Page 158 - A Practical Guide to Equine Radiography
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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.











       Equine Radiography.indb   139                                                                             27/11/2018   11:11
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