![]() the pedicles will be seen in the posterior vertebral body.the zygopophyseal joints will be visible.The pedicles are seen in the anterior half of the vertebral body The locaton of pedicles with correct positioning RPO shows the LEFT intervertebral foramen LAO shows the LEFT intervertebral foramen LPO shows the RIGHT intervertebral foramen RAO shows the RIGHT intervertebral foramen demonstrate the intervertebral foramina furthest from the IR.the intervertebral foramina that are demonstrated are those closest to the IR, so therefore, are sharper and less magnified.less radiation dose to the thyroid than Posterior Obliques.Soft tissues such as an air filled trachea are visualisedĪnterior Obliques are generally preferred as,.Bony trabecular patterns and cortical outlines are sharply defined.Shutter B: Open to show the soft tissue of the neck anteriorly.Shutter A: Open to show the EAMs superioly and the T1 inferiorly.Also the anterior soft tissue of the neck and airway are seen. All of the cervical vertebrae are shown, including the intervertebral foramina, as well as T1.The intervertebral disc spaces are seen open.Correct central ray angulation is evidenced by.No superimposition of the mandible over the cervical vertebrae.Correct positioning of the patient's chin is evidenced by.The pedicles are seen in the anterior half of the vertebral body (see notes below).The intervertebral foramen are open, tear drop shaped and increase in size from C2 down to C7.Correct obliquity (45 degree rotation of the cervical spine) is evidenced by.Angle the patient so that their back and neck make a 45 degree angle with the bucky.Position the patient in an AP position against the upright bucky.Ensure the chin is up slightly to avoid superimposition over the cervical spine.Angle the patient so that their chest and neck make a 45 degree angle with the bucky.Position the patient against the upright bucky in a PA position.Note that the patient should not be moved or asked to move into position in the case of trauma until the possibility of spinal injury has been ruled out. Gonadal (check your department's policy guidelines) Shutter B: Open to include the soft tissue of the neck laterally Shutter A: Open so that the light of the collimated field just includes the top of the ear. Posterior Obliques - 15 degrees cephalad (up)Ĭentre: C4, collimate to the 18 x 24cm film size This larger distance helps overcome the OID (object to image receptor distance) to reduce magnification and improve the sharpness of the image.Īnterior Obliques - 15 degrees caudad (down) ![]() (CR and DR as recommended by manufacturer) Vertebrae of the cervical spine, C1 through to C7, as well as the thoracic vertebra T1, the soft tissues of the neck I think they are really helpful.No superimposition of the mandible over the cervical vertebraeRadiographic Positioning So if you ask the MRI facility that you normally use or you have one yourself, I would really suggest distinguishing yourself from the rest of the units in your area by supplying oblique MRI views of the cervical spine. I think this is a much better representation of the size and how much this disc extrusion occupies the foraminal canal than a standard axial view. And if we take a look at the obliques of the foraminal canal, this is given a much larger appearance of the disc extrusion, and where we’re going to see it located is right there. Now look at how much larger this appears here at the 5/6th level with the oblique views. Let’s just take a look and see what happens when we take a look at an oblique picture. So I don’t think this is such a great revelation in terms of what’s happening in the Foraminal Canal. The radiologists have better equipment and magnification and resolution than I do on this reader, but I have probably the typical kind of reader that most of you all might have as well. And if you keep going again, everything sort of disappears. We can see it’s again smaller, but not really that big. ![]() We take a look at the axial slice, and we don’t really get a great sense of how big it is here. However, if you go to the sides, for example, we can see this protrusion here. Well, it’s got a little bit of protrusion and maybe a little indentation of the myelin, but nothing to write home about. In this case, we have a definite protrusion at cervical 5/6, and we can see it’s here, but we don’t really get a true sense of dimension using the the axial slices. One of the challenges when looking at cervical MRIs is really getting a proper look at the foraminal canals, particularly at the cervical levels 3/4 4/5 5/6, and even 6/7.
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