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Quantitative Evaluation of Bone Microstructure using High-Resolution Extremity Cone-Beam CT with a CMOS Detector.

S Subramanian1, M Brehler1, Q Cao1

  • 1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD USA.

Proceedings of Spie--The International Society for Optical Engineering
|December 10, 2019
PubMed
Summary

A new complementary metal-oxide-semiconductor (CMOS) detector significantly improves cone-beam CT (CBCT) for imaging bone microstructure. This advanced system offers faster scans and more accurate measurements of trabecular bone, aiding in the assessment of skeletal health.

Keywords:
CMOSbone microarchitecturecone-beam CThigh-resolutionorthopedic imagingquantitative imaging

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Orthopedics

Background:

  • Current extremity cone-beam CT (CBCT) systems utilize amorphous silicon flat-panel detectors (FPDs).
  • There is a need for higher resolution imaging to accurately quantify trabecular bone microstructure.
  • Osteoporosis and osteoarthritis assessment requires detailed analysis of bone structure.

Purpose of the Study:

  • To evaluate the performance of a novel high-resolution CBCT system employing a custom CMOS detector for extremity imaging.
  • To assess the system's capability in quantifying trabecular microstructure in subchondral bone.
  • To compare the new CMOS-CBCT system against conventional FPD-CBCT and micro-CT for accuracy and speed.

Main Methods:

  • A new CBCT system was developed using a Dalsa Xineos3030 CMOS detector, replacing the standard FPD.
  • The CMOS system offers improved spatial resolution and faster scan times compared to FPD-CBCT.
  • Trabecular core samples from cadaveric tibias were imaged using FPD-CBCT, CMOS-CBCT, and micro-CT for comparison.

Main Results:

  • CMOS-CBCT demonstrated superior delineation of trabecular bone detail compared to FPD-CBCT.
  • Quantitative metrics of bone microstructure (trabecular thickness and spacing) showed better correlation with micro-CT using CMOS-CBCT.
  • Scan time was significantly reduced with CMOS-CBCT (~17 sec) compared to FPD-CBCT (~60 sec).

Conclusions:

  • The prototype CMOS-based extremity CBCT system significantly enhances the quantification of bone microstructure.
  • The system maintains diagnostic capabilities, including weight-bearing imaging, from its FPD-based predecessor.
  • This advanced CBCT platform shows promise for quantitative imaging in skeletal health assessments for conditions like osteoporosis and osteoarthritis.