Lumbar Spine Projections

Question 1

AP Projection CR and Collimation

Answer 1

Perpendicular Beam

Central Ray: level of iliac crest

8x17

Question 2

Lateral Projection and Collimation

Answer 2

Mark Anterior

Perpendicular to L4 (iliac crest), entering mid coronal plane

8x17

Question 3

L5-S1 Projection and Collimation

Answer 3

• Center on a coronal plane 2 inches posterior to elevated ASIS and 1.5 inches inferior to iliac crest
• If spine is not horizontal tilt 5 for men and 8 for women

6x8

Question 4

AP Oblique RPO / LPO

Answer 4

• CR is perpendicular and enters 2 inches medial to elevated ASIS and 1.5 inches above iliac crest
  9x14

Question 5

Lumbar Spine Projection’s with Collimation in order, you would do them:

Answer 5

• AP, Perpendicular at Level of iliac crest (8x17)

DO NOT CHANGE COLLIMATION, Simply roll patient onto side

• Lateral, Perpendicular entering midcoronal plane at level of iliac crests (8x17)
• Obliques RPO/LPO Perpendicular, entering 2 inches medial to elevated ASIS and 1 1/2 inches above iliac crest
  (9x14)

-L5-S1 5-8 Angle On Coronal Plane 2 inches posterior to ASIS and 1 1/2 inches inferior to crest
(6x8)

Always mark side down!!