| 摘要 |
In a mini C-arm x-ray imaging system in which an x-ray source (22) and detector (23) are mounted at opposite ends of a C-shaped track (32) which is supported for sliding orbital movement along its axis of curvature for positioning the source and detector in relation to an object (30) to be imaged, a locking mechanism including a brake shoe bearing against the track, a screw and nut carried by the track-supporting structure (54) for moving the shoe toward and away from the track, a resilient bias acting between the shoe and the screw to urge the shoe toward the track, a handle (60) for turning the screw to move the shoe and a detent acting between the handle and the support structure to provide a plurality of discrete settings for the handle, respectively representing incrementally different forces exerted by the shoe against the track.
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