Patent ID: 7551716

Claim:
A projection radiography apparatus comprising: a radiation source that emits radiation to an object corresponding to a portion of a patient under medical examination having scatter material causing a scatter portion; a radiation detector that supplies projection data; a data memory that stores information about scattering, the information determined by Monte Carlo simulations which calculate the interactions of photons with scatter material for different distributions of scatter material; and a processing unit configured to: generate a first projection image from the projection data based on a combination of primary radiation and secondary radiation incident on the detector; perform a data reduction on the first projection image in which multiple different regions of the object are assigned specific tissue distributions; determine a scatter material distribution of the object based upon the projection data supplied by the detector, including assigning a scatter beam spread function to each of the multiple regions of the object; obtain scatter information from the data memory which corresponds to each assigned scatter beam spread function; use the scatter information to determine, with the scatter beam spread function, a scatter beam correction corresponding to contribution of the secondary radiation in the projection data; and generate a corrected image of the object based on a combination of the first projection image and the scatter beam correction, so that a portion of the secondary radiation present in the projection data is removed in the process of generating the corrected image.