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    Method and system for correcting butting artifacts in X-ray images
    1.
    发明申请
    Method and system for correcting butting artifacts in X-ray images 有权
    用于校正X射线图像中的伪像的方法和系统

    公开(公告)号：US20090080756A1

    公开(公告)日：2009-03-26

    申请号：US12283357

    申请日：2008-09-11

    申请人： Ti-chiun Chang ,  Yunqiang Chen ,  Tong Fang ,  Sandra Martin ,  Stefan Bohm ,  Peter Durlak

    发明人： Ti-chiun Chang ,  Yunqiang Chen ,  Tong Fang ,  Sandra Martin ,  Stefan Bohm ,  Peter Durlak

    IPC分类号： G06K9/00

    CPC分类号： G06K9/346 ,  G06K2209/05 ,  G06T5/005 ,  G06T5/20 ,  G06T2207/10116 ,  G06T2207/20012 ,  G06T2207/20076 ,  G06T2207/30004

    摘要： A method and system for correcting butting artifacts in x-ray images is disclosed. In order to correct a butting artifact in an x-ray image, a butting artifact region in the x-ray image is normalized. Multiple intensity shift estimators are calculated for each pixel of each line of the butting artifact. Confidence intervals are calculated for each intensity shift estimator. A multiple hypothesis hidden Markov model (MH-HMM) is formulated based on the intensity shift operators and confidence measures subject to a smoothness constraint, and the MH-HMM is solved to determine intensity shift values for each pixel. A corrected image is generated by adjusting the intensity of each pixel of the butting artifact based on the intensity shift value for that pixel.

    摘要翻译： 公开了一种用于校正X射线图像中的伪像的方法和系统。 为了校正X射线图像中的对接伪影，对x射线图像中的对接伪影区域进行归一化。 针对对接工件的每一行的每个像素计算多个强度偏移估计量。 为每个强度偏移估计器计算置信区间。 基于强度偏移算子和基于平滑度约束的置信度度度，制定了多重假设隐马尔可夫模型（MH-HMM），并求解了MH-HMM，以确定每个像素的强度偏移值。 通过基于该像素的强度偏移值调整对接伪影的每个像素的强度来生成校正图像。

    METHOD FOR OPERATING AN X-RAY DIAGNOSTIC APPARATUS FOR DETERMINING QUALITY VALUES
    6.
    发明申请
    METHOD FOR OPERATING AN X-RAY DIAGNOSTIC APPARATUS FOR DETERMINING QUALITY VALUES 有权
    用于确定质量值的X射线诊断装置的方法

    公开(公告)号：US20090169088A1

    公开(公告)日：2009-07-02

    申请号：US12401295

    申请日：2009-03-10

    申请人： Stefan Bohm ,  Peter Durlak ,  Volker Heer ,  Martin Kolarjk

    发明人： Stefan Bohm ,  Peter Durlak ,  Volker Heer ,  Martin Kolarjk

    IPC分类号： G06K9/00

    CPC分类号： G06T7/0002 ,  A61B6/504 ,  A61B6/583 ,  H04N5/325 ,  Y10S128/922

    摘要： A method for checking an x-ray diagnostic apparatus is provided. Fluoroscopic series of x-ray images of a technical phantom are digitally acquired and stored. Difference between a dynamic image and a background image is calculated. A measuring field is predicted. Priori information about the shape of a clinically relevant object is determined. Hough transformation on a gray value image corresponding to the difference is applied. Contrast of the object from the Hough-transformed gray value image is determined. A square of the determined contrast is calculated. A noise variance is calculated by determining a sum of a noise variance of a homogenous image region and a variance of the background image. A contrast-to-noise ratio of the determined contrast and the calculated noise variance is determined. A square of the contrast-to-noise ratio is dynamically averaged. A Clinical Relevant Fluoroscopy Performance index for the x-ray diagnostic apparatus is determined.

    摘要翻译： 提供了一种用于检查x射线诊断装置的方法。 数字获取和存储技术幻像的荧光系列X射线图像。 计算动态图像和背景图像之间的差异。 预测测量场。 确定关于临床相关对象的形状的优先信息。 应用与差异对应的灰度值图像上的霍夫变换。 确定来自霍夫变换灰度值图像的对象的对比度。 计算确定的对比度的平方。 通过确定均匀图像区域的噪声方差和背景图像的方差的和来计算噪声方差。 确定所确定的对比度和所计算的噪声方差的对比噪声比。 动态平均对比噪声比的平方。 确定X线诊断仪的临床相关荧光检查性能指标。

    METHOD FOR SETTING AT LEAST ONE CONTROL VARIABLE OF A FILTER FOR NOISE REDUCTION IN MEDICAL IMAGES
    7.
    发明申请
    METHOD FOR SETTING AT LEAST ONE CONTROL VARIABLE OF A FILTER FOR NOISE REDUCTION IN MEDICAL IMAGES 有权
    用于设置医疗图像中用于减少噪声的滤波器的至少一个控制变量的方法

