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. 2020 Mar;40(3):499-506.
doi: 10.1097/IAE.0000000000002452.

SWEPT-SOURCE AND SPECTRAL DOMAIN OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY VERSUS DYE ANGIOGRAPHY IN THE MEASUREMENT OF TYPE 1 NEOVASCULARIZATION

Maria Vittoria Cicinelli  1 , Michele Cavalleri  1 , Andrea Celestino Consorte  1 , Alessandro Rabiolo  1 , Riccardo Sacconi  1   2 , Francesco Bandello  1 , Giuseppe Querques  1
Affiliations

SWEPT-SOURCE AND SPECTRAL DOMAIN OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY VERSUS DYE ANGIOGRAPHY IN THE MEASUREMENT OF TYPE 1 NEOVASCULARIZATION

Maria Vittoria Cicinelli et al. Retina. 2020 Mar.

Abstract

Purpose: To compare the area of Type 1 neovascularization in patients with age-related macular degeneration calculated on spectral domain optical coherence tomography angiography (SD-OCTA), swept-source OCTA, and indocyanine green angiography (ICGA).

Methods: Cross-sectional study enrolling patients with neovascular age-related macular degeneration with Type 1 neovascularization. During the same visit, ICGA (Spectralis HRA, Heidelberg, Germany), 3 × 3-mm or 6 × 6-mm SD-OCTA (CIRRUS AngioPlex model 5000; Carl Zeiss Meditec, Inc, Dublin, OH), and 3 × 3-mm or 6 × 6-mm swept-source OCTA (Plex Elite 9000; Carl Zeiss Meditec, Inc) were performed. Neovascularization areas were compared among the three instruments. The degree of consistency between measurements was investigated through the two-way mixed intraclass correlation, whereas the intermethod agreement was expressed by the Bland-Altman analysis. Mean difference and 95% confidence intervals are provided.

Results: Eighteen eyes of 14 white patients (10 females, 83.3%) were included in the study. The neovascularization area measured on ICGA was higher compared to that measured on both SD-OCTA (P = 0.008) and swept-source OCTA (P = 0.008), whereas no differences were found between the two OCTA. Similar results were achieved analyzing 3 × 3-mm and 6 × 6-mm scan separately. Lowest reliability resulted from the ICGA versus SD-OCTA pair (intraclass correlation = 0.786, confidence interval = 0.500-0.915). Spectral domain OCTA and swept-source OCTA exhibited an excellent agreement (mean difference = 0.2). Swept-source OCTA offered qualitatively better images of the neovascularization, compared with SD-OCTA.

Conclusion: Better visualization of the extent of neovascularization is obtained using SS-OCT or SD-OCT compared with ICGA, which may be influenced by choroidal permeability and dye leakage. Neovascularization area on OCTA may become an objective parameter in the follow-up of age-related macular degeneration patients, along with traditional imaging techniques.

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