Page 43 - A Practical Guide to Equine Radiography

24 A PRACTICAL GUIDE TO EQUINE RADIOGRAPHY

Dorsoproximal-palmarodistal oblique 5. Position the foot being imaged on a tunnel
VetBooks.ir (DPr-PaDiO) (Figs 4.13–4.20) 6. Position the contralateral foot on a flat
block.
This projection is performed twice, once to
image the navicular bone and once to image block.
the distal phalanx. Different centring and expo- 7. Place the plate facing upwards in the tunnel
sures are used in each projection. block.
Two different methods can be used to obtain 8. Place a R/L marker on the lateral side of the
DPr-PaDiO projections: plate.
9. Position the X-ray machine dorsoproxi-
• High coronary technique: the horse’s foot mally to the foot.
stands on a tunnel block and the X-ray beam 10. Focus–film distance: 100 cm.
is angled downward 65 degrees from the hor- 11. Angle the X-ray beam 65 degrees downward
izontal (Fig. 4.10). from the horizontal.
• Upright pedal technique: the horse’s foot is 12. Centre the X-ray beam in the midline of the
positioned with the toe pointing downwards hoof at:
on a Hickman/Oxspring block and a hori- − The coronary band for the distal phalanx
zontal X-ray beam is used (Fig. 4.11). − 1 cm above the coronary band for the
navicular bone.
High coronary technique 13. Collimation:
1. Remove shoes. − Around the foot for the distal phalanx
2. Remove dirt and any loose horn from the − Around the navicular bone for the navic-
sole. ular bone.
3. Pack the foot with Play-Doh. 14. Exposure guide:
4. Stand the horse square with the cannon bone − Distal phalanx: 65 kVp, 8 mAs
vertical to the ground in each direction, and − Navicular bone: 70 kVp, 10 mAs.
ensure all limbs are equally weight-bearing.

Figure 4.13 Positioning to obtain a DPr-PaDiO view of the
foot using a high coronary technique.

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