L spine, Sacrum, Coccyx

L spine AP technique (or PA)

80 kVp @ 25-40 mAs

L spine AP (or PA) central ray

1 1/2” above the iliac crests or at the level of the lower costal margin (L3)

L spine Oblique technique

80 kVp @ 30-50 mAs

L spine oblique CR

Directed to L3- 1-2” above the iliac crest and 2” medial to the upside ASIS

L spine Lateral technique

80 kVp @ 40-100 mAs

L spine Lateral CR

Directed to level of the iliac crests

Directed to L3

L spine Lateral L5-S1 (spot) technique

80 kVp @ 60-120 mAs

L spine Lateral L5 - S1 (spot) CR

Perpendicular to IR or 5-8 degrees caudal if vertebral line is saggy

directed at 1.5” inferior to iliac crests and 2” posterior to ASIS

Sacrum AP axial technique

80 kVp @ 20-32 mAs

AP axial Sacrum CR

Angle CR 15 degrees cephalic (15 to the nose)

Direct CR 2” superior to the symphysis pubis

AP Axial Coccyx technique

80 kVp @ 12-25 mAs

AP Axial Coccyx CR

Angle CR 10 degrees caudal (10 to the toes)

Direct CR 2” superior to the symphysis pubis

Sacrum and Coccyx Lateral technique

80 kVp @ 40-80 mAs

Sacrum and Coccyx Lateral CR

Direct CR 3-4” posterior to ASIS

Sacroiliac Joints AP Axial technique

80 kVp @ 20-32 mAs

Posterior Oblique SI Joints technique

80 kVp @ 20-32 mAs

SI joints CR AP axial CR

Angle CR 30-35 degrees cephalic

(males 30, females 35)

Direct CR to midline about 2” below the level of ASIS

Posterior oblique SI joints CR

Perpendicular to IR

Direct CR 1” medial to upside ASIS