Table 1 Geometric parameters used by the co-registration and overlap algorithm

x _{pinhole, n}

x coordinate of the pinhole nr. n = 1, 2, 3, 4

y _{pinhole, n}

y coordinate of the pinhole nr. n = 1, 2, 3, 4

d _{x-ray detector}

Effective diameter x-ray detector

x _{x-ray detector}

Shift of the x-ray detector with respect to the center of the coordinate system

y _{x-ray detector}

Shift of the x-ray detector with respect to the center of the coordinate system