Coccyx (AP view)

The coccyx AP view is used to demonstrate the coccyx, in conjunction with the sacrum and coccyx (lateral view). Follow departmental protocol in relation to imaging this region. 

  • the radiograph is performed with the patient in a supine position, with arms placed comfortably by their side, legs extended 1
  • AP view
  • centring point
    • 5 cm superior to the pubic symphysis at the MSP 1
  • central ray
    • angled 10 degrees caudal 1
  • collimation
    • must adhere to the ALARA principle given the region exposed via the primary beam
    • close collimation to the area of interest
  • orientation  
    • portrait 
  • detector size
    • 24x30 cm 
  • exposure
    • 80 kVp
    • 15 mAs 
  • SID
    • 110 cm
  • grid
    • yes
  • adequate penetration should clearly demonstrate the coccyx region
  • the coccyx is free of superimposition from the pubic rami
  • lateral margin of the coccyx is equidistant from the pelvic brim indicating no patient rotation
  • given the proximity of this anatomy to the gonadal region, risk versus  benefit of ionising radiation and diagnostic value should be considered before imaging occurs 2
  • if imaging is required, the urinary bladder and large colon should be emptied before this examination to minimise superimposition of structures over the coccyx region 1

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Article Information

rID: 50202
Section: Radiography
Tag: snippet
Synonyms or Alternate Spellings:

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