Lumbar
AP IR Size: 14x17 LW SID: 40'' Page #'s: 1:412,162	Positioning:   • Pt supine   • flex knees (to reduce lordosis)	CR Entrance & Angle:   • AP Lumbar - _|_ L3(1.5'' Sup to iliac crest or AP Lumbosacral - _|_ L4 (at iliac crest)   • Collimation:   • to lat margin of psoas muscles Respiration:   • Suspend at end of exhalation	Eval Criteria:   • NR Spinous processes at the midline of the vertebral bodies   • Open Intervertebral joints   • No elastic band from underclothing artifact   • Sacroiliac joints equidistant from the vertebral column
AP Oblique (RPO & LPO) IR Size: 11x14 (or 14x17) LW SID: 40'' Page #'s: 1:420,168	Positioning:   • Pt supine & rotate 45°   • Knees flexed   • Arms crossed high over chest	CR Entrance & Angle:   • _|_ L3 (1.5'' Sup to iliac crest) & 2'' Medial to elevated ASIS   • Collimation:   • 10x17 (14) Respiration:   • Suspend on exhalation Best to Determine:   • Open zygapophyseal joint closest to IR	Eval Criteria:   • Scottie dog   • Zygapophyseal joints closest to the IR-open and uniformly visible through the vertebral bodies   • When the joint is not well seen, and the pedicle is anterior on the vertebral body, the patient is not rotated enough…   • Vertebral column parallel with the tabletop so that T12-L1 & L1-2 intervertebral joint spaces remain open
Lateral IR Size: 14x17 LW SID: 40'' Page #'s: 1:416,164	Positioning:   • Pt TLP, recumbent   • Knees flexed & SI   • Arms at right angles   • Use lead rubber sheets for scatter	CR Entrance & Angle:   • Lat Lumbar-_|_ L3(1.5'' Sup to iliac crest or Lat Lumbosacral - _|_ L4 (at iliac crest). If spine not ||   • CR caudad 8° female, 5° male Collimation:   • close Respiration:   • Suspend on exhalation	Anatomy to IR:   • Eval Criteria:   • Open Intervertebral foramina & disk spaces   • Nearly SI iliac crests when no angle is used   • SI posterior margins of each vertebral body   • Vertebrae centered
Lateral (for L5-S1) (Spot) (L5-S1 Spot) IR Size: 8x10 LW SID: 40'' Page #'s: 1:418,166	Positioning:   • Pt TLP, recumbent   • Arms flexed   • Legs slightly superimposed & slightly bent   • Use lead rubber sheets for scatter	CR Entrance & Angle:   • _|_ 1.5'' inferior to elevated iliac crest & 2'' posterior to elevated ASIS. If spine not ||   • CR caudad 8° female, 5° male Collimation:   • close Respiration:   • Suspend on exhalation	Anatomy to IR:   • Eval Criteria:   • Open Lumbosacral Joint and centered   • Entire L5 & Upper Sacrum   • Crests closely SI if no CR angle