| 摘要 |
In conjunction with a linear accelerator or a cobalt-60 teletherapy machine disposed in a room having a head mounted for rotation about a horizontal epicenter axis, and wherein the head is adapted to direct a high energy beam at right angles to and intersecting said axis at an isocenter, there is provided right-angularly related opposed pairs of side and vertical lasers whose beams are focused upon said isocenter. This is to assure that when an isolated area of a patient's body to be treated is located at said isocenter, with the side and vertical laser beams impinging upon said isolated area, that high energy beams will at all times pass into said isolated area, as the radiation head is rotated up to 360 degrees about said epicenter axis. The present laser alignment fixture includes a support base adjustably mounted upon a universally adjustable patient platform. A turntable on said support base has a visual alignment fixture mount with top, bottom and side walls and a longitudinal bore. The visual alignment fixture having a longitudinal axis perpendicular to the mount walls is nested in said bore and, on adjustment of said platform, its axis is adapted for visual alignment with the epicenter axis of the machine. In the first embodiment, the visual alignment fixture is a telescope. In the second embodiment, the alignment fixture is a laser tube, permitting direct measurement of any misalignment.
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