Abstract
The recent transition from time domain (TD) to Fourier domain (FD) detection techniques in optical coherence tomography (OCT) [1] enabled a dramatic improvement in imaging speed, from several hundred lines or depth scans (A-scans) per second in TD-OCT systems up to several 10,000 lines per second for the first fast FD-OCT systems. Fourier domain OCT (FD-OCT) can be implemented either with a swept laser source (SS-OCT) or as a spectrometer based system (SD-OCT) [2-4]. FD-OCT has two advantages compared to the former time domain detection technique, in which a mechanically scanned reference arm was used: First, in FD-OCT the A-line rate is directly given by the read-out speed of the fast line scan camera (in SD-OCT) or by the tuning rate of the wavelength swept laser source (in SS-OCT); usually both can be much higher than the speed of a mechanically scanned delay line. Second, FD detection techniques offer a several hundred times higher detection sensitivity than TD techniques [5-7] and this is the prerequisite to maintain high image quality despite increased imaging speeds.
© 2009 IEEE
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