Int J Comput Assist Radiol Surg - Multi-compartment heart segmentation in CT angiography using a spatially varying gaussian classifier.

Tópicos

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Resumo

JECTIVE: A fully automated and efficient method for segmenting ten major structures within the heart in Cardiac CT Angiography data for the purposes of display or cardiac functional analysis.MATERIALS AND METHODS: A spatially varying Gaussian classifier is a flexible model for segmentation, combining the advantages of atlas-based frameworks, with supervised intensity models. It is composed of an independent Gaussian classifier at each voxel and uses non-rigid registration for the initial spatial alignment. We show how this large model can be trained efficiently and present a novel smoothing technique based on normalised convolution to mitigate inherent overfitting issues. The 30 datasets used in this study are selected from a variety of different scanners in order to test the robustness and stability of the algorithm. The datasets were manually segmented by a trained clinician.RESULTS: The method was evaluated in a leave-one-out fashion, and the results were compared to other state of the art methods in the field, with a mean surface-to-surface distance of between 0.61 and 2.12 mm for different compartments.CONCLUSION: The accuracy of this method is comparable to other state of the art methods in the field. Its benefits lie in its conceptual simplicity and its general applicability. Only one non-rigid registration is required, giving it a speed advantage over multi-atlas approaches. Further accuracy may be achievable through the incorporation of an explicit shape model.

Resumo Limpo

jectiv fulli autom effici method segment ten major structur within heart cardiac ct angiographi data purpos display cardiac function analysismateri method spatial vari gaussian classifi flexibl model segment combin advantag atlasbas framework supervis intens model compos independ gaussian classifi voxel use nonrigid registr initi spatial align show larg model can train effici present novel smooth techniqu base normalis convolut mitig inher overfit issu dataset use studi select varieti differ scanner order test robust stabil algorithm dataset manual segment train clinicianresult method evalu leaveoneout fashion result compar state art method field mean surfacetosurfac distanc mm differ compartmentsconclus accuraci method compar state art method field benefit lie conceptu simplic general applic one nonrigid registr requir give speed advantag multiatla approach accuraci may achiev incorpor explicit shape model

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