Abstract
Imaging speed is one of the most important parameters that define the performance of optical coherence tomography (OCT) systems. During the last two decades, OCT speed has increased by over three orders of magnitude. New developments in wavelength-swept lasers have repeatedly been crucial for this development. In this review, we discuss the historical evolution and current state of the art of high-speed OCT systems, with focus on wavelength swept light sources and swept source OCT systems.
Highlights
Fast, ultrafast, megahertzThe first published optical coherence tomography (OCT) scan had an acquisition time of seconds – for a single B-Scan [1]
Imaging speed is one of the most important parameters that define the performance of optical coherence tomography (OCT) systems
We focus on one technology that led to many new records in OCT speed, which is wavelength-swept lasers
Summary
The first published optical coherence tomography (OCT) scan had an acquisition time of seconds – for a single B-Scan [1]. While motorized linear stages where used in the beginning [10], several concepts such as piezocoupled fiber stretchers [11] and galvanometer-based dispersive delay lines [12] levered mechanical motion to get to higher speeds This enabled video-rate OCT for the first time - that is acquisition of two-dimensional images with more than 20-30 frames per second [13]. Other OCT concepts that allow for very high speed, such as line-field and full-field OCT, will only be mentioned briefly Those techniques are not confocal and exhibit different image quality than standard OCT systems. It is currently no fully established in which application scenarios these non-confocal systems may replace standard OCT systems
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