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Citation, DOI & article dataCitation: Nguyen, M., Murphy, A. Cervical spine (PA oblique view). Reference article, Radiopaedia.org. (accessed on 08 Sep 2022) https://doi.org/10.53347/rID-51499 The PA oblique cervical spine projections are supplementary views to the standard AP, odontoid and lateral images in the cervical spine series and are always done bilaterally for comparison purposes. The PA oblique projection is preferred as it reduces radiation dose to the thyroid 1, compared to the AP oblique projection. On this page:This projection can be used to visualize pathology involving the adjacent soft tissue structures or cervical spine, especially stenosis of the intervertebral foramina. Note: Such views should not be performed on trauma patients without the strict instructions of a qualified clinician who has reviewed the lateral cervical spine image or CT of the cervical spine. Moving the patient's head or neck, or removing a cervical collar could be detrimental.
Correcting rotational errorsTo demonstrate the intervertebral foramen of the c-spine open, it is necessary to achieve adequate rotation of the vertebral column, usually at 45°. If underrotated, the foramina will be narrowed and a sternoclavicular joint would be superimposed over the vertebral column 3. Over rotation of more than 45° would cause one pedicle to be foreshortened while the other pedicle aligns to the midline of the vertebral bodies 2. ReferencesRelated articles: Imaging in practicePromoted articles (advertising)What is the central ray angle for the PA axial oblique projection of the cervical spine?C-Spine positioning. How much is the body rotated for a PA axial oblique projection of the cervical intervertebral foramina?To demonstrate the intervertebral foramen of the c-spine open, it is necessary to achieve adequate rotation of the vertebral column, usually at 45°. If underrotated, the foramina will be narrowed and a sternoclavicular joint would be superimposed over the vertebral column 3.
What is the proper Cr angle and direction for the AP oblique projections of the cervical spine?For the oblique view of the cervical spine, the patient may be erect or recumbent. The patient is rotated 45° to the left, to demonstrate the right-side neural foramina. The CR is directed to the C-4 vertebra with 15°-20° cephalad angulation.
What is the central ray centering point for an AP oblique lumbar spine?What is the central-ray centering point for an AP oblique lumbar spine? 2 inches medial to the elevated ASIS and 1 1/2 inches above the iliac crests. If the lumbar spine cannot be adjusted so it is horizontal for the lateral projection, the central ray should be angled: 5 degrees men, 8 degrees women - caudad.
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