Abstract
The primary optimization of the imaging speed of optical coherence tomography (OCT) has been keenly studied. In order to overcome the major speed limitation of spectral-domain OCT (SD-OCT), we developed an ultrahigh-speed SD-OCT system, with an A-scan rate of up to 1 MHz, using the method of space–time-division multiplexing (STDM). Multicameras comprising a single spectrometer were implemented in the developed ultrahigh-speed STDM method to eliminate the dead time of operation, whereas STDM was simultaneously employed to enable wide-range scanning measurements at a high speed. By successfully integrating the developed STDM method with GPU parallel processing, 8 vol/s for an image range of $250\times 250\times2048$ pixels ( $9\times 4.5\times 5$ mm) was achieved, with an adjustable volume rate according to the required scanning speed and range. The examined STDM-OCT results of the customized optical thin film confirmed its feasibility for various fields that require rapid and wide-field scanning.
Highlights
O PTICAL coherence tomography (OCT) is a noninvasive and high-resolution imaging technique that enables2-D imaging and 3-D imaging to measure morphologicalManuscript received January 27, 2021; revised March 27, 2021; accepted April 6, 2021
We used multicameras in single spectrometer to resolve the existing limitations of the time-division multiplexing (TDM) method, such as alignment errors of each spectrometer, power loss of detected interference signal caused by the use of multiple couplers, and sacrificing the spectral resolution of the camera
The quantitatively analyzed results successfully demonstrate the effective implementation of the space–time-division multiplexing (STDM) method for achieving a 1-MHz A-scan rate
Summary
O PTICAL coherence tomography (OCT) is a noninvasive and high-resolution imaging technique that enables2-D imaging and 3-D imaging to measure morphologicalManuscript received January 27, 2021; revised March 27, 2021; accepted April 6, 2021. O PTICAL coherence tomography (OCT) is a noninvasive and high-resolution imaging technique that enables. Due to the method’s potential resolution merits, OCT has been widely employed in various applications, such as ophthalmology [3], dentistry [4], [5], otolaryngology [6], [7], dermatology [8], [9], and even industrial fields [10], [11]. In terms of imaging speed, the development of high-speed real-time OCT has been required in order to observe morphological time variation of biological tissues with minimal motion artifacts [12], [13] and to fit a limited inspection time in industrial applications [14], [15]
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