Patent ID: 9052384
Filing Date: 2015-06-09
Classification: A61B,G01S

Abstract:
1. A method of calibrating a transformation of 3-dimensional ultrasound data in an imaging system from a first coordinate system into a second coordinate system, the method calibrating a-transformation having parameters and calibrating the transformation by steps comprising: imaging, with a 3-dimensional ultrasound imaging system, an object having a planar surface to provide a first ultrasound data in the first coordinate system; extracting points corresponding to ultrasound rays intersecting the planar surface of the object from the first ultrasound data; and fitting the parameters such that the points when transformed by the transformation describe a planar surface in the second coordinate system; and using the calibrated transformation by: obtaining additional ultrasound images using the 3-dimensional ultrasound imaging system, the additional ultrasound images being images of a patient undergoing surgery obtained in a spherical coordinate system; and using the transformation with the fitted parameters to coregister the additional ultrasound images to images in a rectilinear coordinate system.