Airway Identification Within Planar Gamma Camera Images

*Author to whom correspondence should be addressed. Tel: +1-919-541-7875; fax: +1-919-541-4284; e-mail: martonen.ted@epa.gov 1Curriculum in Toxicology, University of North Carolina, Chapel Hill, NC 27599, USA; 2National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA; 3GlaxoSmithKline Research and Development, Stockley Park, Uxbridge, Middlesex, UK; 4IBM Corporation, Research Triangle Park, NC 27709, USA