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    • 6. 发明授权
    • Transmission attenuation correction method for PET and SPECT
    • PET和SPECT传输衰减校正方法
    • US06429434B1
    • 2002-08-06
    • US09398497
    • 1999-09-17
    • Charles C. WatsonStephen D. MillerRonald NuttMichael E. CaseyJames J. Hamill
    • Charles C. WatsonStephen D. MillerRonald NuttMichael E. CaseyJames J. Hamill
    • G01T1166
    • G01T1/2985A61B6/037G01T1/1648G21K1/02
    • A transmission source serves to detect activity from a radiation source for correcting attenuation in either PET mode or SPECT mode. The transmission source includes a detector dedicated to collecting attenuation data in PET mode. A collimated radiation source and a detector are positioned with respect to a tomography device such that only a selected strip of the imaging detector of the tomograph is illuminated such that events unrelated to the attenuation are eliminated. The transmission source can either be a coincidence transmission source or a singles transmission source and includes a collimator in which is disposed a radiation source. An opening is defined by the collimator for exposing a selected portion of the imaging detectors of the tomograph device. Positioned behind the radiation source, relative to the imaging detectors, is the dedicated attenuation detector. In a dual head tomograph device, one transmission source of the present invention is disposed opposite each bank of imaging detectors. The sources and the associated collimators are positioned to the side of each head at a slight angle relative to the respective head. The sources and detectors are fixed relative to the imaging heads. In order to obtain full coverage of the field of view (FOV) in the same manner as for an emission scan, the heads and sources are rotated about the center of the camera. In SPECT mode, the point source is selected to have sufficiently high energy to shine through the patient and the collimators associated with the imaging detector.
    • 传输源用于检测来自辐射源的活动以校正PET模式或SPECT模式中的衰减。 传输源包括专用于在PET模式下收集衰减数据的检测器。 准直辐射源和检测器相对于断层摄影装置定位,使得只有层析成像仪的成像检测器的选定条带被照亮,从而消除与衰减无关的事件。 传输源可以是重合传输源或单个传输源,并且包括准直仪,其中设置有辐射源。 由准直器限定开口以暴露层析成像装置的成像检测器的选定部分。 相对于成像检测器定位在辐射源之后,是专用的衰减检测器。 在双头断层摄影装置中,本发明的一个发射源与每一组成像检测器相对设置。 源和相关联的准直仪相对于相应的头部以相当小的角度定位在每个头部的侧面。 源和检测器相对于成像头是固定的。 为了以与发射扫描相同的方式获得视场(FOV)的全面覆盖,头部和源围绕照相机的中心旋转。 在SPECT模式中,点源被选择为具有足够高的能量以照射通过患者和与成像检测器相关联的准直仪。
    • 9. 发明授权
    • Split window scatter correction
    • 拆分窗口散射校正
    • US5633500A
    • 1997-05-27
    • US561936
    • 1995-11-22
    • Hugh T. MorganGary G. JarkewiczPiotr J. ManiawskiStephen D. Miller
    • Hugh T. MorganGary G. JarkewiczPiotr J. ManiawskiStephen D. Miller
    • G01T1/164G01T1/161
    • G01T1/1647G01T1/1642
    • A method of scatter correction for use with gamma cameras includes the steps of detecting and producing a first count value indicative of gamma radiation falling within a first energy range generally associated with a radionuclide photopeak. Gamma radiation falling within second and third energy ranges is also detected and a corresponding count produced. The second and third ranges are above and below the photopeak, respectively. The location of the second and third energy ranges is determined based on the energy resolution of the gamma camera such that a predetermined percentage of the radiation falling within the second and third ranges results from primary radiation. The second and third energy ranges may be located such that they are non-contiguous with the first energy range. Based on the count of radiation falling within the second and third ranges, the scatter radiation falling within the first energy range can be estimated, and the first count value corrected. The method is suitable for use with radionuclides having multiple closely spaced photopeaks as well as with multiple widely spaced photopeaks.
    • 用于伽马照相机的散射校正方法包括以下步骤:检测并产生指示伽马辐射落在通常与放射性核素光峰相关联的第一能量范围内的第一计数值。 也检测到落在第二和第三能量范围内的伽马辐射,并产生相应的计数。 第二和第三范围分别在光峰之上和之下。 基于γ相机的能量分辨率来确定第二和第三能量范围的位置,使得落入第二和第三范围内的预定百分比的辐射源自初级辐射。 第二和第三能量范围可以被定位成使得它们与第一能量范围不连续。 基于落在第二和第三范围内的辐射计数,可以估计落在第一能量范围内的散射辐射,并且校正第一计数值。 该方法适用于具有多个紧密间隔的光峰的放射性核素以及多个宽间隔的光峰。