Reactor Vessel Internals Segmentation Experience using Mechanical Cutting Tools

Development of Indigenous Instrument for Visual Inspection of Reactor Internals

Pre-commissioning and periodic in-service visual inspection of reactor vessel internals, of Prototype Fast Breeder Reactor (PFBR), is a mandatory regulatory requirement. An Indigenous Instrument (Periscope) is designed for this purpose. The instrument is accommodated within a tube of 400 mm outer diameter and has a length of 10 meters. The single tube contains viewing, illumination and the asso...

Vessel Segmentation in Retinal Images Using Graph-Theoretical Vessel Tracking

This paper presents a method for automatic segmentation of blood vessels in retinal images. The method is based on vessel tracking technique. The key idea of the method is that first a set of seed points (center of vessel cross sections) is extracted. Then, the seed points are connected to establish the vessel skeleton. Finally, the false vessel point are rejected by resorting to a hypothesis-v...

Reactor Pressure Vessel Embrittlement—i

Vessel Segmentation Using a Shape Driven Flow

We present a segmentation method for vessels using an implicit deformable model with a soft shape prior. Blood vessels are challenging structures to segment due to their branching and thinning geometry as well as the decrease in image contrast from the root of the vessel to its thin branches. Using image intensity alone to deform a model for the task of segmentation often results in leakages at...

Vessel Segmentation in Angiograms using Hysteresis Thresholding

Angiography (i.e. vessel imaging after the injection of a radiopaque substance) is a widely used procedure for vessel observation in both clinical routine and medical research. Often for the subsequent analysis of the vasculature it is needed to measure the angiogram area covered by vessels and/or the vessel length. For this purpose we need vessel enhancement and segmentation. While there are a...