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Editors Selection IGR 16-2
Clinical Examination Methods: Spectral Domain and Swept-Source OCT
Comment by Atusya Miki on:
65935 REAL-TIME FULL-DEPTH VISUALIZATION OF POSTERIOR OCULAR STRUCTURES: Comparison Between Full-Depth Imaging Spectral Domain Optical Coherence Tomography and Swept-Source Optical Coherence Tomography, Barteselli G; Bartsch DU; Weinreb RN et al., Retina (Philadelphia, Pa.), 2016; 36: 1153-1161
Retinal imaging with optical coherence tomography (OCT) plays an integral part in the diagnosis and management of retinal pathologies and glaucoma. Spectral-domain OCT (SD-OCT), which is the most extensively used modality, allows an excellent visualization of retinal pathologies. In addition to retinal imaging, imaging of shallower (the vitreous body and the vitreo-retinal interface) and deeper (the choroid and the lamina cribrosa) structures using enhanced depth imaging (EDI) or swept-source OCT (SS-OCT) has been extensively studied and reported, with the increasing recognition of the importance of these structures in the pathogenesis of various ocular disorders.
In this manuscript, Barteselli and colleagues introduced full depth imaging (FDI), a new OCT imaging technique. FDI is basically a combination of EDI and standard SD-OCT, which takes full advantage of these techniques to visualize both superficial and deep structures. The authors compared the visualization of vitreoretino-choroidal structures between FDI and SS-OCT in 40 healthy eyes, 40 eyes with macular pathologies, and 40 eyes with glaucoma. FDI offered better visualization of the vitreous body and similar visualization of the retina and the choroid compared with SS-OCT. FDI has the advantage of offering full depth (from the vitreous body to the choroid) imaging of the posterior pole with a standard SD-OCT device. When compared with SS-OCT, FDI is potentially disadvantageous in that it is technically more demanding, is unable to produce 3D image, and offers shorter scan length. Despite these limitations, FDI is a promising alternative. It has been recognized that assessment of preretinal structures in retino-choroidal disorders such as macular degeneration as well as assessment of retino-choroidal structures in preretinal pathologies such as epiretinal membrane (ERM) is important for predicting visual outcome. Therefore, simultaneous visualization of both superficial (vitreous) and deep (choroid) structures by novel FDI SD-OCT technique has a potential of improving our knowledge and clinical practice of various macular disorders.
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