Abstract
The real-time display of full-range, , Fourier-domain optical- coherence tomography (FD-OCT) images is demonstrated. The required speed was achieved by using dual graphic processing units (GPUs) with many stream processors to realize highly parallel processing. We used a zero-filling technique, including a forward Fourier transform, a zero padding to increase the axial data-array size to 8192, an inverse-Fourier transform back to the spectral domain, a linear interpolation from wavelength to wavenumber, a lateral Hilbert transform to obtain the complex spectrum, a Fourier transform to obtain the axial profiles, and a log scaling. The data-transfer time of the frame grabber was , and the processing time, which includes the data transfer between the GPU memory and the host computer, was , for a total time shorter than the frame-interval time using a line-scan CCD camera operated at . That is, our OCT system achieved a processed-image display rate of 27.23 frames/s.
© 2010 Optical Society of America
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