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Ultrasound aided regional anesthesia is rapidly becoming a standard of care, with an increase rate of successful nerve blocks and fewer complications. A 2-dimensional (2D) hand-held scan of the brachial plexus is performed prior to needle placement. Physicians need to reorient these 3D pictures in their minds to correspond to the 3-dimensional (3D) structure which is actually being images. Viewing the nerve plexus in three dimensions will increase the ability of physicians to more accurately located and administer local anesthesia. While 3D ultrasound systems exist, they typically are too expensive (>$100K) for widespread employment. The aim of this study is to optically register the movement of the ultrasound transducer during a 2D scan of the brachial plexus and then reconstruct a 3D image with low-cost hardware ($180) and freely available software
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