Patent ID: 8724874
Filing Date: 2014-05-13
Classification: G06T

Abstract:
1. A method for registration of ultrasound device in three dimensions to a C-arm scan comprising: acquiring a baseline volume from a C-arm computed-tomography apparatus; inserting and navigating an ultrasound device to an organ in a patient's body; performing an initial registration of an ultrasound image acquired by said ultrasound device to said baseline volume; acquiring a plurality of images in which the ultrasound device is captured; performing a multimodal registration of the ultrasound volume to the baseline volume, by an iterative search that includes resampling data of the baseline volume in a neighborhood of the ultrasound device and optimizing an alignment of the baseline volume to an ultrasound volume using an image similarity metric, wherein said image similarity metric is wherein CC is a Pearson's correlation coefficient, N is the number of ultrasounds volumes U, T is a transformation matrix mapping the ultrasound volume U on the baseline volume R, and φ is a 6-vector that parameterizes T, and said optimization includes a search on a rotation about an axis of the ultrasound device followed by a Simplex direct search; and performing fusion of said registered ultrasound volume and baseline volume to display a view of the ultrasound device in the baseline volume, wherein the steps of performing an initial registration, performing a multimodal registration, and performing fusion are executed by a computer processor.