Production of Technegas and comparison of it with the other agents in ventilation studies

Technegas is a suspension of ultrafine 99Tcm labelled carbon particles produced in an atmosphere of high-quality argon. It is cheap, always available and easy to use, delivers a low radiation dose, and for the most parts, provides good quality lung images. In normal lungs, there was no difference radios in the lungs between Technegas and inhaled 81Krm, 133Xe. Compared with ordinary radioaerosols, it causes fewer and less intense foci of parasitic bronchial activity, and assures good peripheral penetration and alveolar deposition. And Technegas ventilation imaging also has many advantages over other methods, such as X-ray examinations and bronchoscopy