TABLE I.

CBCT geometrical calibration parameters.

Bead used	u0 (pixel)	v0 (pixel)	SDD (mm)	SAD (mm)	SDD/SAD	Rotation (deg)
Bead #1 and #6	999.40	754.02	274.12	179.53	1.53	−0.12
Bead #2 and #5	999.30	754.13	274.18	179.64	1.53	−0.12

Note: u0 and v0 are the positions in number of pixels along the horizontal and vertical side of the image panel, respectively. There are 1936 pixels along u0 direction and 1544 pixels along v0 direction. SDD: distance form source to detector panel; SAD: distance from source to animal stage rotation axis; and Rotation: in-plane rotation of imaging panel. SDD/SAD is the ratio for image magnification.