Ultrahigh-Speed Spectral-Domain Optical Coherence Tomography Up To 1-Mhz A-Scan Rate Using Space-Time-Division Multiplexing
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT(2021)
摘要
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 x 250 x 2048 pixels (9 x 4.5 x 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.
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关键词
Fourier optical signal processing, parallel processing, space-time-division multiplexing (STDM), spectral-domain optical coherence tomography (OCT), ultrahigh-speed imaging system
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