[en] Pulmonary edema induced by injections of oleic acid was demonstrated using ¹¹¹In-chloride lung/heart image in five anesthetized dogs. The anesthetized dogs were positioned under a gamma camera interfaced to a computer. After ¹¹¹In-chloride IV injections, dynamic data were recorded at 1 frame/min before and after induced pulmonary edema. The computer generated the curve of the lung-to-heart activity ratio; the ratio rose from 0.5-0.6 at baseline to 0.85-1.5 at th end of the study in the dogs. At the end of each study, the removed lungs demonstrated edematous fluid, and a few red blood cells were seen in the alveoli. The results indicating pulmoinary edema exhibited in the ¹¹¹In-chloride lung-to-heart ratio obtained froma computerized gamma camera were compatable with the pathological results. Since ¹¹¹In-chloride instantly binds to plasma transferrin, an excellent intravascular imaging agent, leakage of this tracer into alveoli indicates loss of membranous wall competence. Pulmonary edema, as in the adult respiratory distress syndrome, is sometimes difficult to diagnose; and this ¹¹¹In-chloride lung-to-heart imaging technique may be potentially useful. (orig.)