-
公开(公告)号：US3996467A
公开(公告)日：1976-12-07
申请号：US577625
申请日：1975-05-15
CPC分类号： A61B6/032 , A61B6/54 , G06T11/005 , Y10S378/901
摘要： In an apparatus for examining a body with penetrating radiation a source and detector arrangement scan about the body to irradiate the body along a plurality of beam paths lying in a plane. Output signals are provided from weighted components where each component relates to the absorption of the radiation along one of a set of adjacent and substantially parallel beam paths. The weighting is according to a function chosen so that the output signals are restricted to a chosen spatial frequency band to reduce errors in a representation, if the distribution of absorption of the radiation through the body, constructed from the output signals. The weighting may be provided by optical means between scintillator crystals and photomultipliers forming the detector arrangement.
摘要翻译： 在用于检查具有穿透辐射的身体的装置中，源和检测器布置围绕身体扫描以沿着位于平面中的多个光束路径照射身体。 输出信号由加权分量提供，其中每个分量涉及沿着一组相邻和基本上平行的光束路径的辐射的吸收。 加权根据所选择的功能，使得输出信号被限制到所选择的空间频带，以减少由输出信号构成的通过身体的辐射的吸收分布的表示中的误差。 可以通过形成检测器装置的闪烁体晶体和光电倍增管之间的光学装置来提供加权。
-
公开(公告)号：US4081681A
公开(公告)日：1978-03-28
申请号：US755629
申请日：1976-12-30
CPC分类号： A61B6/483 , A61B6/032 , G06T11/005 , H05G1/66 , A61B6/4028 , A61B6/548 , Y10S378/901
摘要： A computerized tomographic apparatus is disclosed, as well as a method of operating such apparatus. In circumstances where collimation between the body under examination and the radiation-sensitive detector means is difficult to apply, errors in evaluated absorption coefficients for locations distributed over a cross-sectional slice of the body due to scatter within the slice are reduced by producing a first estimate of the distribution of said absorption coefficients, using this estimate to obtain an indication of the amount of scatter likely to arise from the various locations when irradiated along different paths and using such indication to effect scatter compensation.
摘要翻译： 公开了一种计算机断层摄影装置，以及操作这种装置的方法。 在难以应用检查体和辐射敏感检测器装置之间的准直的情况下，由于片内散射而分布在身体的横截面切片上的位置的评估吸收系数的误差通过产生第一 估计所述吸收系数的分布，使用该估计来获得当沿不同路径照射时可能由各种位置产生的散射量的指示，并且使用这种指示来实现散射补偿。
-
公开(公告)号：US4118631A
公开(公告)日：1978-10-03
申请号：US781409
申请日：1977-03-25
CPC分类号： A61B6/032 , A61N5/1049 , A61N2005/1054 , A61N5/107
摘要： In therapeutic radiographic apparatus it is desirable to maintain the penetrating radiation in passing through tissue to be irradiated, rather than surrounding healthy tissue, despite movements of the patient. A shadowgraph radiographic picture of part of the patient is obtained by derivation from cross-sectional radiographic pictures from computerized axial tomography (CAT) apparatus. A similar shadowgraph picture is obtained, during therapy treatment, by collecting the therapy radiation after passing through the body. The two pictures are compared to determine the position of the therapy radiation relative to the tissue to be irradiated and the position is adjusted in response to the comparison.
摘要翻译： 在治疗性射线照相设备中，尽管患者的运动，仍然希望将穿透性辐射保持穿过待照射的组织而不是周围的健康组织。 通过从计算机化轴向断层摄影（CAT）装置的横截面放射照相图像推导得到患者部分的阴影照相图像。 在治疗期间，通过在通过身体后收集治疗辐射，获得了类似的阴影图。 将两张照片进行比较以确定治疗辐射相对于被照射组织的位置，并根据比较来调节位置。
-
公开(公告)号：US4084094A
公开(公告)日：1978-04-11
申请号：US698225
申请日：1976-06-21
CPC分类号： A61B6/032
摘要： In a scanning radiographic apparatus, of a type which is particularly suitable for examining inanimate objects, a fixed source and detectors irradiate an object to be examined along a plurality of beam paths. The object is moved in relation to the source and detectors to direct the radiation along a sufficient number of beam paths to allow suitable processing. The object is, for that purpose, mounted on a turntable which can also execute a reciprocating lateral motion relative to the source and detectors.
摘要翻译： 在特别适用于检查无生命物体的扫描放射线照相设备中，固定光源和检测器沿着多个光束路径照射被检测物体。 物体相对于源和检测器移动以沿着足够数量的光束路径引导辐射以允许适当的处理。 为此，目的是安装在转盘上，转台也可以相对于源和检测器执行往复横向运动。
-
-
-
搜索结果
4 条记录 (耗时 0.017 秒)
