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Proceedings Paper

Contour Transfer Using A Microprocessor-Controlled Laser Scanner
Author(s): Xunliang Liu; Don P. Ragan
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Paper Abstract

A contour transfer device has been developed to project a computer designed shape onto the surface of a radiotherapy patient. The device consists of a He-Ne laser, an optical system with a 2-D scanner and a scanner driver with microprocessor control. The X-Y scanning is accomplished by using a twin-mirror deflector; the scanning pattern is a function of the rotated angles of the mirrors. A program is proposed to calibrate the device and interpret the computerized contour so that the drawing pattern of the device can precisely reproduce the computer data. The device we developed is a versatile instrument with a number of applications in auto-drawing areas. It is to be used to project the intended treatment field of a radiotherapy patient onto the patient. This is the critical last step needed to utilize a computerized tomography (CT) scanner for radiotherapy treatment planning. The device is constructed in a compact fashion and will be mounted on the gantry of the CT scanner with the following technical parameters: (1) maximum scanning field is 30 cm by 30 cm on a 20-25 cm thick patient, (2) frame rate is greater than 25 frames/S, and (3) random error is within + 1 mm.

Paper Details

Date Published: 30 January 1990
PDF: 13 pages
Proc. SPIE 1153, Applications of Digital Image Processing XII, (30 January 1990); doi: 10.1117/12.962338
Show Author Affiliations
Xunliang Liu, Wayne State University (United States)
Don P. Ragan, Wayne State University (United States)

Published in SPIE Proceedings Vol. 1153:
Applications of Digital Image Processing XII
Andrew G. Tescher, Editor(s)

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