WESTFORD, Mass., Oct. 19 -- LightLab Imaging L.L.C. began a first round of human studies of its optical biopsy forceps and the latest generation of its optical coherence tomography (OCT) ultra high-resolution imaging platform. The study, being conducted at Duke University, is focused on detecting precancerous tissues in patients diagnosed with "Barrett's esophagus," and directing the associated tissue biopsies. 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