Exams
Spine

Sacrum / Coccyx

3 default · 0 custom

Quick technique

kVp
75–85
mAs
20–35
SID
40 in
Grid
Yes
Detector
24x30 cm; separate for sacrum and coccyx.
Breath
Suspend on expiration.

Views

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IMAGE RECEPTOR
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Placeholder
Patient position
Supine for AP; lateral recumbent for lateral.
Part position
MSP centered.
Central ray
AP sacrum: 15° cephalic to 2 in superior to symphysis. AP coccyx: 10° caudal to 2 in superior to symphysis. Lateral: perpendicular to mid-coronal plane.
IR placement
24x30 cm; separate for sacrum and coccyx.

TechniqueDefault

kVp
75–85
mAs
20–35
SID
40 in
Grid
Yes
Breath
Suspend on expiration.
Detector
24x30 cm; separate for sacrum and coccyx.

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Anatomy coverage

Sacrum: L5/S1 through coccyx tip. Coccyx: distal sacrum through coccyx.

Tech pearls

  • Have patient void before exam.
  • Lateral: place lead masking behind to absorb scatter.

Image evaluation

  • Sacrum without foreshortening (correct angles)
  • Lateral: sacrum and coccyx not overlapped by femurs

Common mistakes

  • Wrong CR angle direction
  • Not having patient empty bladder
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Anatomy overview

S1–S5Sacral foraminaCoccyxSacroiliac joints
Open region anatomy atlas

Protocol controls

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