Light Sectioning as a Three-Dimensional Measurement System in Medicine

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Abstract
Light sectioning is a monophotogrammetric method of measuring subjects in three dimensions consisting of contouring the object optically by a series of slits of light of equal size and frequency. The contour plot is recorded photographically at 90° to the projection axis. A double-sided system has been developed for medical applications which is free from geometric distortion caused by the conical nature of the projection and recording beams. An explanation of such errors is given. The use of mirrors and telecentric systems to reduce the errors below significant levels is discussed, as is the production of fine line black and white and colour grids. The practical problems are mentioned and the errors of the working system found. Examples of applications to medical problems are given. The advantages of the method are that it is non-contact, instantaneous, simple and inexpensive to operate and requires a minimum of sophisticated equipment or technique. Its principal disadvantage is that it cannot be used on concave body surfaces.

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