| 摘要 |
<p>An adjustable X-ray examination apparatus (24, 26) comprises an auxiliary element (38), for example a weight or a gas spring, in order to compensate for forces generated during operation of drive mechanism formed by parallelogram arms (16, 18, 20, 22). The forces increase with the amount of excursion from a neutral position. The auxiliary element may be mounted and adjusted so that, for the whole range, the positioning of the X-ray examination apparatus can be performed by a substantially constant external force.</p> |
