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Choroidal nevi classification using swept source optical coherence tomography and infrared reflectance patterns at different wavelengths
Author(s) -
Papastefanou V.,
VázquezAlfageme C.,
DegliEsposti S.,
Cohen V.M.L.,
Patel P.,
Sagoo M.S.
Publication year - 2016
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2016.0402
Subject(s) - optical coherence tomography , reflectivity , materials science , near infrared spectroscopy , medicine , ophthalmology , wavelength , optics , optoelectronics , physics
Purpose Retrospective observational study attempting a classification of choroidal nevi according to the different reflectivity patterns on SS‐OCT and examining the differences on infrared imaging at two wavelengths (830 and 1050 nm) among categories. Methods OCT and infrared images were obtained on 110 clinically diagnosed choroidal nevi from 108 different patients with two different devices: Spectralis SD‐OCT(Heidelberg) at 830 nm and Atlantis DRI SS‐OCT(Topcon) at 1,050 nm. Based on the reflectivity pattern displayed on SS‐OCT, the lesions were classified by a single grader into: Type A (high reflectivity with optical shadowing), type B (medium reflectivity with partial visualization of scleral boundary) and type C (homogeneous hyporeflectivity with visualization of scleral boundary). Infrared images of the lesions at 830 nm (NIR) and 1,050 nm (IR‐SS) were classified into hyper, iso or hyporeflective. Results 110 choroidal nevi were classified as follows: 51 (46.4%) as type A, 19 (17.3%) as type B and 30 (27.3%) as type C. 10 lesions (9%) did not fall into either category. In type A, 48 lesions (94%) displayed low reflectance on IR‐SS, but hypereflectivity on NIR. In type B 13(68%) were hypereflective on NIR and iso or hyporeflective on IR‐SS. In type C 28 lesions (93%) were iso or highly reflective on IR‐SS and also iso or highly reflective on NIR. Conclusions SS‐OCT allows visualization of the choroidal anatomy and characterization of choroidal nevi into three distinct patterns according to the reflectivity displayed. The reflectance pattern on infrared image was drastically different between the two different wavelengths across the OCT patterns. Type A and B showed opposite reflectance patterns between the two devices, while type C displayed similar hypereflectivity.