Biomedical a

摘要

Abstract: The preceeding paper by von Bally describes a wide range of holographic techniques which may be applied within biomedicine. One of the most promising techniques in terms of research and (potentia) clinical applications was hologram interferometry whereby minute global displacements of surfaces were displayed as contour maps. The noncontact, nondestructive, and high-sensitivity nature of the technique allows studies of even the most delicate specimen. Conventional hologram interferometry is, however, hampered by the necessity of using film or similar media for the registration process. The development introduces a time delay and restricts the sampling rate in the measuring process. TV-holography (ESPI) circumvents these drawbacks by replacing the conventional recording media (film, thermoplastic, etc.) with the photosensitive target of a video-camera. Using analogue or digital electronic processing, the reconstruction process is simulated to give a real-time presentation of interferometric images on the video monitor. The techniques shows promise in the biomedical field, especially as computers are incorporated into the system to aid the operator in analyzing the fringe patterns. The technique and its advantages for biomedical applications are discussed and illustrated with examples of computerized image processing.!13