Page 171 - A Practical Guide to Equine Radiography

152 A PRACTICAL GUIDE TO EQUINE RADIOGRAPHY

Right 30º dorsal-left ventral oblique 3. Indicate right/left (plate’s side) with a
VetBooks.ir (R30D-LVO) and Left 30º dorsal- 4. Position the X-ray machine on the other
marker.
right ventral oblique (L30D-RVO)
for maxillary cheek teeth (Figs side of the head.
14.25–14.27) 5. Focus–film distance: 100 cm.
1. Position the head straight (avoid tilting or 6. Angle the X-ray beam, so that the X-ray
rotation) with the nose vertical with the beam hits the dorsal plane (hard palate) at
help of a head stand. Alternatively, the head a 30-degree downward angle. Alternatively,
can be stretched out so that the nose is hori- the X-ray beam can be angled downwards
zontal. Both ways standardize head position 75 degrees when evaluation of the parana-
and help to angle the beam correctly. sal sinuses is required.
2. Place the plate on the affected side in a ver- 7. Centre the X-ray beam dorsal to the rostral
tical position and aligned with the area of third of the facial crest.
interest. 8. Align the field of view with the long axis
of the nose by tilting the X-ray machine if
– R30D-LVO: outlines the left-sided max- necessary and collimate around the area of
illary cheek teeth and paranasal sinuses. interest.
– L30D-RVO: outlines the right-sided max- 9. Exposure guide: 65 kVp, 20 mAs.
illary cheek teeth and paranasal sinuses.

A B

Figure 14.25 Diagram (A) and positioning (B) to obtain an R30D-LVO view of the head that outlines the left-
sided maxillary cheek teeth and paranasal sinuses.

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