Gantry angle (g) [degree]	Ring angle (r) [degree]
Gantry angle (g) [degree]	r ≤ −20	−20 < r ≤ 20	20 < r
0 ≤ g < 45	139	0	89
45 ≤ g < 90	0	99	0
90 ≤ g < 135	0	99	0
135 ≤ g < 180	0	157	0
180 ≤ g < 225	33	99	35
225 ≤ g < 270	89	188	129
270 ≤ g < 315	172	0	124
315 ≤ g < 360	89	130	129