公开(公告)号：US20030021375A1

公开(公告)日：2003-01-30

申请号：US10210323

申请日：2002-08-01

申请人： CTI PET Systems, Inc.

发明人： William F. Jones ,  Charles Watson

IPC分类号： G01N023/06

CPC分类号： G01T1/1648

摘要： A coincidence transmission source serves to detect coincident activity from a radiation source. The coincidence transmission source includes a detector dedicated to collecting attenuation data. 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 coincidence transmission source 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. The attenuation detector and collimator are designed to illuminate only a strip of the imaging detector, thereby eliminating events not of interest in the attenuation measurement. An arrangement of fiber optics are interconnected between a plurality of dedicated gamma radiation detectors and a lesser number of photomultiplier tubes. The arrangement of fiber optics is designed such that the address of a particular gamma radiation detector is readily discernable while minimizing the number of PMT's required to process data accumulated by the gamma radiation detectors. In one embodiment, the attenuation point sources are disposed in a two-dimensional array to effectively minimize gamma crosstalk.

摘要翻译： 符合传输源用于检测来自辐射源的重合活动。 符合传输源包括专用于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。 重合传输源包括其中设置有辐射源的准直仪。 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。 衰减检测器和准直器被设计为仅照射成像检测器的条带，从而消除衰减测量中不感兴趣的事件。 光纤的布置在多个专用γ辐射检测器和较少数量的光电倍增管之间互连。 光纤的布置被设计成使得特定伽马辐射检测器的地址容易辨别，同时最小化处理由伽马辐射检测器累积的数据所需的PMT的数量。 在一个实施例中，将衰减点源设置为二维阵列以有效地最小化伽马串扰。

公开(公告)号：US20020163994A1

公开(公告)日：2002-11-07

申请号：US10179060

申请日：2002-06-25

申请人： CTI PET Systems, Inc.

发明人： William F. Jones

IPC分类号： G21K001/12

CPC分类号： G01T1/2985 ,  A61B5/1114 ,  A61B5/1127 ,  A61B5/415 ,  A61B5/418 ,  A61B6/037

摘要： A device and method for on-line correction of patient motion in three-dimensional positron emission tomography. The devices encompass an on-line hardware pipelining architecture to support 3D translation, normalization, and weighted histogramming as required. Five stages of processing for the PET event stream are utilized in the present invention. Each stage feeds the next with progressively modified event packets proceeding at a processing speed of at least 10M packets/sec. Stage 1 calculates an event correction factor (ECF) for each incoming detector-pair event packet. This ECF is incorporated into the event packet for use later in Stage 5. Stage 2 converts the detector-index-pair content of each packet into (x,y,z) pair content. Specifically, the representation of each detector element is converted from a discrete crystal index into a 3-D coordinate index. Stage 3 transforms the (x,y,z) pair into an (xnull,ynull,znull) pair. Stage 4 converts the (xnull,ynull,znull) pair into a bin address. Output from Stage 5 is a normalized projection data set available at the end of each acquisition frame. Stage 5 performs on-line weighted histogramming.

摘要翻译： 用于在三维正电子发射断层扫描中在线校正患者运动的装置和方法。 这些设备包括在线硬件流水线架构，以支持3D转换，归一化和加权直方图。 在本发明中利用了PET事件流的五个处理阶段。 每个阶段以至少10M分组/秒的处理速度进行下一步，逐渐修改的事件分组进行。 阶段1计算每个输入检测器对事件包的事件校正因子（ECF）。 该ECF被合并到事件分组中以在阶段5中稍后使用。阶段2将每个分组的检测器 - 索引对内容转换为（x，y，z）对内容。 具体地，每个检测器元件的表示从离散晶体索引转换成3-D坐标指数。 阶段3将（x，y，z）对变换为（x'，y'，z'）对。 阶段4将（x'，y'，z'）对转换为bin地址。 来自阶段5的输出是在每个采集帧结束时可用的归一化投影数据集。 阶段5执行在线加权直方图。