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公开(公告)号：US20210217140A1
公开(公告)日：2021-07-15
申请号：US16078239
申请日：2017-03-24
摘要： In a method and system for reconstructing computed tomography image data in which CT image data is de-noised. Then simulated noise is added, followed by another de-noising step to estimate the bias. Then, the estimated bias information is used to correct the original de-noised image data to arrive at second pass image data.
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2.发明申请METHOD FOR LOCAL ADJUSTMENT OF REGULARIZATION PARAMETERS FOR IMAGE QUALITY OPTIMIZATION IN FULLY 3D ITERATIVE CT RECONSTRUCTION 有权用于局部调整全尺寸3D重建CT重建图像质量优化的定量参数的方法公开(公告)号：US20160225169A1
公开(公告)日：2016-08-04
申请号：US14917611
申请日：2014-09-25
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , G06T11/006 , G06T2211/424
摘要： A method and related apparatus (116) for iterative reconstruction of a volume. A regularization parameter (β) of an iterative update function is spatially adapted and normalized in respect to a region of interest ROI in the volume. The method allows achieving essentially uniform noise distribution across the reconstructed volume.
摘要翻译： 一种用于体积的迭代重构的方法和相关装置（116）。 迭代更新函数的正则化参数（β）相对于体积中的感兴趣区域ROI进行空间适应和归一化。 该方法允许在重建的体积上实现基本均匀的噪声分布。
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公开(公告)号：US20210295574A1
公开(公告)日：2021-09-23
申请号：US16330415
申请日：2017-09-11
摘要： An imaging method includes obtaining projection data for a helical scan of a subject. The method further includes reconstructing, for a particular time and image slice location of interest, a first temporal motion state image at an earlier time on the detector array and offset from the central row in a first direction with projection data from a first to subset of detector rows, and reconstructing, for the particular time and image slice location, a second temporal motion state image at a later time on the detector array and offset from the central row in a second direction with projection data from a second different subset of detector rows. The method further includes estimating a distortion vector field between the first and second temporal motion state images, and constructing motion compensated volu-metric image data with a motion compensated reconstruction algorithm using the distortion vector field to compensate for arbitrary motion.
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公开(公告)号：US20190188885A1
公开(公告)日：2019-06-20
申请号：US16325268
申请日：2017-08-22
发明人： Michael GRASS , Rolf Dieter BIPPUS , Axel THRAN , Cristian BUERGER , Manindranath VEMBAR , Kevin Martin BROWN
CPC分类号： G06T11/008 , A61B6/032 , A61B6/486 , A61B6/503 , A61B6/5205 , A61B6/5235 , A61B6/5252 , A61B6/5264 , A61B6/5288 , A61B6/541 , G06T3/0068 , G06T3/0081 , G06T5/30 , G06T5/50 , G06T7/10 , G06T7/11 , G06T7/20 , G06T11/006 , G06T2207/10081 , G06T2207/20024 , G06T2207/30048 , G06T2207/30061 , G06T2207/30101
摘要： A medical imaging system (200) includes a masking unit (234), an image registration unit (238), a motion estimator (240) and a motion compensating reconstructor (244). The masking unit constructs a mask for each reconstructed volumetric phase image of a plurality of reconstructed volumetric phase images that masks portions of a corresponding image external to an anatomical model fitted to a segmented at least one anatomical structure, 5 wherein the plurality of reconstructed volumetric phase images include a target phase and a plurality of temporal neighboring phases reconstructed from projection data. The image registration unit registers the masked reconstructed volumetric phase images. The motion estimator estimates motion between the target phase and the plurality of temporal neighboring phases according to the model based on the registered masked reconstructed 10 volumetric phase images. The motion compensating reconstructor reconstructs a motion compensated medical image from the projection data using the estimated motion of the registered masked reconstructed volumetric phase images.
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公开(公告)号：US20170181714A1
公开(公告)日：2017-06-29
申请号：US15316540
申请日：2015-05-26
CPC分类号： A61B6/032 , A61B6/48 , A61B6/481 , A61B6/482 , A61B6/52 , A61B6/5205 , G06T11/003 , G06T11/005 , G06T11/008 , G06T2211/408
摘要： A method includes obtaining a set of energy dependent data generated from a spectral scan. The set of energy dependent data includes a sub-set of data corresponding to only contrast agent. The method further includes separating the sub-set of data from other data of the energy dependent data. The other data includes non-contrast agent data. The method further includes scaling the sub-set of data to change a concentration of the contrast agent in the sub-set of data from that of the sub-set of data. The method further includes visually presenting at least the scaled sub-set of data.
