18 research outputs found
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Surface contouring with a range finder
New patients at the Neutron Therapy Facility must be contoured so that the staff might offer safe and effective treatment. A new system using the lasers and rotating chair that are in the treatment room, a range finder that projects a scale, a contour board marked with polar coordinates, and a swing scale has been implemented. This system significantly improves the accuracy of the contours drawn and should prove to be a time saver in difficult contours, such as those found about the head. Patients will benefit in that the contouring process will be more efficient and accurate. This system may be of use in other situations at Fermilab needing surface contouring through a cross section. Its scale is marked in whole units, and requires low background light conditions to be seen. Modification of the geometry of NTF's system can change the spacing of marks on the scale, but readings would no longer be in 1 cm units, and would require a conversion factor to draw a contour at full scale. The range finder is accurate at distances less than 55 cm from the isocenter. 6 figs