DEFORMABLE REGISTRATION METHOD USING TPS AND B-SPLINE

摘要

We develop a hybrid method joint using combining Thin-rnPlate Spline(TPS) and B-spline to improve both thernefficiency and accuracy of the conventional B-spline inrnregistration of CT image. The proposed algorithm consistsrnof two steps. First, we use TPS as a global registrationrnmethod to register two CT images rapidly, deformingrnlarge unfit regions in the moving image to matchrncounterpart in the reference image. Then B-spline is usedrnfor local registration, the previous deformed movingrnimage using TPS is further deformed to match thernreference image more accurately. In our experiment, arncouple of clinical images are simulated using the two-steprnalgorithm above, result in a tremendous improvement inrnboth run-time and registration quality, compared with thernconventional methods solely using either TPS or B-spline.rnIt is demonstrated that the proposed method can combinernthe efficiency of TPS and the accuracy of B-spline,rnperforming good adaptivity and robust in registration ofrnclinical CT image.