![]() ![]() ![]() ![]() In addition, thoracic radiographic images should be obtained while the animal is in the peak inspiration phase of respiration. Therefore, when attempting to assess a pulmonary lesion, a view which places the pulmonary region of concern in the most nondependent position is best for evaluation. The down side, or dependent lung decreases in volume due to atelectasis when a patient is in recumbency for even short periods of time. When attempting to characterize a pulmonary lesion, the lesion is best defined when surrounded by well-aerated lung. In general, the position of the cardiac silhouette is most consistent on a right lateral projection. The appearance of the thorax will vary slightly when comparing left and right lateral thoracic radiographs, and dorsoventral and ventrodorsal radiographs because of variable magnification artifacts associated with patient position. For routine evaluation of the thorax, either a right or left lateral projection, and a dorsoventral or ventrodorsal projection of the thorax are required.īecause the thoracic viscera are asymmetrically positioned, the appearance of the diaphragm changes with patient position. As has been stated before, at least 2 orthogonal views of the thorax are required for complete and accurate interpretation. The normal thorax is well suited to radiographic evaluation because there is marked inherent contrast between the air-filled, fluid-filled, soft tissue, and bony structures that comprise the thoracic viscera and thoracic wall. ![]()
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