Patent Document ID: 7747057
Application ID: 11442450
Patent Status: 1

Claim One:
1. A CT system comprising: a rotatable gantry having an opening to receive a patient to be scanned; a high frequency electromagnetic energy projection source configured to project a cone beam of high frequency electromagnetic energy beam toward the object; a detector array configured to detect high frequency electromagnetic energy passing through the patient, the detector array including a plurality of detector pixels; a data acquisition system (DAS) connected to the detector array and configured to receive image data therefrom; and a computer programmed to: reconstruct 3D images from the image data; perform a bone thresholding analysis on the 3D images to generate segmented 3D images; determine an image center for each of the segmented 3D images; generate 2D parallel beam forward projections from the segmented 3D images, wherein each 2D parallel beam forward projection is generated from a respective segmented 3D image based on the image center of the respective segmented 3D image; apply bone-induced spectral (BIS) calibration data to the 2D parallel beam forward projections to generate BIS correction projections, the BIS calibration data comprising a pair of floating point coefficients for each detector pixel that define a BIS calibration vector representative of a BIS effect for that detector pixel; and apply a BIS correction to the 3D images based on the BIS correction projections to generate a BIS corrected image.