Int J Comput Assist Radiol Surg - A fast deformable registration method for 4D lung CT in hybrid framework.

Tópicos

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Resumo

RPOSE: A pulmonary respiration model for deformable registration of lung CT for the surgery path planning and surgical navigation is an important, difficult, and time-consuming task. This paper presents a new fast deformable registration method for 4D lung CT in a hybrid framework incorporating point set registration with mutual information registration.METHOD: The point sets of the lung surface and vessels are automatically extracted. Their displacement vectors are obtained by point set registration. The sum of squared Euclidean distance between the displacement vectors of these point sets and the displacement vectors based on the B-spline transformation model is minimized as a novel similarity measure to derive the rough transformation function. Finally, the rough transformation function is refined by using the mutual information-based registration method. To evaluate the effectiveness of the proposed method, the authors performed registrations on 20 4D lung volume cases from two different CT scanners. The proposed method was compared with the point set-based method, the mutual information-based method, and the ANTS method, which is a state-of-the-art deformable registration technique.RESULTS: The results show that the landmark distance errors and computation time of the proposed method decreased an average of 5 and 70 %, respectively, when compared to the mutual information-alone-based method. The proposed method results in an average of 28 % lower landmark distance error than registration method based on point sets in spite of increase in computation time. Moreover, compared with ANTS, the computation time of the proposed method is reduced by an average of 93 % in the case of comparable landmark distance errors.CONCLUSION: The accuracy and speed of the proposed deformable registration method indicate that the method is suitable for use in a clinical image-guided intervention system.

Resumo Limpo

rpose pulmonari respir model deform registr lung ct surgeri path plan surgic navig import difficult timeconsum task paper present new fast deform registr method d lung ct hybrid framework incorpor point set registr mutual inform registrationmethod point set lung surfac vessel automat extract displac vector obtain point set registr sum squar euclidean distanc displac vector point set displac vector base bspline transform model minim novel similar measur deriv rough transform function final rough transform function refin use mutual informationbas registr method evalu effect propos method author perform registr d lung volum case two differ ct scanner propos method compar point setbas method mutual informationbas method ant method stateoftheart deform registr techniqueresult result show landmark distanc error comput time propos method decreas averag respect compar mutual informationalonebas method propos method result averag lower landmark distanc error registr method base point set spite increas comput time moreov compar ant comput time propos method reduc averag case compar landmark distanc errorsconclus accuraci speed propos deform registr method indic method suitabl use clinic imageguid intervent system

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