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spine · AP
Lumbar Spine AP
Patient supine, knees flexed.
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AI Patient · KV Sir
How to perform this view
- 01
Supine; flex hips and knees, feet flat.
- 02
MSP to midline.
- 03
CR at iliac crest (L4-L5) for 35x43, or L3 (lower costal margin) for 30x35.
- 04
Expose on expiration.
Anatomical & patient position
Patient: Patient supine, knees flexed.
Part: MSP centred; knees flexed to flatten lumbar lordosis.
Central ray & centring point
Perpendicular at level of iliac crest (L4) or L3.
Exposure factors
kVp
75-85 kVp
mAs
20-30 mAs
SID
100 cm
IR size
30 x 35 or 35 x 43 cm portrait
Grid
Yes
Respiration
Suspended expiration
Clinical indications
- Low back pain with red flags
- Fractures, spondylolisthesis, scoliosis
Contraindications & precautions
- Pregnancy (relative) - confirm LMP / 10-day rule, justify exposure and shield where possible (high gonadal dose - strict justification)
Structures shown & evaluation criteria
- L1-L5, sacrum
- Transverse processes
- Psoas margins