As the ultrahigh-speed OCT acquisition has continuously been extended, there followed an increasing demand for real-time volumetric visualization of OCT data to explore the full potential of the technology, such as intraoperative OCT6 and functional OCT.7,8 However, due to the complexity of OCT data processing and extremely high data throughput, processing interferometric fringe data into images requires significant computational resources, and to date has been far slower than the acquisition rate. Although ultrahigh-speed OCT is capable of acquiring volumetric data in real-time, nearly all of the OCT systems render the three-dimensional (3-D) images in post-processing which greatly limits the range of applications. Several attempts have been made to accelerate the OCT data processing and volume rendering utilizing graphics processing units (GPUs) and field-programmable gate array, including Refs. 8–15, just to name a few. A GPU-based approach for volume rendering was presented at a reduced volume size at 5 frames per second (fps),13 but high resolution, video rate, real-time volumetric rendering has not yet been realized.