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spine · AP Axial / Lateral
Sacrum & Coccyx AP / Lateral
Patient supine (AP) or lateral recumbent.
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AI Patient · KV Sir
How to perform this view
- 01
Ask patient to void.
- 02
Sacrum AP: CR 15 deg cephalad, 5 cm above symphysis.
- 03
Coccyx AP: CR 10 deg caudad, 5 cm above symphysis.
- 04
Lateral: CR to 8-10 cm posterior to ASIS.
- 05
Collimate tightly.
Anatomical & patient position
Patient: Patient supine (AP) or lateral recumbent.
Part: MSP centred; empty bladder and rectum preferred.
Central ray & centring point
Sacrum 15 deg cephalad; coccyx 10 deg caudad; lateral perpendicular.
Exposure factors
kVp
80-90 kVp
mAs
25-40 mAs
SID
100 cm
IR size
24 x 30 cm
Grid
Yes
Respiration
Suspended
Clinical indications
- Coccydynia after fall
- Sacral fracture
Contraindications & precautions
- Pregnancy (relative) - confirm LMP / 10-day rule, justify exposure and shield where possible
Structures shown & evaluation criteria
- Sacrum and coccyx free of foreshortening
- Sacral foramina