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MRI-based 3D retinal shape determination.

Luc van Vught1,2, Denis P Shamonin3, Gregorius P M Luyten1

  • 1Department of Ophthalmology, Leiden University Medical Center, Leiden, The Netherlands.

BMJ Open Ophthalmology
|December 13, 2021
PubMed
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This summary is machine-generated.

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This study presents a novel three-dimensional (3D) method using magnetic resonance imaging (MRI) to accurately determine retinal shape. The developed technique is reproducible and offers 2D alternatives for ophthalmology applications.

Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Accurate measurement of retinal shape is crucial for understanding ocular diseases.
  • Conventional two-dimensional (2D) methods may not fully capture the complex 3D geometry of the retina.

Purpose of the Study:

  • To develop and validate a robust method for determining the three-dimensional (3D) retinal shape using magnetic resonance imaging (MRI).
  • To assess the reproducibility of this 3D retinal shape determination method.
  • To compare the 3D method with existing 2D techniques.

Main Methods:

  • High-resolution ocular MRI was performed on 31 volunteers.
  • 3D MR images were segmented, and ellipsoids were fitted to the retinal contours.
  • Ellipsoid fitting was tested on varying fractions of the retinal contour to assess parameter dependency.
Keywords:
eye (Globe)imagingoptics and refractionretina

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  • Reproducibility was evaluated in four subjects, and comparisons with 2D methods were conducted.

    • Main Results:

    • The 3D ellipsoidal model demonstrated high accuracy, with mean distances of 0.03±0.01 mm (central) and 0.13±0.03 mm (peripheral) from the segmented retina.
    • Specific radii and posterior shifts were quantified for central and peripheral retinal ellipsoids.
    • The method showed good reproducibility, with errors of 0.3±1.2 mm (central) and 0.0±0.1 mm (peripheral).
    • Comparison with 2D methods showed minimal differences in fitted radii for the peripheral retina.

    Conclusions:

    • A precise and reproducible method for 3D retinal shape determination using MRI has been established.
    • The study provides 3D ellipsoidal models and validated 2D alternatives.
    • This technique is expected to facilitate wider application in ophthalmological research and clinical practice.