Patent ID: 9179533
Filing Date: 2015-11-03
Classification: A61B,G06F,G06T,H05G

Abstract:
1. A method, comprising: (a) detecting unobstructed radiation with a first detector; (b) concurrently detecting unobstructed radiation with a second detector, wherein the second detector includes a filter material with a known thickness and spectral characteristics and the first detector does not include any filter; (c) determining a ratio of output data from the first detector to the second detector; performing (a)-(c) for a plurality of known tube voltages; and generating a mapping between the ratio and tube voltage as a function of the tube voltages; identifying projection data generated during an x-ray tube arc event; determining x-ray tube voltages for data points of the identified projection data, wherein determining the x-ray tube voltages for the data points includes determining the x-ray tube voltages based on the mapping; correcting the identified data points based on the determined x-ray tube voltages for the data points, wherein the data points are corrected based on the following transformation: where u corrected is the corrected projection data, kV is the determined x-ray tube voltage and a, b and c are constants in units of a thickness of the filter material determined by performing three scans at three known voltages and solving three simultaneous equations; reconstructing projection data that includes projection data generated during non x-ray tube arc events and the corrected projection data, which generates volumetric image data; and displaying on a display unit the volumetric image data generated by reconstructing the projection data that includes the projection data generated during non x-ray tube arc events and the corrected projection data.