Coccyx (AP view)

Changed by Andrew Murphy, 3 Jul 2017

Updates to Article Attributes

Body was changed:

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

Patient position

  • the radiograph is performed with the patient in a supine position, with arms placed comfortably by their side, legs extended 1

Technical factors

  • 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

Image technical evaluation

  • 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

Practical points

  • 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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  • -<![endif]--><!--StartFragment--></p><p>The <strong>coccyx AP view </strong>is used to demonstrate the <a title="Coccyx" href="/articles/coccyx">c</a><a href="/articles/coccyx">occyx</a>, in conjunction with the <a title="Sacrum and coccyx (lateral view)" href="/articles/sacrum-and-coccyx-lateral-view-1">s</a><a href="/articles/sacrum-and-coccyx-lateral-view-1">acrum and coccyx (lateral view)</a>. <!--[if gte mso 9]><xml>
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  • -<![endif]--><!--StartFragment-->Follow departmental protocol in relation to imaging this region. </p><h4>Patient position</h4><ul><li>the radiograph is performed with the patient in a supine position, with arms placed comfortably by their side, legs extended <sup>1</sup>
  • +<p>The <strong>coccyx AP view </strong>is used to demonstrate the <a href="/articles/coccyx">c</a><a href="/articles/coccyx">occyx</a>, in conjunction with the <a href="/articles/sacrum-and-coccyx-lateral-view-1">s</a><a href="/articles/sacrum-and-coccyx-lateral-view-1">acrum and coccyx (lateral view)</a>. Follow departmental protocol in relation to imaging this region. </p><h4>Patient position</h4><ul><li>the radiograph is performed with the patient in a supine position, with arms placed comfortably by their side, legs extended <sup>1</sup>
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  • +<li>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 <sup>2 </sup>
  • -<li>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 <sup>1 </sup> <!--EndFragment-->
  • +<li>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 <sup>1 </sup>
  • -</ul><p><!--EndFragment--></p>
  • +</ul><p> </p>

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