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1. 发明授权

US5351280A Multi-leaf radiation attenuator for radiation therapy 失效
标题翻译：用于放射治疗的多叶辐射衰减器
公开(公告)号：US5351280A
公开(公告)日：1994-09-27
申请号：US71743
申请日：1993-06-09
申请人： Stuart Swerdloff , Thomas R. Mackle , Timothy Holmes
发明人： Stuart Swerdloff , Thomas R. Mackle , Timothy Holmes
IPC分类号： A61N5/10 , C08F234/02 , G21K1/04 , G21K5/04 , G21K5/10
CPC分类号： A61N5/1042 , A61N5/1048 , C08F234/02 , G21K1/04 , G21K1/046 , G21K5/04 , G21K5/10
摘要： A radiation therapy apparatus includes a multi-leaf attenuator having a first plurality of radiation attenuating leaves and a second plurality of radiation attenuating leaves. The first plurality of leaves is spaced with gaps between adjacent leaves within a radiation beam so that the leaves and the gaps therebetween divide the radiation beam into rays. The second plurality of leaves is disposed directly under gaps in the first plurality of leaves so that each ray of the beam can be occluded by a leaf in either the first or second plurality. The gaps eliminate interference between leaves; the staggering prevents radiation leakage between leaves. Each leaf, in both groups, may be moved between a first open state on one side of the beam, a closed state within the beam thus occluding one ray of the beam, and a second open state on the other side of the beam. By controlling the duty cycle of the leaves between the open and closed states, each ray of the beam may be effectively and individually attenuated over a range of intensities. Attenuating the motion between two open states provides more even radiation exposure.
摘要翻译：放射治疗装置包括具有第一多个辐射衰减叶片和第二多个辐射衰减叶片的多叶衰减器。第一组多个叶片与辐射束内的相邻叶片之间的间隙间隔开，使得叶片和其间的间隙将辐射束分成射线。第二多个叶片直接设置在第一多个叶片中的间隙下方，使得束的每个射线可以被第一或第二多个叶片中的叶片遮挡。差距消除叶间的干扰; 惊人的防止叶片之间的辐射泄漏。两组中的每个叶片可以在梁的一侧上的第一打开状态之间移动，光束内的闭合状态，从而遮挡一束光束，在光束的另一侧上移动第二打开状态。通过控制叶片在打开和关闭状态之间的占空比，梁的每个射线可以在强度范围内被有效且单独衰减。衰减两个开放状态之间的运动提供了更均匀的辐射照射。

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