Fig. 1.
Doppler imaging setup for endovascular OCT system. (a) High-speed data acquisition and graphics processing unit (GPU) processor connection to back end of C7-XR OCT system for high density A-line imaging. Clk: k-clock, Trig: A-scan trigger, Ch1: channel for raw OCT signal; DAQ: data acquisition; SSD: solid-state drive. (b) The imaging catheter showing the Doppler angle of the imaging beam, which is variable depending on the position of the guide wire and catheter location. (c) A schematic diagram showing the imaging catheter is not coaxial with the blood vessel. θbf indicates the beam-to-flow angle.