Robust,real-time,dense and deformable 3D organ tracking in laparoscopic videos

Abstract

An open problem in computer-assisted surgery is to robustly track soft-tissue 3D organ models in laparoscopic videos in real-time and over long durations. Previous real-time approaches use locally-tracked features such as SIFT or SURF to drive the process,usually with KLT tracking. However this is not robust and breaks down with occlusions,blur,specularities,rapid motion and poor texture. We have developed a fundamentally different framework that can deal with most of the above challenges and in real-time. This works by densely matching tissue texture at the pixel level,without requiring feature detection or matching. It naturally handles texture distortion caused by deformation and/or viewpoint change,does not cause drift,is robust to occlusions from tools and other structures,and handles blurred frames. It also integrates robust boundary contour matching,which provides tracking constraints at the organ’s boundaries. We show that it can track over long durations and can handles challenging cases that were previously unsolvable.