EP-1283: Hierarchical enhanced non-rigid registration for target volume correction and propagation

Hierarchical enhanced non‐rigid registration for target volume correction and propagation for adaptive external beam radiotherapy of carcinoma of the prostate

Volumes change during fractionated radiotherapy (RT). We investigate a tool based on the Hierarchical Enhanced Registration Algorithm (HERA) to project a 3D segmentation set of the prostate into the subsequent imaging sets at any time point during RT by using intensity-based image registration techniques. Sequential CT sets during RT at 15, 30, 45, and 60 Gy of two patients were used. Five expe...

An Alternating-Constraints Algorithm for Volume-Preserving Non-rigid Registration of Contrast-Enhanced MR Breast Images

We propose and evaluate in this work a novel optimization strategy for intensity-based non-rigid image registration of contrastenhanced images with a volume-preservation constraint. Since patient motion correction and volume preservation are to some extent mutually exclusive goals, one is usually faced with a trade-off between volume preservation of contrast-enhancing structures and artifact re...

Non-Rigid Image Registration

An important hypothesis of the research reported in this paper is that dynamic space warping (DSW), a dynamic programming (DP) technique (Bellman 1965, Brown 1996), can be effectively used for object matching and for inference of the image registration warping function. For this end, a novel, robust, and efficient method for non-rigid image registration using DSW in the “length–code” domain is ...

Similarity Measures for Non-Rigid Registration

Similarity measures for non-rigid multimodal registration are required to be local in order to enable correction of small image differences, and multimodal, to allow images to be acquired using different imaging techniques. Unfortunately all commonly used multimodal similarity measures are inherently global and cannot be directly used to estimate local image properties. We have derived a local ...

Non-Rigid Morphological Image Registration