Dual-beam manually-actuated catheters for wide-field distortion-corrected optical imaging

Previously, we have demonstrated two fiber optic catheter implementations of dual-beam manually-actuated distortion-corrected imaging (DMDI) that employ rotationally-scanning micromotors that are potentially suitable for endoscopic imaging applications. These catheters are able to correct for both axial (push/pull) and azimuthal (catheter rotation) manual actuation. We presented a multiplexed dual beam micromotor catheter (mDBMC), an OCT-specific design that depth-multiplexes both imaging channels within a single optical fiber and a dual-fiber parallel DBMC (pDBMC) design that is suitable for any point-scanning modality such as OCT, fluorescence, or reflectance imaging. As the mDBMC has a relatively simple scan pattern, we developed a straightforward automated method for distortion correction based on image frame cross-correlation. Due to the complicated scan pattern of the pDBMC, we initially co-registered image features for the pDMBC in a time-consuming manual process. In this work, we describe our efforts to develop an automated distortion correction method for the pDMBC. We demonstrate initial success in automated correction along the pullback dimension.