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TO Muldoon, PT Garcia, RB Rosen, JP S Garcia, JB Walsh, JC Nieto; OCT Retinal Imaging: OCT Ophthalmoscope versus Humphrey OCT . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4368.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose:To compare the retinal imaging capabilities of the Optical Coherent Tomography Ophthalmoscope (OCT Ophthalmoscope) and the Humphrey Optical Coherent Tomogram (Humphrey OCT). Methods:Patients with a variety of retinal pathologies were imaged using the OCT Ophthalmoscope (University of Kent, Canterbury; UK for OTI, Toronto, Canada) and Humphrey OCT (Zeiss, Germany). Systems were compared as to ease of image acquisition, as well as amount of information derived from the scans. Results:The Humphrey OCT is the gold standard imaging device for cross-sectional (longitudinal) imaging of the retina for several years now. With its near-histological resolution, this device has been proven to be a useful adjunct especially for macular diagnostics. The OCT Ophthalmoscope, a new imaging device, could perform cross-sectional OCT imaging with a wider scanning field and better resolution compared to the Humphrey OCT. In addition, it could perform multi-depth coronal sections (C scans) with good image resolution. Because of this, details missed by the Humphrey OCT were easily picked up with the OCT Ophthalmoscope. It could also generate three-dimensional views of the retina, with a point-by-point correspondence to the confocal image. In its current configuration, the OCT Ophthalmoscope is limited by a relatively slow scan rate of 1.5 hertz, a shallow depth of focus that does not allow focusing of both anterior and posterior surfaces of thick lesions and a difficulty in imaging patients with high refractive errors. Conclusion:The OCT Ophthalmoscope is a promising new approach to OCT imaging of the retina. Its superior resolution, coronal scanning strategy and three-dimensional capabilities, are distinct advantages over currently available commercial systems. Further development of the technique will be required to realize its clinical potential.
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