Patent ID: 8326011
Filing Date: 2012-12-04
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; obtaining a plurality of estimates of the object's thickness along a plurality of direct paths from the radiation source to a corresponding plurality of locations of the imaging device and the radiographic projection; 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 form of the kernel varies about the first location of the radiographic projection in relation to the estimates of the object thickness about the first location, wherein the value of the kernel at a location is related to a difference between the estimate of object thickness at the location and the estimate of object thickness at the first location, wherein the kernel comprises an amplitude factor S storing the estimate of the scattered radiation in a computer-readable medium.