Cervical spine (Fuchs view)
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Theclosed mouth odontoid AP view (Fuchs view) is is a nonangled AP radiograph of C1 and C2. This view focuses primarily on the odontoid process. The standard Fuchs view should not be used in a trauma setting and the modified Fuchs view may be used instead.
Patient position
patient is supine or erect
the back of patient's head is placed against the image detector
the patient's chin is angled up 35-40°
X-ray beam featuresTechnical factors
-
the beam travels anterior to posterior (AP) direction, with 0° of angulation, aimed at the odontoid processanteroposterior projection
-
centring point
the beam is aimed just underneath the chin
-
source-to-image distance: 40" (100 cm)collimation
superior to the TMJ
inferior to include C2/3
lateral to include the skin margin
-
orientation
portrait
-
detector size
24 cm x 30 cm
-
exposure
75-80 kVp
at 20 mAs (or AEC)-
grid is used20-25 mAs
-
if the same tilted chin position is maintained, but the patient's face is toward the image detector and the beam travels in a PA direction, this is called theJudd view.SID
100 cm
-
grid
yes (this can vary departmentally)
AdvantagesImage technical evaluation
-
moreThe entire odontoid process should be visibly; free from obscuring anatomy
Practical points
More likely to avoid structures overlapping the odontoid than with the open mouth
odotontoidodontoid view
Disadvantages
-
.
This view
should not be used in a trauma setting (to avoid manipulating a potentially unstable spine)- the modified Fuchs view may be used instead; instead of moving the patient's chin, the beam is angled 35-40° upward and the odontoid is targeted just under the chin (the chin is in a neutral position)
-<p>The <strong>closed mouth odontoid AP view (Fuchs view)</strong> is a nonangled AP radiograph of C1 and C2. This view focuses primarily on the odontoid process. The standard Fuchs view should not be used in a trauma setting and the modified Fuchs view may be used instead.</p><h4>Patient position</h4><ul>-<li>the back of patient's head is placed against the image detector</li>-<li>the patient's chin is angled up 35-40°</li>-</ul><h4>X-ray beam features</h4><ul>-<li>the beam travels anterior to posterior (AP) direction, with 0° of angulation, aimed at the odontoid process</li>-<li>the beam is aimed just underneath the chin</li>-<li>source-to-image distance: 40" (100 cm)</li>-<li>75-80 kVp at 20 mAs (or AEC)</li>-<li>grid is used</li>-<li>if the same tilted chin position is maintained, but the patient's face is toward the image detector and the beam travels in a PA direction, this is called the <strong>Judd view</strong>.</li>-</ul><h4>Advantages</h4><ul><li>more likely to avoid structures overlapping the odontoid than with the open mouth odotontoid view</li></ul><h4>Disadvantages</h4><ul><li>should not be used in a trauma setting (to avoid manipulating a potentially unstable spine)<ul><li>the <strong>modified Fuchs view</strong> may be used instead; instead of moving the patient's chin, the beam is angled 35-40° upward and the odontoid is targeted just under the chin (the chin is in a neutral position)</li></ul>-</li></ul>- +<p>The <strong>closed mouth odontoid AP view (Fuchs view)</strong> is a nonangled AP radiograph of C1 and C2. This view focuses primarily on the odontoid process. The standard Fuchs view should not be used in a trauma setting and the modified Fuchs view may be used instead.</p><h4>Patient position</h4><ul>
- +<li><p>patient is supine or erect</p></li>
- +<li><p>the back of patient's head is placed against the image detector</p></li>
- +<li><p>the patient's chin is angled up 35-40°</p></li>
- +</ul><h4>Technical factors</h4><ul>
- +<li><p><strong>anteroposterior projection </strong></p></li>
- +<li>
- +<p><strong>centring point</strong></p>
- +<ul><li><p>the beam is aimed just underneath the chin</p></li></ul>
- +</li>
- +<li>
- +<p><strong>collimation</strong></p>
- +<ul>
- +<li><p>superior to the TMJ</p></li>
- +<li><p>inferior to include C2/3</p></li>
- +<li><p>lateral to include the skin margin</p></li>
- +</ul>
- +</li>
- +<li>
- +<p><strong>orientation </strong><em> </em></p>
- +<ul><li><p>portrait</p></li></ul>
- +</li>
- +<li>
- +<p><strong>detector size</strong></p>
- +<ul><li><p>24 cm x 30 cm</p></li></ul>
- +</li>
- +<li>
- +<p><strong>exposure</strong></p>
- +<ul>
- +<li><p>75-80 kVp</p></li>
- +<li><p>20-25 mAs</p></li>
- +</ul>
- +</li>
- +<li>
- +<p><strong>SID</strong></p>
- +<ul><li><p>100 cm</p></li></ul>
- +</li>
- +<li>
- +<p><strong>grid</strong></p>
- +<ul><li><p>yes (this can vary departmentally)</p></li></ul>
- +</li>
- +</ul><h4>Image technical evaluation</h4><p>The entire odontoid process should be visibly; free from obscuring anatomy</p><h4>Practical points</h4><p>More likely to avoid structures overlapping the odontoid than with the open mouth odontoid view.</p><p>This view should not be used in a trauma setting (to avoid manipulating a potentially unstable spine) the <strong>modified Fuchs view</strong> may be used instead; instead of moving the patient's chin, the beam is angled 35-40° upward and the odontoid is targeted just under the chin (the chin is in a neutral position).</p>
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