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Department
of Podiatry
Patient
Positioning for Xrays
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General
view of the X-ray suite, showing the adjustable patient
couch, the X-ray beam apparatus (suspended from the ceiling).
The equipment at the back of the room on the left is the
OPG unit for jaw X-rays. The 'steps' next to it is the Orthoposer,
used to take lateral foot X-rays.
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AP
weightbearing with the subject in normal angle and base
of gait. The red arrow indicates the direction of the X-ray
beam, which is aimed at the navicular. The X-ray unit is
angled 15° from vertical. Click
here for an example of a picture of the film that is
produced.
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Medial
oblique foot weightbearing. The X-ray machine head is
angled at 15°, 30°, 45° or 60° from vertical, with the central
ray aimed at 1st cuneiform. Click here
for an example of a picture of the film that is produced.
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Lateral
weightbearing. The subject is standing on an Orthoposer
box, that elevates the foot enough so that the X-ray beam
can be angled 90° from vertical, and the central ray
directed at the lateral cuneiform. The X-ray film is inserted
into a slot in the Orthoposer such that only half is exposed
for each foot (ie. in this case, to image the right foot,
the subject would turn around 180°, and the film would
be turned upside down so that the unexposed part currently
protected by lead inside the box could be used). Click
here for an example of a picture of the film that is
produced.
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Axial
calcaneal non-weightbearing. The subject is lying on
the adjustable couch, with the film under one heel. The
head of the X-ray unit is angled 45° to the horizontal,
with the central ray aimed at posterior calcaneus. Click
here for an example of a picture of the film that is
produced.
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Axial
calcaneal weightbearing. The subject stands on the film
in the normal and base of gait, and the X-ray beam is directed
towards the posterior calcaneus, angled at 45° to vertical.
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Axial
sesamoid nonweightbearing. The head of the X-ray unit
is angled perpendicular to the ground, with the central
ray aimed at the midline of the foot. Click
here for an example of a picture of the film that is
produced.
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