Automatic Vessel Lumen Segmentation in Optical Coherence Tomograph (OCT) Images

This paper presents a graph based method to automatically and accurately segment the lumen borders from optical coherence tomography (OCT) images.
The proposed method unravels the OCT images from the Cartesian coordinates to polar coordinates so that the segmentation is transferred into a height field delineation problem. In effect, the method imposes a simplistic star shape prior but without the bias towards narrower lumen size. The lumen border is identified as the solution to finding the minimum closed set on a node weighed, directed graph. In order to cope with both the variability in imaging condition and different forms of image artefacts, we adopt an image feature that relies on very little assumption on the appearance of lumen border but is resilient to image noise and so on. This feature is derived from a convolution of the image gradient field and thus it takes into account gradient vector interactions at a much more global scale compared to conventional gradient based approaches. The proposed method is fully automatic without the need for an initialisation. We compare this method with a number of techniques, including both conventional methods and data driven models.