  Large-volume optical coherence tomography (OCT)-setups employ scanning
mirrors and suffer from non-linear geometric distortion artifacts in which the
degree of distortion is determined by the maximum angles over which the mirrors
rotate. In this chapter, we describe a straightforward approach to correct for
these distortion artifacts, creating an alternative to previously reported
ray-tracing schemes that are unable to apply these corrections in real-time. By
implementing the proposed 3D recalibration algorithm on the graphics card of a
standard computer, this feature can be applied in real-time. We validate the
accuracy of the technique using OCT measurements of a highly curved object
within a large imaging volume of 12.35 x 10.13 x 2.36 mm^3. The resulting 3D
object shape measurements are compared against high-resolution and
aberration-free optical profilometry measurements. Maintaining an optical
resolution of <10 micron within the sample, both axially and transversally, we
realized a real-time, high-resolution, large-volume OCT imaging system, capable
of producing distortion corrected wide-field OCT data with a geometric surface
shape accuracy of <15 micron.
