“…The 2D PSF is measured in the scanner to use in Eq. 1; alternatively, the corresponding line spread function (LSF) is measured by assuming that the spatial resolution in the scan plane has a rotational symmetry, as assumed in previous studies [3,12,13,16,20], and that the 2D PSF is derived from the LSF [8,10,11]. The SSP is also measured before the 3D CT data set [I(x,y,z)] of an assumed object is computed using Eq.…”