Patent ID: 8649587
Filing Date: 2014-02-11
Classification: G06T

Abstract:
1. A method of estimating scattered radiation in a radiographic projection of an object, the radiographic projection generated by an imaging device irradiated by a radiation source spaced therefrom to provide a space for the object, the imaging device measuring incident radiation at a plurality of pixels at corresponding locations, the radiographic projection comprising a plurality of radiation values corresponding to a plurality of pixel locations of the imaging device, each radiation value comprising a primary radiation amount representative of the radiation reaching the corresponding pixel along a direct path from the radiation source and a scattered radiation amount representative of other radiation reaching the corresponding pixel, the method comprising: obtaining an estimate of a radiation amount associated with a first location of the radiographic projection, the radiation amount comprising one of a radiation amount emitted by the radiation source or the primary radiation amount at the first location; generating an estimate of scattered radiation at a plurality of locations of the radiographic projection using the estimate of the radiation amount at the first location and a kernel that generates a value representative of scattered radiation for a location of the radiographic projection in relation to the distance between that location and the first location, the kernel having a form that is asymmetric about the location of the first pixel location, wherein the two-dimensional array of the imaging device comprises a flat surface, and wherein generating an estimate of scattered radiation further uses a skew correction factor to at least partially correct for skewing of data values due to the projection of the scattered radiation onto a flat surface, wherein the skew correction factor for a second location of the plurality of locations includes: