Elastic registration using 3D ChainMail: application to virtual colonoscopy
Carlos R. Castro‐Pareja, Barry Daly, Raj Shekhar · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2006
We present an elastic registration algorithm based on local deformations modeled using cubic B-splines and controlled using 3D ChainMail. Our algorithm eliminates the appearance of folding artifacts and allows local rigidity and compressibility control independent of the image similarity metric being used. 3D ChainMail propagates large internal deformations between neighboring B-Spline control points, thereby preserving the topology of the transformed image without requiring the addition of penalty terms based on rigidity of the transformation field to the equation used to maximize image similarity. A novel application to virtual colonoscopy is presented where the algorithm is used to significantly improve cross-localization between colon locations in prone and supine CT images.