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Figure 4: Geometric depiction of the coordinates defining attenuation path length for the Jaszczak phantom. The center of the phantom represented by (xc,yc), the point source location by (x_{0},y_{0}), the boundary point along angle θ_{i}(i = 1, 2) represented by (x^{'}_{i},y^{'}_{i}) and the attenuation path length for the i^{th} angle represented by l_{i} 
