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Blowing in the wind: How accurate is thermography of horses' legs?
Date:3/27/2013

Since its introduction fifty or so years ago, thermography has been increasingly used by vets to pinpoint the cause of lameness in horses. The method is fast and safe and is based on a simple idea. The horse's body surface emits infrared radiation that can be detected by an infrared camera, which is both easy and inexpensive to use. The camera produces a coloured image that shows the variation in surface temperature across the area investigated. The temperature is directly related to the presence of blood vessels near the skin, so the method can detect local inflammatory lesions or regions of modified blood flow and thus help localize the origin of lameness.

The theory is clear but to date there have been comparatively few investigations into the reliability of the method. Furthermore, it is important to note that in practice trivial matters such as time constraints and movement of the horse can cause changes in both camera angle and distance of the camera to the area of the horse being investigated. The effect to which these changes affect the results of thermographic imaging is unknown. Finally, although it is generally accepted that thermographic imaging of horses should be performed in draught-free surroundings, there have not been any published studies on the effect of airflow on the results.

These issues have now been tackled by Simone Westermann of the Clinical Unit of Equine Surgery at the University of Veterinary Medicine, Vienna, together with colleagues at the University of Veterinary Medicine, Vienna (Vetmeduni Vienna) and with Adrian Ion at the Vienna University of Technology. The scientists found that the method was highly reproducible and was less sensitive to variations in camera position and angle than might be expected. In fact, the results were almost completely unaffected by 20 changes in camera angle and increases of up to 50 cm in the distance of the camera from the animal. At a distance of 1 m from the horse a
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Contact: Simone Westermann
simone.westermann@vetmeduni.ac.at
43-680-405-1605
University of Veterinary Medicine -- Vienna
Source:Eurekalert

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