Comput Math Methods Med - Nonrigid 3D medical image registration and fusion based on deformable models.


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For coregistration of medical images, rigid methods often fail to provide enough freedom, while reliable elastic methods are available clinically for special applications only. The number of degrees of freedom of elastic models must be reduced for use in the clinical setting to archive a reliable result. We propose a novel geometry-based method of nonrigid 3D medical image registration and fusion. The proposed method uses a 3D surface-based deformable model as guidance. In our twofold approach, the deformable mesh from one of the images is first applied to the boundary of the object to be registered. Thereafter, the non-rigid volume deformation vector field needed for registration and fusion inside of the region of interest (ROI) described by the active surface is inferred from the displacement of the surface mesh points. The method was validated using clinical images of a quasirigid organ (kidney) and of an elastic organ (liver). The reduction in standard deviation of the image intensity difference between reference image and model was used as a measure of performance. Landmarks placed at vessel bifurcations in the liver were used as a gold standard for evaluating registration results for the elastic liver. Our registration method was compared with affine registration using mutual information applied to the quasi-rigid kidney. The new method achieved 15.11% better quality with a high confidence level of 99% for rigid registration. However, when applied to the quasi-elastic liver, the method has an averaged landmark dislocation of 4.32mm. In contrast, affine registration of extracted livers yields a significantly (P = 0.000001) smaller dislocation of 3.26mm. In conclusion, our validation shows that the novel approach is applicable in cases where internal deformation is not crucial, but it has limitations in cases where internal displacement must also be taken into account.

Resumo Limpo

coregistr medic imag rigid method often fail provid enough freedom reliabl elast method avail clinic special applic number degre freedom elast model must reduc use clinic set archiv reliabl result propos novel geometrybas method nonrigid d medic imag registr fusion propos method use d surfacebas deform model guidanc twofold approach deform mesh one imag first appli boundari object regist thereaft nonrigid volum deform vector field need registr fusion insid region interest roi describ activ surfac infer displac surfac mesh point method valid use clinic imag quasirigid organ kidney elast organ liver reduct standard deviat imag intens differ refer imag model use measur perform landmark place vessel bifurc liver use gold standard evalu registr result elast liver registr method compar affin registr use mutual inform appli quasirigid kidney new method achiev better qualiti high confid level rigid registr howev appli quasielast liver method averag landmark disloc mm contrast affin registr extract liver yield signific p smaller disloc mm conclus valid show novel approach applic case intern deform crucial limit case intern displac must also taken account

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