Coccyx
AP Axial IR Size: 8x10 LW SID: 40'' Page #'s: 1:430,178	Positioning:   • Pt Supine	CR Entrance & Angle:   • 2'' superior to pubic sym (2'' inf ASIS)   • 10° caudad (PA Axial 10° cephalad) Collimation:   • 5x5 Respiration:   • Suspend	Anatomy to IR:   • Eval Criteria:   • Coccygeal segments not superimposed   • NR and centered
Lateral IR Size: 8x10 LW SID: 40'' Page #'s: 1:432,180	Positioning:   • Pt TLP	CR Entrance & Angle:   • _|_ 3.5'' posterior & 2'' inferior to ASIS (For both Sacrum & Coccyx at same time 1'' inferior to ASIS)   • Collimation:   • 5x5 Respiration:   • Suspend	Eval Criteria:   • Use of tight collimation and a lead rubber absorber behind the sacrum   • Closely SI posterior margins of the ischia and ilia