Patent ID: 9036899
Filing Date: 2015-05-19
Classification: A61B,G06T,G16H

Abstract:
1. A method for volumetric quantification of local bone changes comprising the steps of: loading at least a first and second computed tomography three dimensional image, registering said at least first three dimensional image and second three dimensional image to one coordinate system, selecting a region of interest in one of said first three dimensional image or said second three dimensional image, for said first three dimensional image and said second three dimensional image, segmenting the local bone within the region of interest by segmenting voxels related to air and/or soft tissues within the region of interest and attributing these voxels to an outside region, while the volume formed by the remaining volume represent the local bone or the local bone with soft tissue, and calculating the volume of local bone in the first three dimensional image and the volume of local bone in said second three dimensional image and subtracting said first volume from said second volume and defining the difference as the local bone change or the change in local bone with soft tissue, wherein said selecting of the region of interest comprises the steps: selecting a set of anatomical landmarks in one of said first three dimensional image or second three dimensional image, determining a set of clipping planes which construct a volume forming the region of interest in the respective three dimensional image on the basis of said anatomical landmarks, and removing all data from the respective three dimensional image outside the region of interest.