Table 2.

Difference from expected phantom positions based on co‐registration with reference cone beam computed tomography of film pinprick phantom at stereotactic center (100, 100, 100).

	Rotation (°)			Translation (mm)
	X	Y	Z	X	Y	Z
Position 100, 100
Registration 1	−0.02	0.01	0.01	−0.02	0.01	0.01
Registration 2	0.00	0.01	−0.02	−0.02	0.00	0.02
Registration 3	0.00	0.00	−0.04	−0.02	0.00	0.01
Average	−0.01	0.01	−0.02	−0.02	0.00	0.01
Position 100, 100 R90
Registration 1	−0.01	−0.08	−0.46	0.00	−0.08	0.02
Registration 2	−0.05	−0.06	0.21	0.01	−0.09	0.02
Registration 3	−0.05	0.00	−0.38	0.04	−0.07	0.05
Average	−0.04	−0.05	−0.21	0.02	−0.08	0.03
Position 160, 160
Registration 1	−0.03	0.05	0.27	0.11	0.14	−0.02
Registration 2	−0.02	0.03	−0.09	0.09	0.14	0.04
Registration 3	0.00	0.02	0.25	0.09	0.14	0.04
Average	−0.02	0.03	0.14	0.10	0.14	0.02
Position 160, 40
Registration 1	0.00	0.02	−0.03	0.09	−0.10	0.00
Registration 2	−0.04	−0.04	0.15	0.14	−0.10	0.03
Registration 3	−0.02	0.02	0.16	0.08	−0.07	0.01
Average	−0.02	0.00	0.09	0.10	−0.09	0.01
Position 40, 40
Registration 1	−0.02	−0.04	−0.24	−0.06	−0.04	0.00
Registration 2	0.00	−0.02	0.12	−0.06	−0.04	−0.01
Registration 3	−0.02	−0.01	0.23	−0.06	−0.05	−0.05
Average	−0.01	−0.02	0.04	−0.06	−0.04	−0.02
Position 40, 160
Registration 1	−0.03	−0.01	0.06	−0.10	0.05	−0.02
Registration 2	−0.02	0.00	0.22	−0.11	0.06	−0.03
Registration 3	−0.02	0.00	0.10	−0.10	0.05	−0.03
Average	−0.02	0.00	0.03	−0.10	0.05	−0.03