Laser fluorescence bronchoscope for localization of occult lung tumors

A system for imaging occult bronchogenic carcinoma by the fluorescence of previously‐injected, tumor‐specific compound hematoporphyrin‐derivative has been assembled and successfully used to locate a tumor l mm thick. The violet excitation source is a krypton ion laser coupled to fused quartz fiber light conductor. An electrostatic image intensifier attached to a standard flexible fiberoptic bronchoscope provides a bright image even at relatively low irradiance. A red secondary filter rejects most reflected background and autofluorescence. Sensitivity and contrast capability of the system should permit detection of a tumor less than 0.1 mm thick.