Technegas - a new ventilation agent for lung scanning

Abstract

A simple process using technetium-99m generator eluate in a graphite crucible at 2500° C, produces a structured ultra-fine dispersion of labelled carbon. Particle sizes are 5.0 run (0.005μm) and less and adhere to the walls of the alveoli on inhalation. Penetration characteristics are gas-like and the radioactivity per litre of carrier argon allows single breath inhalations of a diagnostic dose. Over 190 patients have been studied including 50 within a formal clinical trial with xenon-133. Results of tomography, dynamic inhalation, and image subtraction using this new agent-'Technegas' - are presented.