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1. 发明授权

US06694047B1 Method and apparatus for automated image quality evaluation of X-ray systems using any of multiple phantoms 有权
标题翻译：用于使用多个幻影中的任一个的X射线系统的自动图像质量评估的方法和装置
公开(公告)号：US06694047B1
公开(公告)日：2004-02-17
申请号：US09354389
申请日：1999-07-15
申请人： Farshid Farrokhnia , Kenneth Scott Kump , Richard Aufrichtig , Alexander Y. Tokman
发明人： Farshid Farrokhnia , Kenneth Scott Kump , Richard Aufrichtig , Alexander Y. Tokman
IPC分类号： G06K900
CPC分类号： A61B6/583
摘要： A system for automated x-ray system parameter evaluation is provided. A physical model or template is created and stored in the system, one for each desired phantom. The automated system imports a grayscale x-ray image and then processes the image to determine image components. First, a histogram of the image is created, then a threshold in the histogram is determined and the imported image is binarized with respect to the threshold. Next, connected component analysis is used to determine image components. If the components do not match, then the image is rejected. The system next locates landmarks in the imported image corresponding to expected physical structures. The landmarks include a perimeter ring, vertical and horizontal line segments, and fiducials. The system uses the landmarks to predict Regions of Interest (ROIs) where measurement of the x-ray system parameters takes place. Finally, the x-ray system parameters are measured in the identified ROIs.
摘要翻译：提供了一种自动X射线系统参数评估系统。物理模型或模板被创建并存储在系统中，每个想要的幻影一个。自动化系统导入灰度x射线图像，然后处理图像以确定图像分量。首先，创建图像的直方图，然后确定直方图中的阈值，并将导入的图像相对于阈值二值化。接下来，使用连通分量分析来确定图像分量。如果组件不匹配，则图像被拒绝。系统接下来根据预期的物理结构定位导入的图像中的地标。地标包括周边环，垂直和水平线段以及基准点。该系统使用地标来预测发生X射线系统参数测量的感兴趣区域（ROI）。最后，在所识别的ROI中测量x射线系统参数。

2. 发明授权

US5841835A Apparatus and method for automatic monitoring and assessment of image quality in x-ray systems 失效
标题翻译：用于自动监测和评估x射线系统图像质量的装置和方法
公开(公告)号：US5841835A
公开(公告)日：1998-11-24
申请号：US823037
申请日：1997-03-31
申请人： Richard Aufrichtig , Alexander Y. Tokman
发明人： Richard Aufrichtig , Alexander Y. Tokman
IPC分类号： A61B6/00 , G06T1/00 , H05G1/26 , H05G1/60 , G01D18/00
CPC分类号： A61B6/583 , H05G1/26 , H05G1/60
摘要： An image quality test phantom tool is provided for use in the calibration and standardization of digital x-ray fluoroscopy and radiography systems. A composite phantom has a base for providing mechanical stability, a mesh with a central cut-out overlaid on the base, inserts positioned in the cut-out, and a carrier for housing the composite phantom. A digital image of the phantom is processed to compute x-ray system image quality measurements.
摘要翻译：提供图像质量测试幻影工具，用于数字X射线透视和射线照相系统的校准和标准化。复合体模具有用于提供机械稳定性的基座，具有覆盖在基座上的中心切口的网，位于切口中的插入件和用于容纳复合体模的托架。处理虚像的数字图像以计算x射线系统图像质量测量。

3. 发明授权

US06940539B1 Variable cable length compensator for video imaging systems 失效
标题翻译：视频成像系统可变电缆长度补偿器
公开(公告)号：US06940539B1
公开(公告)日：2005-09-06
申请号：US09302867
申请日：1999-04-30
申请人： Alexander Y. Tokman , Manfred D. Boehm
发明人： Alexander Y. Tokman , Manfred D. Boehm
IPC分类号： H04N7/18 , H04B3/04 , H04N5/232 , H04N5/32 , H04N5/335 , H03F3/191
CPC分类号： H04N5/32 , H04N5/23203
摘要： Described herein is a cable length compensator for inclusion in video imaging systems such as X-ray video imaging systems. When such systems are installed at sites of use, cables must generally be installed in the signal path, and the lengths of these cables—which can affect signal resolution—generally cannot be predicted prior to the time of installation. The cable compensator may be situated in the signal path along with the cable to compensate the signal for the effects of the cable so that the desired gain is provided across the desired range of signal frequencies. The compensator includes a low frequency compensation path and a high frequency compensation path, wherein the low frequency compensation path provides a simple gain adjustment to low frequency signals and the high frequency path provides gain adjustment dependent on both signal frequency and cable length. The high frequency gain adjustment is preferably provided by an array of high-pass filters which provide a substantially flat response across the range of input frequencies, and at least one variable resistance which may be adjusted for the desired high-frequency gain.
摘要翻译：这里描述的是用于包括在诸如X射线视频成像系统的视频成像系统中的电缆长度补偿器。当这种系统安装在使用场所时，电缆通常必须安装在信号路径中，并且这些电缆的长度（可能会影响信号分辨率）一般不能在安装时间之前进行预测。电缆补偿器可以与电缆一起位于信号路径中，以补偿信号对于电缆的影响，从而在期望的信号频率范围内提供期望的增益。补偿器包括低频补偿路径和高频补偿路径，其中低频补偿路径为低频信号提供简单的增益调整，高频路径根据信号频率和电缆长度提供增益调整。高频增益调整优选地由高通滤波器阵列提供，该阵列的高通滤波器在输入频率范围内提供基本上平坦的响应，以及可以针对期望的高频增益调整至少一个可变电阻。

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