  We demonstrate swept-source optical coherence tomography in real-time by high
throughput digital Fresnel hologram rendering from optically-acquired
interferograms with a high-speed camera. The interferogram stream is spatially
rescaled with respect to wavelength to compensate for field-of-view dilation
inherent to discrete Fresnel transformation. Holograms are calculated from an
input stream of 16-bit, 1024-by-1024-pixel interferograms recorded at up to 512
frames per second with a digital camera. All calculations are performed by a
NVIDIA TITAN Xp graphics card on single-precision floating-point complex-valued
arrays (32-bit per quadrature). It allows sustained computation of
1024-by-1024-by-256-voxel volumes at 10 billion voxel/s, from which three
perpendicular cuts are displayed in real-time at user-selected locations, up to
38 frames per second.
