Page 211 - A Practical Guide to Equine Radiography

192 A PRACTICAL GUIDE TO EQUINE RADIOGRAPHY

Laterolateral (LL) standing in adult − Craniodorsal: in the dorsal third of a
VetBooks.ir horses (Figs 17.1–17.9) line between the most caudal aspect of

the scapula and the olecranon or in the
1. Stand the horse square with all limbs
th
equally weight-bearing. Avoid any rotation dorsal third of the 4 intercostal space
or tilting of the body. − Cranioventral: 10 cm caudal to the shoul-
2. Place the plate on one side of the thorax in der joint or in the middle third of the
nd
rd
a vertical position in landscape orientation, 2 –3 intercostal spaces
except for the cranioventral projection, − Caudodorsal: in the dorsal third of the
th
where the plate is usually placed in portrait 11 intercostal space
orientation. − Caudoventral: in the middle third of the
th
th
3. Indicate right/left (plate’s side) with a marker. 6 –7 intercostal spaces.
4. Position the X-ray machine on the other
side of the body. 8. Collimate to the edge of the plate.
5. Focus–film distance: 120 cm. If a grid is 9. Exposure guide:
used, adjust the focus–film distance to the
distance specified for the grid. − Craniodorsal and caudoventral: 80 kVp,
6. Use a horizontal X-ray beam, perpendicular 30 mAs
to the long axis of the trunk. − Cranioventral: 110 kVp, 50 mAs
7. X-ray centring depends on the quadrant − Caudoventral: 90 kVp, 40 mAs.
(Fig. 17.1):

C
A

B D

Figure 17.1 Representation of the four quadrants of the thorax: craniodorsal (A), cranioventral (B),
caudodorsal (C) and caudoventral (D).

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