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公开(公告)号：US20230214974A1
公开(公告)日：2023-07-06
申请号：US18018628
申请日：2021-08-01
发明人： Sven KABUS , Rolf Dieter BIPPUS , Heike CAROLUS , Dennis HEIJTEL , Matthijs KRUIS , Amy PERKINS , Steffen RENISCH , Andre Frank SALOMON
CPC分类号： G06T5/50 , G06T11/005 , G06T7/11 , G06T5/002 , G06T2207/20021 , G06T2207/20212 , G06T2207/30004 , G06T2210/41 , G06T2207/10104 , G06T2207/10108 , G06T2207/10081
摘要： A method and system are provided for reconstructing a motion-compensated nuclear image of a subject, as well as an arrangement for method. The reconstruction method comprises receiving nuclear image data the acquiring a nuclear image, and a computer program for carrying out the for multiple motion states, reconstructing the data into an image for each motion state, and calculating a deformation vector field for each state for mapping the image onto a reference motion state. Calculating the deformation vector field comprises providing an initial vector field, defining at least one rigid region of the subject, incorporating that rigid region into the initial vector field, and calculating the deformation vector field with the incorporated rigid region. The method further comprises mapping the reconstructed image of each motion state onto the reference state using the deformation vector fields; and combining the mapped images into a motion-compensated nuclear image.
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公开(公告)号：US20210150778A1
公开(公告)日：2021-05-20
申请号：US16633843
申请日：2018-07-23
发明人： Tanja ELSS , Michael GRASS , Rolf Dieter BIPPUS , Axel THRAN
摘要： Motion compensated reconstruction is currently not well-suited for reconstructing the valve, the valve leaflets and the neighboring vascular anatomy of the heart. Blurring of the valve and the valve leaflets occurs. This may lead to wrong diagnosis. A new approach for motion compensated reconstruction of the valve and the related anatomy is presented in which an edge-enhancing step is performed to suppress blurring.
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公开(公告)号：US20170004637A1
公开(公告)日：2017-01-05
申请号：US15125608
申请日：2015-03-18
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , G06T2211/408 , G06T2211/424
摘要： The invention relates to an image generation apparatus (1) for generating an image of an object. A reconstruction unit (10) reconstructs the image based on provided measured projection values such that costs defined by a cost function are reduced, wherein the cost function depends on differences between calculated projection values, which have been determined by simulating a forward projection through the image, and the provided measured projection values, and wherein a degree of dependence of the cost function on a respective difference depends on the respective difference. This can allow for a consideration of a degree of disturbance of the measured projection values by motion and/or by an incomplete illumination of the object during the reconstruction process, which can lead to a reconstruction of an image having an improved image quality.
摘要翻译： 本发明涉及一种用于生成对象的图像的图像生成装置（1）。 重建单元（10）基于提供的测量投影值重建图像，使得由成本函数定义的成本减小，其中成本函数取决于通过模拟通过图像的向前投影而确定的计算出的投影值之间的差异 和所提供的测量投影值，并且其中成本函数对相应差异的依赖程度取决于相应的差异。 这可以允许通过运动和/或在重建过程期间通过物体的不完全照明来考虑所测量的投影值的一定程度的干扰，这可以导致具有改善的图像质量的图像的重建。
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公开(公告)号：US20190147628A1
公开(公告)日：2019-05-16
申请号：US15546287
申请日：2016-01-20
发明人： Rolf Dieter BIPPUS , Frank BERGNER
摘要： The present invention relates to an image reconstruction system for statistically reconstructing images from transmission measurements. The image reconstruction system comprises an update equation providing unit for providing an update equation based on an iterative statistical model. The update equation comprises a data term and a regularization term. The invention proposes to not modify the regularization term, but rather the weights with which individual measurements contribute are modified on a per image voxel and per measurement basis. This is achieved by modifying the contributions of each measurement by including an additional weight on a per image voxel/per measurement basis. The additional weight for each measurement is determined by calculating the noise perpendicular to each measurement ray at each voxel position and a voxel and measurement dependent weight for each measurement, and integrated into the update equation's data term.
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公开(公告)号：US20180174314A1
公开(公告)日：2018-06-21
申请号：US15574962
申请日：2016-06-17
发明人： Rolf Dieter BIPPUS , Sven KABUS , Michael GRASS
摘要： The invention relates to a registration apparatus (14) for registering images comprising a unit (11) for providing a first and a second image of an object, such that an image element of the first image at a respective position has been reconstructed by multiplying projection data values of rays traversing the image element with weights and by backprojecting the weighted projection data values, a unit (12) for providing a confidence map comprising for different positions in the first image confidence values being indicative of a likelihood that an image feature is caused by a structure of the object, the confidence value being calculated as a sum of a function, which depends on the respective weight, over the rays traversing the respective image element, and a unit (13) for determining a transformation for registering the first and second image to each other under consideration of the confidence map.
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