Comparison of Clinically Relevant Findings from High-Speed Fourier-Domain and Conventional Time-Domain Optical Coherence Tomography
Accepted 3 March 2009. published online 11 May 2009.
Purpose
To compare the sensitivities of high-speed Fourier-domain optical coherence tomography (FD-OCT) and conventional time-domain (TD) OCT for the detection of clinical findings important in the management of common vitreoretinal disorders.
Design
Prospective, observational study.
Methods
FD-OCT scans (128 B scans × 512 A scans) were obtained using a prototype instrument (3 D-OCT; Topcon, Tokyo, Japan) in 50 eyes of 28 consecutive patients undergoing conventional high-resolution (6 B scans × 512 A scans) TD-OCT imaging (Stratus OCT; Carl Zeiss Meditec, Dublin, California, USA). Each image set was reviewed independently for the presence of clinical findings of interest, and device sensitivities were calculated.
Results
The average sensitivity for detection of all features in this study was 94% for FD-OCT and 60% for TD-OCT. Clinical findings were identical between devices in 18% (9/50) of cases. FD-OCT detected features that were not visible on conventional OCT scans in 78% (39/50) of cases. FD-OCT was more sensitive than TD-OCT for the detection of multiple findings, including diffuse intraretinal edema (87% vs 60.9%), subretinal fluid (100% vs 46.2%), large pigment epithelium detachments (100% vs 81%), and subretinal tissue (100% vs 61.5%).
Conclusions
FD-OCT seems to be superior to TD-OCT for the detection of many clinically relevant features of vitreoretinal disease. The greater sensitivity of FD-OCT systems for the detection of intraretinal and subretinal fluid may be of particular importance for the treatment of patients with neovascular age-related macular edema. FD-OCT is likely to supplant TD-OCT as the standard of care for retinal specialists in the near future.
aDoheny Image Reading Center, Doheny Eye Institute, Keck School of Medicine of the University of Southern California, Los Angeles, California
bDepartment of Ophthalmology, University of Utah, Salt Lake City, Utah
cDepartment of Vitreoretinal Surgery, Center for Ophthalmology, University of Cologne, Cologne, Germany
Inquiries to Alexander C. Walsh, Doheny Eye Institute, 1450 San Pablo Street, Los Angeles, CA 90033
ABSTRACT