Sacroiliac
AP Axial IR Size: 10x12 LW SID: 40'' Page #'s: 1:424,170	Positioning:   • Pt Supine   • (Have pt empty bladder…)	CR Entrance & Angle:   • to L5-S1(1.5'' superior to pubic sym or 2.5'' inferior to ASIS)   • females-35° cephalad , males 30° cephalad Collimation:   • 9x11 Respiration:   • Suspend	Anatomy to IR:   • Eval Criteria:   • Open L5/S1   • Both SI joints
PA Axial IR Size: 10x12 LW SID: 40'' Page #'s: 1:425,	Positioning:   • Pt Prone   • (SI Joint is closer to IR in PA)	CR Entrance & Angle:   • to L4(level of iliac crests)   • 35° caudad Collimation:   • 9x11 Respiration:   • Suspend	Anatomy to IR:   • Eval Criteria:   • Open L5/S1
AP Oblique (RPO & LPO) IR Size: 10x12 LW SID: 40'' Page #'s: 1:426,172	Positioning:   • Pt Supine   • Body rotated 25°-30° (use 45° sponge compressed w/ body)	CR Entrance & Angle:   • _|_ 1'' medial to elevated ASIS   • Collimation:   • Best to Determine:   • SI joint farthest from IR (ex LPO=Right SI Joint)	Eval Criteria:   • Open SI joint with minimal overlapping of ilium and sacrum and centered