Table 1.

6-DOF parameters for simulated motion cases

Simulation Study	Translation X (mm)	Translation Y (mm)	Translation Z (mm)	Rotation X (deg)	Rotation Y (deg)	Rotation Z (deg)
XTwo Translation	10	0	0	0	0	0
XTwo Rotation	0	0	0	5	0	0
YTwo Translation	0	10	0	0	0	0
YTwo Rotation	0	0	0	0	5	0
ZTwo Translation	0	0	10	0	0	0
ZTwo Rotation	0	0	0	0	0	5
XThree Translation	Group 1=10, Group 2=5	0	0	0	0	0
XThree Rotation	0	0	0	Group 1=5, Group 2=2.5	0	0
YThree Translation	0	Group 1=10, Group 2=5	0	0	0	0
YThree Rotation	0	0	0	0	Group 1=5, Group 2=2.5	0
ZThree Translation	0	0	Group 1=10, Group 2=5	0	0	0
ZThree Rotation	0	0	0	0	0	Group 1=5, Group 2=2.5
Complex	Object at each projection moved according to values obtained from external marker signal (fig. 2)