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These studies aim to evaluate respiratory muscle function in childhood by observing regional motions of the body surface during breathing. The stereophotogrammetric analysis of biological forms in medicine has been usefully employed for many years. Generally the methods previously adopted have involved the measurement of conventional photographs in comparators. Although these methods have proved successful, the procedures are very time consuming and this severely restricts their application to physiologic studies. The authors have developed a real time system for capturing dynamic pictures of the breathing cycle of patients using a pair of video-cameras, a two channel split screen vision controller and a video-cassette recorder with digital storage and effects, all mounted on a costum built hospital cot. The images to be meaured are selected by viewing the split screen in dynamic stereoscopic mode and selected images are captured on an IBM personal computer equipped with video frame grabbers.