PHILLIP M. BOISELLE is Section Chief of Thoracic Imaging, Associate Radiologist-in-Chief of Administrative Affairs of the Department of Diagnostic Radiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts and is also an Associate Professor of Radiology, Harvard Medical School, Boston, Massachusetts. Dr. Boiselle received his M.D. from Duke University, Durham, North Carolina, completed his residency training at Yale University, New Haven, Connecticut, and obtained his fellowship training at the Massachusetts General Hospital in Boston, Massachusetts. CHARLES S. WHITE is Vice Chairman of Radiology and Professor of Radiology and Medicine, University of Maryland Medical Center, Baltimore. Dr. White received his M.D. From State University of New York, Buffalo, and completed his residency in both Internal Medicine and Radiology from the Columbia-Presbyterian Medical Center, New York.