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    METHOD FOR SETTING AT LEAST ONE CONTROL VARIABLE OF A FILTER FOR NOISE REDUCTION IN MEDICAL IMAGES
    1.
    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 and system for correcting butting artifacts in X-ray images
    2.
    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 of displaying images
    3.
    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
    4.
    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。

    Method for determining a position for at least one semi-transparent diaphragm and associated facility
    9.
    发明申请
    Method for determining a position for at least one semi-transparent diaphragm and associated facility 有权
    用于确定至少一个半透明隔膜和相关设施的位置的方法

    公开(公告)号：US20080175462A1

    公开(公告)日：2008-07-24

    申请号：US12008942

    申请日：2008-01-15

    申请人： Stefan Bohm ,  Klaus Finkler

    发明人： Stefan Bohm ,  Klaus Finkler

    IPC分类号： A61B6/00

    CPC分类号： A61B6/06 ,  A61B6/4441 ,  A61B6/542 ,  G06T7/12 ,  G06T7/73 ,  G06T2207/10121 ,  G06T2207/20036 ,  G06T2207/30004 ,  H04N5/32

    摘要： The invention relates to a method for determining a position for at least one semi-transparent diaphragm during a radiological observation of a body region of a patient by means of a radiological facility, in particular during an observation accompanying an interventional measure, comprising: producing at least one radiological image recording and/or a sequence of image recordings by means of the radiological facility; analyzing the image recording and/or the sequence of image recordings by means of automatic image processing by a computing facility for identifying less absorbent image regions which may be present; and automatically determining the position for the at least one semi-transparent diaphragm as a function of the image analysis result by means of the computing facility.

    摘要翻译： 本发明涉及一种用于在通过放射学设备放射学观察患者身体区域期间确定至少一个半透明隔膜的位置的方法，特别是在伴随介入措施的观察期间，包括：在 通过放射设备至少一个放射图像记录和/或图像记录序列; 通过用于识别可能存在的较少吸收图像区域的计算设备的自动图像处理来分析图像记录和/或图像记录序列; 并且通过所述计算设备自动地确定所述至少一个半透明膜片的位置作为所述图像分析结果的函数。