System Matrix Calculation for 2D Image Reconstruction Algorithms for the Clear-PEM Scanner
In this paper, we present three different methods that we have developed (the pixel-driven, the ray-driven and the tube-driven method) to calculate the system matrix. The comparison of these methods was done with the help of Monte Carlo simulated data, which allowed evaluating image spatial resolution, convergence speed and image uniformity.
The results showed that the tube-driven method allowed the best image spatial resolution and the best values of the homogeneous index calculated, with any of the image reconstruction algorithm. These results strongly recommend the use of this system matrix in future works in which we will compare the image reconstruction algorithms regarding the lesion detectability with data simulated using a digital breast phantom.
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