Positioning Sternal recumbency, forelimbs extended cranially Ensure not rotated - ensuring the head is straight can help Position over the 6th thoracic vertebrae, in the midline Collimate to include the entire chest (including the diaphragm) Expose on full inspiration Ensure L/R marker in primary beam. What to look for Ensure spine and sternum are superimposed Try to ensure no positioning aids are under the chest. Top tips For deep chested dogs it can help to rest their head on foam pads or a sand bag It can be a good idea to hold the X-ray trigger on prep while you watch for full inspiration, then the exposure will occur when you want it, not a few seconds later