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A novel vector field analysis for quantitative structure changes after macular epiretinal membrane surgery.

Seok Hyun Bae1,2, Sojung Go1, Jooyoung Kim1

  • 1Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 173-82 Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13620, South Korea.

Scientific Reports
|April 8, 2024
PubMed
Summary

This study introduces a novel vector field analysis to quantify retinal displacement after epiretinal membrane (ERM) removal. The analysis reveals that retinal structural changes are concentrated early post-surgery and predominantly shift nasally.

Keywords:
Epiretinal membraneFundus photoPostoperativeVector field analysis

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Epiretinal membrane (ERM) removal is a common surgical procedure.
  • Accurate measurement of retinal displacement post-ERM surgery is crucial for assessing outcomes.
  • Existing methods for quantifying retinal changes may lack precision or scalability.

Purpose of the Study:

  • To introduce a novel vector field analysis for quantitative measurement of retinal displacement after epiretinal membrane (ERM) removal.
  • To develop and validate a computational framework for analyzing retinal structural changes using fundus images.
  • To assess the temporal and directional patterns of retinal displacement following ERM surgery.

Main Methods:

  • Developed a framework involving rigid and non-rigid image registration of preoperative and postoperative retinal fundus images.
  • Utilized retinal vessel segmentation masks for precise non-rigid registration.
  • Calculated pixel-wise vector fields representing retinal displacement and standardized results into 24 sectors.
  • Applied the method to 20 patients, analyzing displacement at multiple postoperative time points (1, 4, 10, and 22 months).

Main Results:

  • The mean direction of retinal displacement vectors was consistently nasal.
  • Mean standardized magnitudes of retinal displacement decreased over time: 38.6 (pre- to 1 month post-op), 14.9 (1 to 4 months), 7.6 (4 to 10 months), and 5.4 (10 to 22 months).
  • Significant retinal structural changes were observed primarily in the early postoperative period.

Conclusions:

  • The proposed vector field analysis offers a computerized, reproducible, and scalable method for analyzing retinal structural changes.
  • The technique provides a powerful visualization tool for understanding postoperative retinal dynamics.
  • Retinal displacement after ERM removal is most pronounced early on and shows a nasal migratory trend.