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    • 3. 发明申请
    • Method and system for calibrating deformed instruments
    • 校准变形仪器的方法和系统
    • US20050222793A1
    • 2005-10-06
    • US10817652
    • 2004-04-02
    • Charles LloydMichel GrimaudAlex LiLewis LevineJon Lea
    • Charles LloydMichel GrimaudAlex LiLewis LevineJon Lea
    • A61B5/05A61B19/00G01C19/00
    • A61B90/36A61B34/20A61B2034/102A61B2034/2051A61B2034/2055A61B2034/207A61B2090/0813
    • Certain embodiments of the present invention provide a system and method for calibrating an instrument for an image-guided operation. The method includes placing a plurality of fiducials on an instrument, obtaining a plurality of measurements for the instrument using the plurality of fiducials, determining a representation of the instrument in a reference coordinate system using the plurality of measurements for use in tracking the instrument, and performing an image-guided operation using an image data set and representation of the instrument. The representation may be a closed form registration for the instrument. The measurements for the instrument may be obtained using a plurality of fiducials and a sensor. The fiducials may be indentations and/or grooves in the instrument. In an embodiment, the representation of the instrument is dynamically updated during an image-guided operation. In an embodiment, the representation of the instrument is compared to a computer-generated model of the instrument.
    • 本发明的某些实施例提供了一种校准用于图像引导操作的仪器的系统和方法。 该方法包括将多个基准放置在仪器上,使用多个基准获得用于仪器的多个测量结果,使用多个用于跟踪仪器的测量值在参考坐标系中确定仪器的表示,以及 使用图像数据集和仪器的表示执行图像引导操作。 该表示可能是该仪器的封闭表格注册。 仪器的测量可以使用多个基准和传感器来获得。 基准可能是仪器中的凹陷和/或凹槽。 在一个实施例中,在图像引导操作期间动态地更新仪器的表示。 在一个实施例中,将仪器的表示与计算机生成的仪器模型进行比较。
    • 4. 发明授权
    • Procedure for automatic position-finding of points of interest during a
mammography examination using stereotactic technique
    • 使用立体定位技术在乳房X线照相检查期间自动定位感兴趣的程序
    • US5544219A
    • 1996-08-06
    • US332743
    • 1994-11-01
    • Serge MullerMichel GrimaudRobert Heidsieck
    • Serge MullerMichel GrimaudRobert Heidsieck
    • A61B19/00G06T5/20G06T5/30G06T7/00H04N13/00A61B6/12
    • G06T5/30A61B90/10G06T7/0042G06T2207/10012G06T2207/30068H04N2013/0074
    • A process is disclosed which involves automatic position-finding for a point of interest of an object that exhibits high contrast as compared with surrounding tissues, the process being carried out by means of a stereotactic photographic device that includes a digital image acquisition system. The process includes a number of steps for each image belonging to the pair of stereotactic images. An initial analysis of a histogram of the image pixels are made, and a subsequent determination is made of a threshold corresponding to the difference between the high contrast objects and the surrounding tissues. A subsequent determination is made of the threshold of the image, in order to obtain a binary image incorporating two gray levels. This is followed by the filtering of the threshold determined image in the preceding step, based on morphological criteria of the object in which the point of interest is located. This operation is designed to obtain a segmented projection of the object of interest. This is followed by the localization of the point of interest in the image reference mark. Utilization of the process is for stereotactic examinations performed during mammography.
    • 公开了一种涉及与周围组织相比显示高对比度的物体的感兴趣点的自动位置查找的过程,该过程通过包括数字图像采集系统的立体定向照相装置进行。 该过程包括属于一对立体定向图像的每个图像的多个步骤。 进行图像像素的直方图的初始分析,并且随后确定对应于高对比度对象与周围组织之间的差的阈值。 随后确定图像的阈值,以便获得并入两个灰度级的二进制图像。 接下来是基于目标位置的对象的形态标准对前一步骤中的阈值确定图像的过滤。 该操作被设计为获得感兴趣对象的分段投影。 接下来是图像参考标记中的兴趣点的本地化。 该过程的利用是在乳房X线照相术期间进行的立体定向检查。