1980s, DLCO, Helium Dilution FRC, Spirometer Collins DS Plus, circa 1985 June 23, 2014 Richard Johnston Leave a comment Performed spirometer, helium dilution lung volumes and single-breath DLCO. Photo is from a sales brochure courtesy of James Sullivan, BA, RPFT, Supervisor, Pulmonary Laboratories, Memorial Sloan Kettering Cancer Center.