Abstract: A gas analyser apparatus using laser absorption spectroscopy includes at least two lasers, preferably up to five, six or seven lasers, and a laser housing (6). The at least two lasers are mounted in the laser housing. The laser housing (6) includes a monolithic main body defining an interior space for receiving the lasers and a lid for sealingly closing the main body. The laser housing is arranged within an outer housing of the gas analyser apparatus. This gas analyser can be assembled and adjusted in a quite simple way.

Abstract: A method for analysis and processing of fluorescent images. Fluorescent light is emitted by tumor tissue in an illuminated surgical area detected by an image detection device and is forwarded to an image processing system. After determination of a maximal intensity, the image processing system determines a threshold value as a predefined fraction of the maximal intensity. With basic morphological operations of image processing, limit intensity lines which separate the tumor tissue of intensities above the threshold value and normal tissue of intensities below the threshold value are generated and imaged in a line profile image, wherein the line profile image can be superimposed on the fluorescent image.