Page 201 - A Practical Guide to Equine Radiography

182 A PRACTICAL GUIDE TO EQUINE RADIOGRAPHY

Laterolateral (LL) of the vertebral 7. Centre the X-ray beam approximately
VetBooks.ir bodies (Figs 16.22–16.37) 15–20 cm ventral to the dorsal outline of

the back using these markers as a reference:
1. Stand the horse square with all limbs
equally weight-bearing with the neck in
neutral position and the head resting on − Cranial thoracic vertebral bodies: first
a head stand. Avoid any rotation or tilting marker (Fig. 16.22).
of the trunk. When radiographing the lum- − Mid thoracic vertebral bodies: between
bar vertebral bodies, a sheet of lead can be first and second marker (Fig. 16.23).
placed onto the skin surface of the lumbar − Caudal thoracic vertebral bodies:
region in order to reduce the scatter. between second and third marker (Fig.
2. Place the plate on one side of the trunk in 16.24).
a vertical position in landscape orientation. − Lumbar vertebral bodies: between third
3. Indicate right/left (plate’s side) with a and fourth marker (Fig. 16.25).
marker.
4. Position the X-ray machine on the other 8. Align the field of view with the long axis
side of the body. of the thoracolumbar spine and collimate
5. Focus–film distance: 120 cm. If a grid is around the area of interest.
used, adjust the focus–film distance to the 9. Exposure guide:
distance specified for the grid.
6. Use a horizontal X-ray beam, perpendicular − Thoracic spine: 100 kVp, 50 mAs
to the long axis of the thoracolumbar spine. − Lumbar spine: 120 kVp, 100 mAs.

Figure 16.22 Positioning to obtain
a LL view of the cranial thoracic
vertebral bodies.

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