Emission-transmission imaging system using single energy and dual energy
transmission and radionuclide emission data
    2.
    发明授权
    Emission-transmission imaging system using single energy and dual energy transmission and radionuclide emission data 失效
    使用单能量和双能量传输和放射性核素发射数据的发射透射成像系统

    公开(公告)号:US5376795A

    公开(公告)日:1994-12-27

    申请号:US958980

    申请日:1992-10-09

    摘要: Radionuclide emission imaging is improved by correcting emission-transmission data for attenuation along calculated path lengths and through calculated basis material. X-ray transmission data are used to develop an attenuation map through an object which is then used in reconstructing an image based on emission data, Radiation detection circuitry is provided which has different operating modes in detecting the x-ray and emission photons passing through the object. An iterative process is used to reconstruct the radionuclide distribution using the radionuclide projection data and the attenuation map based on physical characteristics of the object being imaged. Subsets of the complete radionuclide projection data are used to reconstruct image subsets of the radionuclide distribution. The image subsets can be generated concurrently with the acquisition of the radionuclide projection data or following acquisition of all data.

    摘要翻译: 通过根据计算的路径长度和通过计算的基础材料校正用于衰减的发射数据来改善放射性核素发射成像。 X射线透射数据用于通过物体开发衰减图,该物体然后用于基于发射数据重建图像。提供了辐射检测电路,其在检测通过X射线的x射线和发射光子时具有不同的操作模式 目的。 迭代过程用于使用放射性核素投影数据和基于被成像对象的物理特性的衰减图来重构放射性核素分布。 完整的放射性核素投影数据的子集用于重建放射性核素分布的图像子集。 图像子集可以与获取放射性核素投影数据同时产生,也可以在获取所有数据之后产生。

    Large field of view transmission and small field of view emission scan
within gamma camera system
    3.
    发明授权
    Large field of view transmission and small field of view emission scan within gamma camera system 失效
    伽马相机系统中的大视野传输和小视野发射扫描

    公开(公告)号:US5598003A

    公开(公告)日:1997-01-28

    申请号:US438834

    申请日:1995-05-11

    IPC分类号: G01T1/164 G01T1/161

    摘要: A method and apparatus for collecting transmission information utilizing a large field of view of a detector and for collecting emission data using a small field of view window of the same detector. The system employs the large field of view of a scintillation detector in order to collect transmission data for the entire body being scanned. Such a technique improves the quantitative capability of emission data by acquiring non-truncated attenuation factors. The emission data of a small field of view window is collected so that high resolution image pixels are used for processing the emission data (e.g., of a particular body organ). Since a large field of view is used for collecting the transmission data, the imaging pixels for transmission data are of lower resolution than the emission data. The emission data can be collected using a roving zoom technique during an ECT scan. A computation adjusts the transmission data to account for the known location of the emission zoom window on the crystal and for the different pixel sizes between the full field of view transmission scan of the body and the smaller roving electronic field of view emission scan of the body organ.

    摘要翻译: 一种用于利用检测器的大视野来收集传输信息并且使用相同检测器的小视野窗收集发射数据的方法和装置。 该系统采用闪烁检测器的大视野,以便收集被扫描的整个身体的传输数据。 这种技术通过获取非截断衰减因子来提高发射数据的定量能力。 收集小视场窗口的发射数据,使得高分辨率图像像素用于处理发射数据(例如,特定身体器官)。 由于使用大的视野来收集传输数据,所以用于传输数据的成像像素的分辨率低于发射数据。 在ECT扫描期间,可以使用粗纱放大技术收集排放数据。 计算调整传输数据以考虑在晶体上的发射变焦窗口的已知位置以及身体的全视野透射扫描与身体的较小的粗纱电子视野发射扫描之间的不同像素尺寸 器官。

    Use of body boundary information to perform iterative reconstruction in
medical imaging system
    4.
    发明授权
    Use of body boundary information to perform iterative reconstruction in medical imaging system 失效
    使用身体边界信息在医学成像系统中进行迭代重建

    公开(公告)号:US5739539A

    公开(公告)日:1998-04-14

    申请号:US625533

    申请日:1996-03-27

    IPC分类号: G01T1/164 G01T1/166 G01T1/29

    摘要: A method of performing image reconstruction in a gamma camera system comprises the steps of performing a transmission scan of an object about a number of rotation angles to collect transmission projection data and performing an emission scan of the object about numerous rotation angles to collect emission projection data. The outer boundary of the object is then located based on the transmission projection data. Information identifying the boundary is then either stored in a separate body contour map or embedded in an attenuation map. The information identifying the boundary can be in the form of flags indicating whether individual pixels are inside or outside the boundary of the object. The emission projection data is then reconstructed, using the attenuation map if desired, to generate transverse slice images. By using the body boundary information, portions of the emission projection data representing points outside the boundary of the object are not reconstructed in order to reduce total reconstruction time.

    摘要翻译: 在伽马照相机系统中执行图像重建的方法包括以下步骤:对多个旋转角度进行物体的发射扫描,以收集透射投影数据,并执行关于多个旋转角度的物体的发射扫描以收集发射投影数据 。 然后基于传输投影数据来定位对象的外边界。 然后将识别边界的信息存储在单独的身体轮廓图中或嵌入衰减图中。 识别边界的信息可以是指示个体像素是否在对象的边界内部或外部的标志的形式。 然后如果需要,使用衰减图重建发射投影数据,以产生横切片图像。 通过使用身体边界信息,不重建表示物体边界外的点的发射投影数据的部分,以减少总重构时间。