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1. 发明授权

US5867555A Adaptive dose modulation during CT scanning 失效
标题翻译： CT扫描期间的自适应剂量调制
公开(公告)号：US5867555A
公开(公告)日：1999-02-02
申请号：US811338
申请日：1997-03-04
申请人： Stefan Popescu , Dietmar Hentschel , Karl-Ernst Strauss , Heiko Wolf
发明人： Stefan Popescu , Dietmar Hentschel , Karl-Ernst Strauss , Heiko Wolf
IPC分类号： A61B6/03 , G01N23/04
CPC分类号： A61B6/542 , A61B6/032 , G01N23/046 , A61B6/027 , G01N2223/419 , G01N2223/612
摘要： In a method for reducing a radiation dose in an x-ray CT (computed tomography) system, a maximum x-ray attenuation per projection is computed for every projection or for every n.sup.th projection and the measured angular attenuation profile for a last half rotation of the x-ray beam around a subject is stored, an extrapolation method is conducted for computing an extrapolated attenuation profile for a next half rotation based on the measured angular attenuation profile for the last half rotation, and a process is conducted for setting a dose level for the x-ray beam for a next projection, based on the extrapolated attenuation profile. The x-ray beam can be modulated, with characteristics of the beam modulation being set or controlled dependent on the extrapolated attenuation profile.
摘要翻译：在用于减少X射线CT（计算机断层摄影）系统中的辐射剂量的方法中，针对每个投影或每第n个投影计算每个投影的最大x射线衰减，以及针对每个投影的最后半个旋转的测量的角衰减曲线存储被摄体周围的X射线束，进行外插法，用于基于所测量的下一半旋转的角衰减曲线计算下一半旋转的外推衰减曲线，并且进行用于设定剂量水平的处理对于用于下一个投影的X射线束，基于外推衰减曲线。可以调制x射线束，其特征在于根据外推衰减曲线来设置或控制波束调制。

2. 发明授权

US4934832A Computer tomography apparatus with resiliently mounted radiation detector 失效
标题翻译：具有弹性安装辐射探测器的计算机断层摄影装置
公开(公告)号：US4934832A
公开(公告)日：1990-06-19
申请号：US354207
申请日：1989-05-19
申请人： Karl-Ernst Strauss
发明人： Karl-Ernst Strauss
IPC分类号： G01N23/04 , A61B6/03
CPC分类号： A61B6/035 , A61B6/4021 , A61B6/4078
摘要： A computer tomograph apparatus of the type having a rotating frame which carriers an x-ray source and a radiation detector includes a mount for the radiation detector which resiliently seats the radiation detector on the rotating frame permitting slight displacement of the radiation detector in a direction tangent to the orbit of the detector around a patient. The resilient mounting of the radiation detector suppresses the transmission of mechanical jolts and other jarring forces from the rotating frame to the detector. Because of the resilient mounting, the weight of the radiation detector will cause a slight dislocation of the detector during a revolution. To compensate for this dislocation the rated position of the focus is determined dependent upon the detector position, so that the position of the focus can be adjusted corresponding to this detector displacement.
摘要翻译：具有携带X射线源和放射线检测器的旋转框架的类型的计算机断层摄影装置包括用于辐射检测器的安装件，其将辐射检测器弹性地安置在旋转框架上，允许放射线检测器在正切方向上的轻微位移到达患者周围的探测器轨道。辐射检测器的弹性安装可以抑制机械颠簸和其他振动力从旋转框架传递到检测器。由于弹性安装，辐射检测器的重量将导致检测器在转动期间轻微的位错。为了补偿这种错位，焦点的额定位置取决于检测器位置，从而可以根据该检测器位移来调整焦点的位置。

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