Lateral Lumbar L5-S1 (Spot)

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5 Terms

1
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How to position the patient for a Lateral L5-S1 projection?

  • lateral recumbent

  • hips and knees flexed and superimposed

  • with elbows flexed, place arms at right angle to body

  • support lower spine in horizontal position in same manner as for lateral projection

2
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Where is the central ray placed for a Lateral L5-S1 projection?

  • when spine is horizontal: perpendicular to a coronal plane 2” posterior to anterior superior iliac spine (ASIS) and 1½” inferior to iliac crest

  • if not horizontal, angle 5 degrees caudad for males, 8 degrees caudad for females

3
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What is the collimation field for a Lateral L5-S1 projection?

radiation field 6 Ă— 8 inches

4
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What is the Evaluation Criteria for a Lateral L5-S1 projection?

  • lumbosacral joint centered

  • open lumbosacral intervertebral disk space

  • crests of the ilia closely superimposing each other when the x-ray beam is not angled

5
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The Lateral Lumbar L5-S1 projection primarily visualizes the:

  • L5-S1 vertebral bodies

  • intervertebral disk spaces (open)