Progressive model-based adaptation

摘要

The invention relates to an adaptation system for adapting a deformable model comprising a plurality of model elements to an object of interest in an image data set, the adaptation system comprising a selector for selecting at least one image- driven model element from the plurality of model elements and an adapter for adapting the deformable model on the basis of optimizing a model energy of the deformable model, the model energy comprising an internal energy of the plurality of model elements and an external energy of the at least one image-driven model element, thereby adapting the deformable model. By enabling the adaptation system to selectively choose the image- driven model elements, the adaptation system of the current invention allows excluding a poorly adaptable model element from interacting with the image data set and thus from being pulled and/or pushed by the image data set into a wrong location.

主权项

1. An adaptation system for adapting a deformable model comprising a plurality of model elements to an object of interest in an image data set, said system comprising:
a processor configured to:
display, with a display monitor, the image data set, wherein the image data set is generated by an imaging system and the object of interest has a first shape;retrieve a deformable model, where the deformable model includes a model of the object of interest represented through a plurality of image-driven model elements, wherein the deformable model is a polygonal mesh and each image-driven model element is a polygon of the polygonal mesh, each of the image-driven model elements includes information regarding a shape, a location and an orientation of a different area of a surface of the deformable model, and the deformable model has a second shape, which is not the same as the first shape;initialize the deformable model by superimposing the deformable model at least partially over the object of interest;compute a new location for each of the image-driven model elements based on an internal energy between the image-driven model elements and an external energy between the image-driven model elements and target locations on the object of interest; andadapt the deformable model by changing its shape based on the new locations so that the deformable model has a third shape, which is closer to the first shape of the object of interest than the second shape, producing an adapted deformable model, wherein the processor iteratively adapts the deformable model to the object of interest, wherein the processor determines an adaptation order of each of the plurality of model elements and selects the at least one image-driven model element based on the adaptation order and on the iteration cycle, and wherein the adaptation order of the each of the plurality of model elements is determined based on a measure of quality of each of the plurality of model elements.