Application Of Moire Patterns For Obtaining Surface Contour Information On Patients Receiving Radiotherapy (original) (raw)

Three-Dimensional Machine Perception, 1981

Abstract

ABSTRACT Three-dimensional surface contour information is important for selective patients requiring radiation therapy. The patient contour is used to calculate the radiation dose distribution within the irradiated volume. A Moire photographic contouring device has been constructed to obtain these surface contours. The device consists of two light sources to project a grid pattern on the skin of the patient, and a camera with Polaroid back to photograph the image of the interference pattern on the skin. The interference fringes, as well as the patient's surface, is recorded on the photograph. Tissue thickness can be determined within 2.5 mm. It takes only a few minutes to get the contouring photograph. In addition to using the surface contour data for calculations of dose distributions, it can also facilitate construction of tissue compensators.

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