NDLI: Binarization of enhanced depth imaging optical coherence tomographic images of an eye with Wyburn-Mason syndrome: a case report

Content Provider	Springer Nature : BioMed Central
Author	Iwata, Akiko Mitamura, Yoshinori Niki, Masanori Semba, Kentaro Egawa, Mariko Katome, Takashi Sonoda, Shozo Sakamoto, Taiji
Abstract	Background To report a thicker choroid and larger choroidal luminal area in an eye with Wyburn-Mason syndrome. To the best of our knowledge, this is the first report demonstrating an increase in the choroidal thickness and the luminal area in a case of Wyburn-Mason syndrome. In addition, we report the changing appearance of retinal arteriovenous malformations over a 16-year period. Case presentation A 27-year-old woman, who was diagnosed with Wyburn-Mason syndrome at age 11 years, visited our clinic. Her best-corrected visual acuity was 20/12.5 in the right eye and light perception in the left eye. Severely dilated, tortuous vascular loops were distributed from the optic disc over all four quadrants of the left fundus. The vascular loops in some areas were more dilated and tortuous than 16 years earlier. Optical coherence tomography (OCT) showed retinal edema with cystic changes and enlarged choroidal vessel lumens in the left eye. The subfoveal choroidal thickness was manually measured by the caliper function in the enhanced depth imaging OCT (EDI-OCT) images. Binarization of the EDI-OCT images was performed with publicly accessible ImageJ software. The examined area of the subfoveal choroid was 1,500 μm wide, and the dark areas representing the luminal areas were traced by the Niblack method. After determining the distance of each pixel, the luminal area was automatically calculated. The subfoveal choroidal thickness was 250 μm in the right eye and 462 μm in the left eye. The luminal area of the 1,500-μm-wide subfoveal choroid was computed to be 307,165.6 μm2 in the right eye and 545,780.7 μm2 in the left eye. Conclusions The EDI-OCT images showed a thicker choroid, and binarization of the EDI-OCT images showed that the luminal areas were significantly larger in the affected eye, suggesting a dilatation of the choroidal vessels. The results demonstrated that conversion of EDI-OCT images to binary images was a useful method to quantify the choroidal structure.
Related Links	https://bmcophthalmol.biomedcentral.com/counter/pdf/10.1186/s12886-015-0014-2.pdf
Ending Page	5
Page Count	5
Starting Page	1
File Format	HTM / HTML
ISSN	14712415
DOI	10.1186/s12886-015-0014-2
Journal	BMC Ophthalmology
Issue Number	1
Volume Number	15
Language	English
Publisher	BioMed Central
Publisher Date	2015-03-07
Access Restriction	Open
Subject Keyword	Ophthalmology Binarization Choroidal structure Enhanced depth imaging optical coherence tomography Fluorescein angiography Wyburn-Mason syndrome
Content Type	Text
Resource Type	Case study
Subject	Ophthalmology
Journal Impact Factor	1.7/2023
5-Year Journal Impact Factor	2/2023

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