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Lens distortion in optically coupled digital x-ray imaging.

H Liu1, H Jiang, L L Fajardo

  • 1Department of Radiology and Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland 21205, USA. hliu@jhim.edu

Medical Physics
|June 7, 2000
PubMed
Summary

This study presents an algorithm to correct geometrical distortions from relay lenses in digital x-ray imaging systems. The developed method significantly reduces positional errors, improving image accuracy for quantitative analysis.

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Area of Science:

  • Medical Imaging
  • Optical Engineering
  • Digital Signal Processing

Background:

  • Optically coupled digital x-ray imaging systems utilize relay lenses, which can introduce geometrical distortions.
  • These distortions affect the accuracy of quantitative measurements in medical imaging.
  • Accurate geometrical representation is crucial for precise diagnostic and analytical purposes.

Purpose of the Study:

  • To analyze geometrical distortions caused by relay lenses in digital x-ray imaging.
  • To develop and validate an algorithm for correcting these lens-induced distortions.
  • To improve the positional accuracy of images acquired using lens-coupled CCD systems.

Main Methods:

  • Experimental measurement of radial and tangential errors using a lens-coupled charge-coupled device (CCD) prototype.

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  • Development of a polynomial transformation algorithm to correct distortions.
  • Calibration using an x-ray image of a standard grid to identify the optical axis and apply corrections.

    • Main Results:

    • Lens distortions were classified and corrected using polynomial transformation.
    • The correction algorithm reduced mean positional error from approximately 8 pixels (0.69 mm) to under 1.8 pixels (0.15 mm).
    • A fourth-order polynomial provided the optimal correction for the investigated lens-CCD prototype.

    Conclusions:

    • Geometrical distortions from relay lenses must be considered in quantitative x-ray imaging.
    • Appropriate algorithms can effectively minimize these distortions in CCD x-ray imaging.
    • The demonstrated algorithm offers a viable solution for enhancing image fidelity in digital radiography.