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1. 发明公开

EP4375937A1 APPARATUS FOR GENERATING A 3D CONE BEAM CT IMAGE 审中-公开
公开(公告)号：EP4375937A1
公开(公告)日：2024-05-29
申请号：EP22209881.6
申请日：2022-11-28
申请人： Koninklijke Philips N.V.
发明人： BRENDEL, Bernhard Johannes , SCHÄFER, Dirk
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , G06T11/008 , G06T11/005
摘要： The present invention relates to an apparatus (10) for estimation of Hounsfield unit values for voxels of a 3D cone beam CT image, the apparatus comprising:
- a processing unit (20); and
- an output unit (30).
A 3D cone beam CT image comprises voxels with associated attenuation coefficient values. The processing unit is configured to calculate a histogram of at least some of the voxels of the 3D cone beam CT image representing a number of voxels having specific attenuation coefficient values or specific ranges of attenuation coefficient values. The processing unit is configured to identify a specific attenuation coefficient value or specific range of attenuation coefficient values associated with a first feature representative of a part of the 3D cone beam CT image, wherein the first feature is air or soft tissue or bone, and wherein the identification comprises utilization of the histogram. The processing unit is configured to determine an attenuation value to Hounsfield Unit converter, wherein the determination of the attenuation value to Hounsfield Unit converter comprises utilization of a correlation between the specific attenuation coefficient value or specific range of attenuation coefficient values associated with the first feature with a Hounsfield Unit for the first feature. The processing unit is configured to transform attenuation coefficient values of voxels in the 3D cone beam CT image to Hounsfield Units based on the attenuation value to Hounsfield Unit converter. The output unit is configured to output information relating to Hounsfield units of voxels of the 3D cone beam CT image.

2. 发明公开

EP4208097A1 SPECTRAL X-RAY MATERIAL DECOMPOSITION METHOD 审中-实审
公开(公告)号：EP4208097A1
公开(公告)日：2023-07-12
申请号：EP21766495.2
申请日：2021-08-31
申请人： Koninklijke Philips N.V.
发明人： SOSSIN, Artur , BRENDEL, Bernhard Johannes
IPC分类号： A61B6/00 , G06N3/04 , G06K9/62

3. 发明公开

EP3940647A1 DEEP LEARNING FOR SLIDING WINDOW PHASE RETRIEVAL 审中-公开
公开(公告)号：EP3940647A1
公开(公告)日：2022-01-19
申请号：EP20185827.1
申请日：2020-07-14
申请人： Koninklijke Philips N.V.
发明人： KOEHLER, Thomas , BRENDEL, Bernhard Johannes , WUELKER, Christian
IPC分类号： G06T11/00
摘要： An image processing system (IPS) and related method for supporting tomographic imaging. The system comprises an input interface (IN) for receiving, for a given projection direction ( p i ), a plurality of input projection images at different phase steps acquired by a tomographic X-ray imaging apparatus configured for dark-field and/or phase-contrast imaging. A machine learning component (MLC) processes the said plurality into output projection imagery that includes a dark-field projection image and/or a phase contrast projection image for the said given projection direction.

4. 发明授权

EP3053143B1 METHOD FOR LOCAL ADJUSTMENT OF REGULARIZATION PARAMETERS FOR IMAGE QUALITY OPTIMIZATION IN FULLY 3D ITERATIVE CT RECONSTRUCTION 有权
公开(公告)号：EP3053143B1
公开(公告)日：2019-03-27
申请号：EP14772346.4
申请日：2014-09-25
申请人： Koninklijke Philips N.V.
发明人： BIPPUS, Rolf Dieter , BRENDEL, Bernhard Johannes
IPC分类号： G06T11/00

