Dr. D.J. Lee and Ph.D student Xiaoqian Xu, along with S.K. Antani, L.R. Long, and G.R. Thoma of the National Library of Medicine presented ""Relevance Feedback for Shape-based Pathology in Spine X-ray Image Retrieval"" at SPIE Medical Imaging, Picture Archive and Communication Systems (PACS) and Imaging Informatics. The Conference was held Feb. 11-16 in San Diego, CA.