Given the source and detector sizes in problem 8-3, how do you change the CT geometry (the source-to-iso-center and source-to-detector distances) to achieve a balanced design so that the system MTF is not dominated by either the focal spot size or the detector cell size?

Data from problem 8-3

The source-to-iso distance of a CT system is 550 mm and the source-to detector system is 950 mm. If both the source and detector cell can be modeled by rectangular functions with a 1-mm width, analytically estimate the iso-center MTF of the system in the x-y plane.