5. 发明公开

EP3346922A1 COMPUTER TOMOGRAPHY X-RAY IMAGING 有权
公开(公告)号：EP3346922A1
公开(公告)日：2018-07-18
申请号：EP17765381.3
申请日：2017-09-04
申请人： Koninklijke Philips N.V.
发明人： BRENDEL, Bernhard Johannes , KOEHLER, Thomas , PROKSA, Roland
IPC分类号： A61B6/00 , A61B6/03
CPC分类号： A61B6/482 , A61B6/032 , A61B6/4241 , A61B6/5258
摘要： The present invention relates to computer tomography X-ray imaging. In order to provide further improved data for the reconstruction, a system (10) for computer tomography X-ray imaging is provided. The system comprises a data interface (12) and a processing unit (14). The data interface is configured to provide at least first and second CT X-ray radiation projection data for at least a first and second X-ray energy range, which ranges are different from each other. The processing unit is configured to determine a correction for slice normalization, and to apply an equal slice normalization for the first and the second CT X-ray projection data and thereby generating prepared first and second CT X-ray projection data. For the correction, the equal slice normalization is based on measured data of outer detector elements. Further, the data interface is configured to provide the prepared first and second CT X-ray projection data for further processing. In an example, the system further comprises a computer tomography X-ray imaging acquisition arrangement (20) with an X-ray source (22) configured to generate an X-ray beam, and an X-ray detector (26) configured as an energy discriminating X-ray detector to simultaneously provide X-ray radiation projection data for at least two different X-ray energy ranges separately. The computer tomography X-ray imaging acquisition arrangement is configured to acquire at least the first and second CT X-ray projection data of a region of interest of an object for the at least first and second X-ray energy range.

6. 发明公开

EP3230946A1 STATISTICALLY WEIGHTED REGULARIZATION IN MULTI-CONTRAST IMAGING 审中-公开
标题翻译：多对比成像中的统计加权正则化
公开(公告)号：EP3230946A1
公开(公告)日：2017-10-18
申请号：EP15802048.7
申请日：2015-11-26
申请人： Koninklijke Philips N.V.
发明人： KOEHLER, Thomas , BRENDEL, Bernhard Johannes , BERGNER, Frank
IPC分类号： G06T5/00 , G06T5/50 , G06T11/00
CPC分类号： G06T11/008 , G06T5/002 , G06T5/50 , G06T11/006 , G06T2207/10072 , G06T2207/20221 , G06T2211/408
摘要： An image processing system (IPS) and related method to transform different multi-modal or multi-contrast input images (u,v) into respective transformed images (U, V). The transformation may proceed iteratively to improve a regularized objective function. The regularization is via a regularizer function (R). The regularizer function (R) is computed from noise normalized gradients of the two or more transformed images (u,v).
摘要翻译：一种图像处理系统（IPS）和相关方法，用于将不同的多模式或多种对比度输入图像（u，v）转换成相应的变换图像（U，V）。转换可以迭代地进行，以改善正则化的目标函数。正则化是通过正则化函数（R）。正则化函数（R）是根据两幅或多幅变换图像（u，v）的噪声归一化梯度计算出来的。

7. 发明授权

EP3050028B1 JOINT RECONSTRUCTION OF ELECTRON DENSITY IMAGES. 有权
标题翻译：电子密度影像的联合重建。
公开(公告)号：EP3050028B1
公开(公告)日：2017-07-12
申请号：EP14756059.3
申请日：2014-08-29
申请人： Koninklijke Philips N.V.
发明人： KOEHLER, Thomas , BRENDEL, Bernhard Johannes , ROESSL, Ewald
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , G06T7/0012 , G06T2207/10081 , G06T2211/408 , G06T2211/424
摘要： A method and a related system (IMA) for reconstructing an image of an electron density in a subject PAT. An x-ray radiation imager is used to expose the subject PAT to radiation to receive projection data. The reconstruction method combines projection data from two channels, namely Compton scatter based attenuation data pC and phase shift data pdφ.
摘要翻译：一种用于重建对象PAT中的电子密度的图像的方法和相关系统（IMA）。使用X射线辐射成像仪将主体PAT暴露于辐射以接收投影数据。该重建方法结合了来自两个通道的投影数据，即基于康普顿散射的衰减数据pC和相移数据pdφ。

