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Citation, DOI & article dataCitation: McWilliam, R., Murphy, A. Sacrum (AP view). Reference article, Radiopaedia.org. (accessed on 13 Sep 2022) https://doi.org/10.53347/rID-49742 The sacrum anteroposterior (AP) view is used to demonstrate the sacrum and its articulations. The efficacy of this radiographic projection is debatable, with radiographers encouraged to follow department protocol when imaging this region 1. On this page:This view can be utilized in the event of trauma, or for evaluating degenerative changes 2 of the sacrum and/or sacroiliac joints.
ReferencesRelated articles: Imaging in practicePromoted articles (advertising)Which central ray angle and direction is recommended for an AP projection of the sacrum?The AP sacrum projection is part of the sacroiliac series that includes an oblique projection (PA/AP) of the joint on both sides. Although usually taken as an AP projection it can also be taken PA with a reverse caudal central ray angulation of 30° to 35° when patients cannot assume supine position 1.
Where does the central ray enter for an anteroposterior AP projection of the cervical spine?The central ray enters at the level of T6 or T7. which of the following anatomic structures is best demonstrated ona right posterior oblique (RPO) cervical spine radiograph? What is the degree and direction of tube angulation for an anteroposterior (AP) axial projection of the sacrum?
Where is the CR centered for an AP axial projection of the sacrum?The CR is centered 1.5 inches inferior to the iliac crest and 2 inches posterior to the ASIS.
Which description applies to a correctly positioned anteroposterior AP projection of the lumbar spine?Which description applies to a correctly positioned anteroposterior (AP) projection of the lumbar spine? The spinous processes are demonstrated in the middle of the vertebral bodies. What are the evaluation criteria for a lateral projection of the skull?
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