Page 115 - A Practical Guide to Equine Radiography

96 A PRACTICAL GUIDE TO EQUINE RADIOGRAPHY

Mediolateral (ML) (Figs 10.1–10.4) 5. Focus–film distance: 100 cm. If a grid is
VetBooks.ir 1. Pull the leg forward with gloved hands as used, adjust the focus–film distance to the

distance specified for the grid.
far as possible to prevent superimposition
of the contralateral shoulder and raise the 6. Use a horizontal X-ray beam perpendicu-
head and neck to avoid superimposition of larly aligned to the leg and plate.
the cervical spine over the distal aspect of 7. Centre the X-ray beam on the trachea,
the scapula. Ideally, the trachea would be approximately 5–10 cm in front of the
superimposed over the shoulder joint to distal end of the scapular spine of the con-
increase contrast. tralateral limb.
2. Place the plate in portrait orientation on the 8. Collimate tightly around the shoulder to
lateral side of the shoulder. reduce scatter.
3. Place a R/L marker on the dorsal side of the 9. Exposure guide: 90 kVp, 40 mAs.
plate.
4. Position the X-ray machine on the other
side of the horse. The X-ray beam will be
directed under the neck of the horse.

Figure 10.1 Positioning to obtain a ML view of the shoulder.

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