    公开(公告)号：US20090285461A1

    公开(公告)日：2009-11-19

    申请号：US12437762

    申请日：2009-05-08

    申请人： Stefan Bohm ,  Sandra Martin ,  Ralph Wossner

    发明人： Stefan Bohm ,  Sandra Martin ,  Ralph Wossner

    IPC分类号： G06K9/00

    CPC分类号： G06K9/40 ,  G06K2209/05 ,  G06T5/002 ,  G06T5/20 ,  G06T2207/10116 ,  G06T2207/20008

    摘要： A method for setting a control variable of a filter for noise reduction in medical images is provided. Image data of the medical images is classified into at least one noise region and at least one structure region. A variance measurement is performed either for all the image pixels or a subset of them to determine the edge thicknesses. A histogram is generated from the edge thicknesses. The maximum of the histogram is determined and a Gaussian curve is fitted to the histogram. A threshold value for noise and structure is determined as a function of the standard deviation of the Gaussian curve. The noise and structure are measured in the regions. The standard noise and structure deviations are determined and compared. The control variable is setup as a function of the comparison of noise and structure. The invention can be used for reduction of temporal noise in bandpass images.

    摘要翻译： 提供了一种用于设置用于医疗图像中的降噪的滤波器的控制变量的方法。 医疗图像的图像数据被分类为至少一个噪声区域和至少一个结构区域。 对于所有图像像素或其子集来执行方差测量以确定边缘厚度。 从边缘厚度生成直方图。 确定直方图的最大值，并将高斯曲线拟合到直方图。 噪声和结构的阈值被确定为高斯曲线的标准偏差的函数。 在这些地区测量噪声和结构。 确定和比较标准噪声和结构偏差。 控制变量作为噪声和结构比较的函数进行设置。 本发明可用于减少带通图像中的时间噪声。

    Method of displaying images
    8.
    发明申请
    Method of displaying images 有权
    显示图像的方法

    公开(公告)号：US20060098006A1

    公开(公告)日：2006-05-11

    申请号：US11230803

    申请日：2005-09-20

    申请人： Stefan Bohm ,  Sandra Martin

    发明人： Stefan Bohm ,  Sandra Martin

    IPC分类号： G06T1/00 ,  G06F17/00

    CPC分类号： H04N5/325

    摘要： The present invention relates to a method for image reproduction, in particular for single or serial medical exposures, whereby one or more main images are reproduced on a display device. The method is characterized in that additional or interim images are generated using image interpolation prior to image reproduction from the one or more main images and in that additional image noise which varies from image to image is applied to the one or more main images and the additional or interim images, said image noise being generated by a noise generator, and image reproduction taking place by displaying in chronological order the one or more main images and additional or interim images to which the additional image noise has been applied. The method in particular improves the visual image impression in the case of fluoroscopic X-ray image exposures, without having to in-crease the applied X-ray dose.

    摘要翻译： 本发明涉及一种用于图像再现的方法，特别是用于单次或连续医疗照射，其中在显示装置上再现一个或多个主图像。 该方法的特征在于，使用来自一个或多个主图像的图像再现之前的图像插值来生成附加或中间图像，并且从图像到图像变化的附加图像噪声被应用于一个或多个主图像和附加 或临时图像，所述图像噪声由噪声发生器产生，并且通过按照时间顺序显示已应用附加图像噪声的一个或多个主图像和附加或临时图像来进行图像再现。 该方法特别地改善了在透视X射线图像曝光的情况下的视觉图像印象，而不必减少施加的X射线剂量。

    Method and device for noise suppression in medical images
    9.
    发明申请
    Method and device for noise suppression in medical images 有权
    医学图像中噪声抑制的方法和装置

    公开(公告)号：US20090148015A1

    公开(公告)日：2009-06-11

    申请号：US12313566

    申请日：2008-11-21

    申请人： Stefan Bohm ,  Sandra Martin

    发明人： Stefan Bohm ,  Sandra Martin

    IPC分类号： G06K9/00

    CPC分类号： A61B6/504 ,  A61B6/12 ,  G06T5/002 ,  G06T7/13 ,  G06T2207/10116 ,  G06T2207/20012 ,  G06T2207/30004

    摘要： The invention relates to a method for noise suppression in medical images comprising steps of measuring the gradient field strength of an image pixel and selecting a suitable filter mask for noise suppression as a function of the gradient field strength, with the value of the gradient field strength being compared with a predetermined threshold value. The method is repeated when an additional image pixel is selected. A decision is made per read-in image pixel as to which type of filter mask is used for filtering. A selection can be made between filter masks of different sizes or isotropic or anisotropic or directional filter masks. The decision is based on the measured gradient field strength of the respective pixel. The use of different filter masks allows the signal-to-noise ratio to be improved, without distorting structures like edges for instance and without generating artificial structures in homogenous noise regions.

    摘要翻译： 本发明涉及一种医学图像中的噪声抑制方法，包括以下步骤：测量图像像素的梯度场强，并根据梯度场强度选择合适的噪声抑制滤波器掩模，梯度场强 与预定阈值进行比较。 当选择附加图像像素时重复该方法。 每个读入图像像素决定使用哪种类型的滤波器掩码进行滤波。 可以选择不同尺寸的滤光片或各向同性或各向异性或方向滤光片。 该决定基于相应像素的测量的梯度场强度。 使用不同的滤波器掩模允许提高信噪比，而不会像边缘这样的结构变形，而不会在同质噪声区域中产生人造结构。