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Automatic orbital computed tomography coordinating method and quantitative error evaluation based on signed distance

Guangtao Zhai1, Ziqing Yin2,3, Lunhao Li2,3

  • 1Institute of Image Communication and Network Engineering, Shanghai Jiao Tong University, Shanghai, PR China.

Acta Radiologica (Stockholm, Sweden : 1987)
|April 8, 2020
PubMed
Summary
This summary is machine-generated.

A new automatic calibration method for orbital computed tomography (CT) images was developed. This tool offers accurate and reproducible coordinate system correction for orbital imaging, improving diagnostic capabilities.

Keywords:
Orbital computed tomographyautomatic coordinationquantitative evaluationsigned distance field

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Area of Science:

  • Medical Imaging
  • Radiology
  • Computational Anatomy

Background:

  • Orbital computed tomography (CT) is vital for diagnosing orbital diseases but faces challenges with scanning time, radiation, and patient positioning.
  • Manual calibration methods for orbital CT lack reproducibility and objective error evaluation.
  • Coordinate system correction is essential for accurate orbital imaging analysis and computer-assisted surgery.

Purpose of the Study:

  • To develop an automated method for calibrating orbital CT images.
  • To implement a quantitative system for evaluating calibration errors.

Main Methods:

  • A standard 3D orbit model was adjusted and optimized using skull-bound bounding box and mutual information registration.
  • Calibration error was calculated using the signed distance field.
  • Seventeen orbital CT cases were quantitatively assessed.

Main Results:

  • An automated orbital CT calibration and quantitative error evaluation method was successfully established.
  • The calibrated models showed an error of ±2 mm in 81.61% ± 6.91% of cases.
  • An error of ±1 mm was observed in 53.49% ± 7.07% of the total models.

Conclusions:

  • The developed tool facilitates convenient automatic calibration for orbital CT.
  • Automated operation and minimal error promote the adoption of this tool for quantitative orbital CT research.
  • The quantitative error evaluation system can be applied to other coordinate systems.