公开(公告)号：US20120305792A1

公开(公告)日：2012-12-06

申请号：US13480157

申请日：2012-05-24

申请人： Takeshi KUWABARA ,  Keita WATANABE ,  Jun ENOMOTO ,  Yasufumi ODA ,  Takeshi KOISHI

发明人： Takeshi KUWABARA ,  Keita WATANABE ,  Jun ENOMOTO ,  Yasufumi ODA ,  Takeshi KOISHI

IPC分类号： G01T1/17

CPC分类号： G01T1/243 ,  G01T1/17 ,  G01T1/2018 ,  H04N5/32

摘要： An x-ray image detector monitors the intensity of incident x-rays to detect an end of radiation from an x-ray source when the x-ray intensity decreases to a threshold level or less. The x-ray intensity gets down to zero with a variable time lag from the start of decreasing, called radiation wave tail. Depending on the gradient of declivity in time curve of the decreasing x-ray intensity, calculated at the time when the end of radiation is detected, the x-ray image detector decides a delay time from the end-of-radiation detection time to a reading start time to start reading signal charges from the image detector. Thus, the reading start time may be adjusted to the point when the x-ray intensity gets down to zero, which will improve S/N ratio and prevent shading artifacts.

摘要翻译： 当X射线强度降低到阈值水平或更低时，X射线图像检测器监测入射的X射线的强度以检测来自X射线源的辐射的结束。 X射线强度从减小开始的可变时间滞后变为零，称为辐射波尾。 根据在检测到辐射结束时计算出的x射线强度减小的时间曲线下的倾斜度的梯度，X射线图像检测器决定从放射检测结束时间到延迟时间的延迟时间 读取开始时间开始从图像检测器读取信号电荷。 因此，可以将读取开始时间调整为当x射线强度降至零时的点，这将提高S / N比并防止遮蔽伪像。

公开(公告)号：US20120305791A1

公开(公告)日：2012-12-06

申请号：US13480136

申请日：2012-05-24

申请人： Keita WATANABE ,  Takeshi KUWABARA ,  Yasufumi ODA ,  Jun ENOMOTO ,  Takeshi KOISHI

发明人： Keita WATANABE ,  Takeshi KUWABARA ,  Yasufumi ODA ,  Jun ENOMOTO ,  Takeshi KOISHI

IPC分类号： G01T1/16

CPC分类号： G01T1/247 ,  G01T1/208 ,  G01T1/24 ,  H04N5/32

摘要： A flat panel detector has an imaging area, in which pixels are arrayed in a matrix and signal lines for reading out electric signals from the pixels are provided, to detect an image of a subject from x-rays which are incident on the imaging area after penetrating the subject. Detective elements are arranged in the imaging area, to output electric signals corresponding to incident x-rays. Based on previously stored sensitivity data on the detective elements, high-sensitivity elements are selected from among the detective elements. The start of radiation and the end of radiation of x-rays toward the imaging area are detected by monitoring the electric signals from the selected high-sensitivity elements, to control operation of the imaging device on the basis of the detected start and end of radiation.

摘要翻译： 平板检测器具有成像区域，其中像素被排列成矩阵，并且提供用于从像素读出电信号的信号线，以便在来自入射到成像区域的X射线之后的X射线上检测被摄体的图像 穿透主题。 检测元件布置在成像区域中，以输出对应于入射的X射线的电信号。 基于先前存储的检测元件的灵敏度数据，从检测元件中选择高灵敏度元素。 通过监测来自所选择的高灵敏度元件的电信号来检测X射线朝向成像区域的辐射开始和X射线的辐射结束，以根据检测到的辐射开始和结束来控制成像装置的操作 。

公开(公告)号：US20120051498A1

公开(公告)日：2012-03-01

申请号：US13216157

申请日：2011-08-23

申请人： Takeshi KOISHI

发明人： Takeshi KOISHI

IPC分类号： A61B6/03

CPC分类号： A61B6/025 ,  A61B6/06 ,  A61B6/4233 ,  A61B6/5205 ,  G06T11/006 ,  G06T2211/436 ,  G21K1/04 ,  G21K1/046

摘要： An X-ray imaging system is for irradiating a subject with X ray from an X-ray source at a plurality of different angles to acquire X-ray images, and reconstructing an X-ray tomographic image from the X-ray images. The system comprising a region setting unit for setting a region of interest on a pre-shot image or a previously acquired X-ray tomographic image, an imaging control unit for continuously varying an aperture formed by collimator blades according to a position of the X-ray source to image the region of interest and acquiring projection data of the X-ray images in accordance with the position of the X-ray source, and an image reconstructing unit for reconstructing the X-ray tomographic image from the projection data of the X-ray images of the region of interest. The aperture formed by the collimator blades are varied so that all the X-ray images formed on the X-ray detector is rectangular regardless of the position of the X-ray source.

摘要翻译： X射线成像系统用于从X射线源以多个不同的角度对X射线照射对象以获取X射线图像，并且从X射线图像重建X射线断层图像。 该系统包括用于设置预拍摄图像或先前获取的X射线断层图像上的感兴趣区域的区域设置单元，用于根据X射线X射线照相机的位置连续改变由准直器叶片形成的孔的成像控制单元， 以及根据X射线源的位置获取X射线图像的投影数据;以及图像重建单元，用于根据X射线源的投影数据重建X射线断层图像 描绘感兴趣区域的图像。 由准直器叶片形成的孔径是变化的，使得形成在X射线检测器上的所有X射线图像都是矩形的，而与X射线源的位置无关。

公开(公告)号：US20130051704A1

公开(公告)日：2013-02-28

申请号：US13563163

申请日：2012-07-31

申请人： Takeshi KOISHI

发明人： Takeshi KOISHI

IPC分类号： G06K9/36

CPC分类号： G06K9/2027 ,  G06K9/685 ,  G06K2209/27

摘要： A console of an X-ray imaging system functions as a query receiver and a retrieval section to support decision on an exposure condition. The query receiver receives a retrieval query such as an exposed body portion and an exposure direction. The retrieval section refers to an exposure date of image files having the same patient ID number, and calculates an exposure interval between a pair of prior and subsequent image files the exposure dates of which are the nearest to each other. The exposure interval is compared with a threshold value. If the exposure interval is less than the threshold value, neither image file is assigned as a model image file. If the exposure interval is the threshold value or more, the subsequent image file is assigned as the model image file. The retrieval section retrieves the image file matching the retrieval query out of the model image files.

摘要翻译： X射线成像系统的控制台用作查询接收器和检索部分，以支持对曝光条件的决定。 查询接收器接收诸如暴露的身体部分和曝光方向的检索查询。 检索部分是指具有相同患者ID号的图像文件的曝光日期，并且计算曝光日期彼此最近的一对先前和后续图像文件之间的曝光间隔。 将曝光间隔与阈值进行比较。 如果曝光间隔小于阈值，则图像文件都不会被分配为模型图像文件。 如果曝光间隔是阈值以上，则将后续图像文件分配为模型图像文件。 检索部分从模型图像文件中检索匹配检索查询的图像文件。