Feasibility of the use of a pixelated transmission chamber to measure scattered-radiation in projection radiography: I. Monte Carlo analysis of x-ray scatter propagation and detector modeling

In this paper, we propose the use of a pixelated transmission chamber, placed between the patient and the imaging detector, to measure the scatter component of a radiation beam impinging on said imaging detector. Using Monte Carlo simulation, a three-parameter model for the propagation of the scatter component in the transmitted beam is first developed. The use of the transmission chamber to determine the model parameters is then modeled, again using Monte Carlo simulation, and the feasibility of this approach is determined. The amount of radiation backscattered from the imaging detector into the transmission chamber was also calculated, for several separation distances between the two. It is shown that at a separation of 10 cm, the amount of backscatter radiation is independent of the imaged object and that therefore it can be determined as part of a calibration procedure for the transmission chamber.