm³ (DS1) and 0.5 ± 8.8 mg/cm³ (DS2).

Conclusions:

  • Phantomless BMD calibration is effective for opportunistic screening when precalibrated with a reference dataset.
  • Precalibration significantly improves the accuracy and reliability of phantomless BMD measurements from CT scans.
  • These findings support the potential of phantomless calibration for widespread adoption in clinical practice for osteoporosis risk assessment.