Page 158 - A Practical Guide to Equine Radiography

HEAD 139

Laterolateral (LL) (Figs 14.1–14.9)
VetBooks.ir 1. Position the head with the nose vertical

with the help of a head stand (or bale of
shavings, etc., if no headstand available).
Avoid any tilting or rotation of the head.
Extension of the head and neck may facili-
tate the evaluation of the pharyngeal and
laryngeal region.
2. Place the plate on the affected side in a vertical
position and align with the area of interest.
3. Indicate right/left (plate’s side) with a marker.
4. Position the X-ray machine on the other
side of the head. Figure 14.1 Positioning to obtain a LL view of the
5. Focus–film distance: 100 cm. rostral aspect of the head.
6. Use a horizontal X-ray beam, perpendicular
to the long axis of the head and plate.
7. X-ray beam centring depends on the area
of interest:

− Rostral head: corner of the mouth (Fig.
14.1)
− Paranasal sinuses: dorsal to the rostral
third of the facial crest (Fig. 14.2)
− Caudal head: middle third of the caudal
border of the mandibular ramus (Fig.
14.3).

8. Align the field of view with the long axis of
the nose for the rostral head and paranasal Figure 14.2 Positioning to obtain a LL view of the
sinuses and collimate around the area of head at the level of the paranasal sinuses.
interest.
9. Exposure guide:

− Rostral head and paranasal sinuses: 60
kVp, 15 mAs
− Caudal head: 70 kVp, 40 mAs.

Figure 14.3 Positioning to obtain a LL view of the
caudal aspect of the head.

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