EVER since Jackson,1 more than 30 years ago, first began the instillation of bismuth subcarbonate into the tracheobronchial tree so as to outline its anatomy by x-ray, medical men everywhere have made efforts to improve the technique of bronchography.
The first major step was made in 1921, when Sicard and Forestier2 introduced a contrast medium which was radiopaque, nontoxic, and was absorbed by the lung. This was called iodized oil (Lipiodol). Since then, until within the past few years, iodized oil or chloriodized oil (Iodochlorol) has been used exclusively as the contrast medium introduced into the tracheobronchial tree.
Recently a water-soluble contrast medium has been introduced, which may supplant iodized oil. However, comparison and evaluation of these two substances will be discussed later.
Sommerfield3 in 1942 stated that there are five primary methods of bronchographic technique:
Supraglottic, or laryngeal