abdomen · AP
Abdomen AP Supine (KUB)
Patient supine on table, arms by side, legs extended with support under knees.
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How to perform this view
- 01
Remove metal; give gown; empty bladder if needed.
- 02
Lay patient supine, MSP to midline of table.
- 03
Place support under knees to relax back.
- 04
Ensure no rotation - ASIS equidistant.
- 05
Centre CR at iliac crest, include symphysis pubis.
- 06
Expose on expiration.
Anatomical & patient position
Patient: Patient supine on table, arms by side, legs extended with support under knees.
Part: MSP centred to table; pelvis not rotated (ASIS equidistant from table).
Central ray & centring point
Perpendicular to IR at level of iliac crests on MSP.
Exposure factors
kVp
75-85 kVp
mAs
15-25 mAs (AEC: centre chamber)
SID
100 cm (40 in)
IR size
35 x 43 cm portrait
Grid
Yes
Respiration
Suspended expiration
Clinical indications
- Bowel obstruction
- Renal and ureteric calculi
- Foreign body
- Abdominal masses, organomegaly
Contraindications & precautions
- Pregnancy (relative) - confirm LMP / 10-day rule, justify exposure and shield where possible (abdomen - strict justification)
- Recent barium study may obscure anatomy
Structures shown & evaluation criteria
- Kidneys, ureters, bladder outlines
- Psoas muscle shadows
- Symphysis pubis to diaphragm (2 films for tall patients)
- Bowel gas pattern