8. 发明公开

EP2923332A1 PROJECTION DATA DE-NOISING 有权转让
标题翻译：去噪PROJEKTIONSDATEN
公开(公告)号：EP2923332A1
公开(公告)日：2015-09-30
申请号：EP13792502.0
申请日：2013-11-07
申请人： Koninklijke Philips N.V. , Philips GmbH
发明人： BRENDEL, Bernhard Johannes , SHECHTER, Gilad
IPC分类号： G06T5/00
CPC分类号： G06T5/002 , G06K9/00 , G06T11/005 , G06T2207/10072 , G06T2207/10116 , G06T2207/30004
摘要： This application describes an approach to filter, solely in the projection domain, correlated noise from (or de-noise) spectral/multi-energy projection data. As described herein, this can be achieved based at least on variances of the basis material line integrals and a covariance there between, based on multiple correlation coefficients and hyper-planes that describe the noise correlation between different basis material line integrals, and/or otherwise.

9. 发明公开

EP2748798A1 AUTOMATIC DETERMINATION OF REGULARIZATION FACTOR FOR ITERATIVE IMAGE RECONSTRUCTION WITH REGULARIZATION AND/OR IMAGE DE-NOISING 有权转让
标题翻译：对于调节和/或图像降噪图像重建迭代调整因子的自动确定
公开(公告)号：EP2748798A1
公开(公告)日：2014-07-02
申请号：EP12812393.2
申请日：2012-12-04
申请人： Koninklijke Philips N.V. , Philips Deutschland GmbH
发明人： BERGNER, Frank , BRENDEL, Bernhard Johannes , KOEHLER, Thomas
IPC分类号： G06T11/00
CPC分类号： G06T5/00 , G06T11/006 , G06T2207/20004 , G06T2211/424
摘要： A processing component (122) processes images based on an iterative reconstruction algorithm with regularization and/or de-noising algorithm. The processing component includes a set point determiner (224) that determines a quality set point (216) between predetermined lower and upper quality bounds (226) based on a quality variable (228) indicative of an image quality of interest. The processing component further includes a comparator (214) that compares, each processing iteration, a quality metric of a current generated image with the quality set point and generates a difference value indicative of a difference between the quality metric and the quality set point. The processing component further includes a regularization factor updater (220) that generates an updated regularization factor for a next processing iteration based on a current value (222) of the regularization factor and at least the quality metric in response to the difference value indicating that the quality metric is outside of a predetermined range about the quality set point.
摘要翻译：处理组件（122）处理在与正则化和/或去噪算法迭代重建算法基于图像。处理组件包括一组点确定器（224）确实bestimmt预定下限和上限的质量界限之间的质量设定点（216）的基础上一个质量变量（228）指示感兴趣的图像质量的（226）。该处理部件还包括一个比较器（214）做比较，每个处理迭代时，与质量设定点和基因率的差分值指示所述质量度量和质量设定点之间的差的电流所产生的图像的质量度量。该处理部件还包括一个正则化因子更新器（220）确实产生更新的正因子的速率用于指示DASS模具基于所述正则化因子和至少所述质量度量的电流值（222）响应于所述差值的下一个处理迭代质量度量是预定的绕质量设定点的范围之外。

10. 发明公开

EP4012648A1 REDUCTION OF ARTEFACTS IN MEDICAL IMAGES 审中-公开
公开(公告)号：EP4012648A1
公开(公告)日：2022-06-15
申请号：EP20212943.3
申请日：2020-12-10
申请人： Koninklijke Philips N.V.
发明人： KOEHLER, Thomas , BRENDEL, Bernhard Johannes
IPC分类号： G06T5/00 , G06T5/50 , G06T11/00
摘要： A mechanism for generating an artefact estimation image that represents the effect of cone-beam artefacts in a computed tomography (CT) image. This is achieved by identifying the position of gradients (being sudden changes of intensity) in an axis of the CT image parallel to a rotation axis of the CT system that generated the CT image, where each gradient represents a source of a cone-beam artefact. A look-up table is used to individually identify the effect of a cone-beam artefact on areas surrounding each identified position of the gradient, to generate an artefact estimation image.

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