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    MTF measuring method and system
    13.
    发明申请
    MTF measuring method and system 有权
    MTF测量方法和系统

    公开(公告)号：US20050100244A1

    公开(公告)日：2005-05-12

    申请号：US10981916

    申请日：2004-11-04

    申请人： Xueli Wang ,  Xiongwei Yan ,  Wei Ding ,  Makoto Gohno

    发明人： Xueli Wang ,  Xiongwei Yan ,  Wei Ding ,  Makoto Gohno

    IPC分类号： A61B6/03 ,  G01M11/00 ,  G01M11/02 ,  G06F17/00 ,  G06K9/00 ,  G06K9/36 ,  G06T1/00 ,  G06T7/00 ,  G06T7/60

    CPC分类号： G01M11/0292 ,  G06T7/66 ,  G06T7/70

    摘要： A method of measuring a modulation transfer function (MTF) includes detecting the center of a line spread function (LSF) image in order to calculate an MTF. For this purpose, an enlarged image of a portion of an image containing the LSF image is created, and binary-coded based on a threshold. A morphological operation is performed on the binary-coded image. Coordinates representing points that define the contour of the resultant image are sampled, and used to work out coordinates representing the center of a circle through Hough transform. The coordinates representing the center are transformed into coordinates representing a point in an original image.

    摘要翻译： 测量调制传递函数（MTF）的方法包括检测线扩展函数（LSF）图像的中心，以便计算MTF。 为此，创建包含LSF图像的图像的一部分的放大图像，并且基于阈值进行二进制编码。 对二进制编码图像进行形态学操作。 对表示定义所得图像轮廓的点的坐标进行采样，并用于通过霍夫变换求出表示圆心的坐标。 表示中心的坐标被转换为表示原始图像中的点的坐标。

    Method for controlling X-ray exposure in X-ray CT system
    14.
    发明授权
    Method for controlling X-ray exposure in X-ray CT system 失效
    X射线CT系统中X射线曝光控制方法

    公开(公告)号：US07995703B2

    公开(公告)日：2011-08-09

    申请号：US12342434

    申请日：2008-12-23

    申请人： Xiongwei Yan

    发明人： Xiongwei Yan

    IPC分类号： H05G1/10 ,  H05G1/34 ,  G01N23/083

    CPC分类号： A61B6/588 ,  A61B6/032 ,  A61B6/488 ,  A61B6/542 ,  A61B6/583

    摘要： A method for controlling automatic X-ray exposure in an X-ray CT system includes establishing a correspondence table or function relationship between a ratio factor and an offset of a geometrical center of a scanned section, wherein the ratio factor represents a ratio of the projection area value when the geometrical center of the scanned section of a subject deviates from a rotation center to the standard projection area value when the geometrical center of the scanned section of the subject locates at the rotation center, scout scanning the subject, and calculating a “measured projection area value” and Projection Measure based on the scout scan data, calculating the offset of the geometrical center of the scanned section from the rotation center, substituting the offset into the correspondence table or function relationship to obtain a corresponding ratio factor, calculating the standard projection area value based on the ratio factor and the measured projection area value, and automatically determining by an automatic exposure function a tube current value required for exposure based on the calculated standard projection area value, the Projection Measure.

    摘要翻译： 用于控制X射线CT系统中的自动X射线曝光的方法包括建立扫描部分的几何中心的比率因子和偏移之间的对应表或函数关系，其中，比率因子表示投影的比率 当被摄体的扫描部分的几何中心位于旋转中心时，当被摄体的扫描部分的几何中心偏离旋转中心至标准投影面积值时，测量区域值，并且计算“ 测量投影面积值“和基于侦察扫描数据的投影测量，计算扫描部分与旋转中心的几何中心的偏移量，将偏移量替换为对应表或函数关系，以获得相应的比例因子，计算 基于比率因子和测量投影面积值的标准投影面积值，以及 根据计算的标准投影面积值，投影测量，通过自动曝光功能自动确定曝光所需的管电流值。

    MTF measuring method and system
    15.
    发明授权
    MTF measuring method and system 有权
    MTF测量方法和系统

    公开(公告)号：US07330609B2

    公开(公告)日：2008-02-12

    申请号：US10981916

    申请日：2004-11-04

    申请人： Xueli Wang ,  Xiongwei Yan ,  Wei Ding ,  Makoto Gohno

    发明人： Xueli Wang ,  Xiongwei Yan ,  Wei Ding ,  Makoto Gohno

    IPC分类号： G06K9/56 ,  H01L27/146

    CPC分类号： G01M11/0292 ,  G06T7/66 ,  G06T7/70

    摘要： A method of measuring a modulation transfer function (MTF) includes detecting the center of a line spread function (LSF) image in order to calculate an MTF. For this purpose, an enlarged image of a portion of an image containing the LSF image is created, and binary-coded based on a threshold. A morphological operation is performed on the binary-coded image. Coordinates representing points that define the contour of the resultant image are sampled, and used to work out coordinates representing the center of a circle through Hough transform. The coordinates representing the center are transformed into coordinates representing a point in an original image.

    摘要翻译： 测量调制传递函数（MTF）的方法包括检测线扩展函数（LSF）图像的中心，以便计算MTF。 为此，创建包含LSF图像的图像的一部分的放大图像，并且基于阈值进行二进制编码。 对二进制编码图像进行形态学操作。 对表示定义所得图像轮廓的点的坐标进行采样，并用于通过霍夫变换求出表示圆心的坐标。 表示中心的坐标被转换为表示原始图像中的点的坐标。

    X-RAY CT APPARATUS
    17.
    发明申请
    X-RAY CT APPARATUS 审中-公开
    X射线CT装置

    公开(公告)号：US20100166138A1

    公开(公告)日：2010-07-01

    申请号：US12645155

    申请日：2009-12-22

    申请人： Xiongwei Yan

    发明人： Xiongwei Yan

    IPC分类号： H05G1/60

    CPC分类号： A61B6/032 ,  A61B6/0457 ,  A61B6/4028

    摘要： An X-ray CT apparatus includes an X-ray irradiator which irradiates fan-beam X-rays; a multi-channel X-ray detector disposed to face the X-ray irradiator; a transmitted X-ray data collection device which scans a subject while rotating the X-ray irradiator and the X-ray detector to collect transmitted X-ray data of two or more views; a scan control device which controls the scan; and an image reconstruction device which reconstructs an image. The X-ray irradiator irradiates fan-beam X-rays which are deflected to one side of the center of rotation, the X-ray detector has the number of channels to cope with a spread of the fan-beam X-rays, and the scan control device allows the X-ray irradiator and the X-ray detector to conduct a scan of at least one rotation.

    摘要翻译： X射线CT装置包括照射扇形束X射线的X射线照射器; 设置为面对X射线照射器的多通道X射线检测器; 透射X射线数据采集装置，其在旋转X射线照射器和X射线检测器以收集两个或更多个视图的透射X射线数据的同时扫描对象; 控制扫描的扫描控制装置; 以及重构图像的图像重建装置。 X射线照射器照射偏转到旋转中心一侧的扇形束X射线，X射线检测器具有能够应对扇形束X射线扩散的通道数， 扫描控制装置允许X射线照射器和X射线检测器进行至少一个旋转的扫描。