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公开(公告)号：US09691168B2
公开(公告)日：2017-06-27
申请号：US14006088
申请日：2012-03-18
CPC分类号： G06T11/006 , A61B6/5205 , G06T2211/424
摘要： Techniques and systems are disclosed for estimating an unknown image from a plurality of cone-beam computed tomography (CBCT) image projections. The unknown image is estimated by solving for minima of an expression comprising a fidelity term that is a function of the plurality of image projections and a regularization term that is responsive to a sparsity of the CBCT image projections. The minima of the expression is iteratively estimated by calculating an image gradient of the function, determining a step size based on a based on a Barzilai-Borwein (BB) formulation and adjusting the minima estimate using the projected image gradient and a step size.
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2.发明申请公开(公告)号：US20140086467A1
公开(公告)日：2014-03-27
申请号：US14006088
申请日：2012-03-18
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , A61B6/5205 , G06T2211/424
摘要： Techniques and systems are disclosed for estimating an un-known image from a plurality of cone-beam computed tomography (CBCT) image projections. The unknown image is estimated by solving for minima of an expression comprising a fidelity term that is a function of the plurality of image projections and a regularization term that is responsive to a sparsity of the CBCT image projections. The minima of the expression is iteratively estimated by calculating an image gradient of the function, determining a step size based on a based on a Barzilai-Borwein (BB) formulation and adjusting the minima estimate using the projected image gradient and a step size.
摘要翻译： 公开了用于从多个锥束计算机断层摄影（CBCT）图像投影估计未知图像的技术和系统。 通过求解包括作为多个图像投影的函数的保真度项的表达式的最小值以及响应于CBCT图像投影的稀疏性的规则化项来估计未知图像。 通过计算函数的图像梯度来迭代地估计表达式的最小值，基于基于Barzilai-Borwein（BB）公式的a确定步长，并使用投影图像梯度和步长调整最小估计。
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公开(公告)号：US20200284866A1
公开(公告)日：2020-09-10
申请号：US16813727
申请日：2020-03-09
申请人： Taeho Kim , Chunjoo Park
发明人： Taeho Kim , Chunjoo Park
IPC分类号： G01R33/565 , G01R33/48 , G01R33/561 , G06N3/08 , G06T7/00 , G06T19/20 , A61B5/055
摘要： Among the various aspects of the present disclosure is the provision of methods and systems for real-time 3D MRI that combines dynamic keyhole data sharing with super-resolution imaging methods to improve real-time 3D MR images in the presence of motion.
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公开(公告)号：US20210264591A1
公开(公告)日：2021-08-26
申请号：US17187648
申请日：2021-02-26
申请人： Chunjoo Park , Bin Cai , Sasa Mutic
发明人： Chunjoo Park , Bin Cai , Sasa Mutic
摘要： A computer-implemented method for correcting artifacts within CT images of a subject includes providing iteratively correcting a CT volumetric image with a high-contrast mask by overpainting the high-contrast mask within CT volumetric image set by evaluating a model function and updating the CT projections to reflect the overpainting using a gradient descent based on previous overpainted CT projections, back-projecting the corrected CT projections to produce a corrected volumetric image set, and comparing the corrected CT volumetric image set against a previous corrected CT volumetric image set until convergence. The original voxels overpainted by the high-contrast mask are re-inserted into the converged CT volumetric image to produce the final CT volumetric image set.
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公开(公告)号：US11294014B2
公开(公告)日：2022-04-05
申请号：US16813727
申请日：2020-03-09
申请人： Taeho Kim , Chunjoo Park
发明人： Taeho Kim , Chunjoo Park
IPC分类号： G01R33/565 , G01R33/48 , G01R33/561 , G06N3/08 , G06T7/00 , A61B5/055 , G06T19/20
摘要： Among the various aspects of the present disclosure is the provision of methods and systems for real-time 3D MRI that combines dynamic keyhole data sharing with super-resolution imaging methods to improve real-time 3D MR images in the presence of motion.
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公开(公告)号：US20200034948A1
公开(公告)日：2020-01-30
申请号：US16525562
申请日：2019-07-29
申请人： Chunjoo Park , Sasa Mutic , Hao Zhang , Olga Green
发明人： Chunjoo Park , Sasa Mutic , Hao Zhang , Olga Green
摘要： The present disclosure describes a computer-implemented method of transforming a low-resolution MR image to a high-resolution MR image using a deep CNN-based MRI SR network and a computer-implemented method of transforming an MR image to a pseudo-CT (sCT) image using a deep CNN-based sCT network. The present disclosure further describes a MR image-guided radiation treatment system that includes a computing device to implement the MRI SR and CT networks and to produce a radiation plan based in the resulting high resolution MR images and sCT images.
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公开(公告)号：US11823380B2
公开(公告)日：2023-11-21
申请号：US17187648
申请日：2021-02-26
申请人： Chunjoo Park , Bin Cai , Sasa Mutic
发明人： Chunjoo Park , Bin Cai , Sasa Mutic
CPC分类号： G06T7/0012 , G06T7/11 , G06T11/008 , G06T2207/10081 , G06T2207/20081
摘要： A computer-implemented method for correcting artifacts within CT images of a subject includes providing iteratively correcting a CT volumetric image with a high-contrast mask by overpainting the high-contrast mask within CT volumetric image set by evaluating a model function and updating the CT projections to reflect the overpainting using a gradient descent based on previous overpainted CT projections, back-projecting the corrected CT projections to produce a corrected volumetric image set, and comparing the corrected CT volumetric image set against a previous corrected CT volumetric image set until convergence. The original voxels overpainted by the high-contrast mask are re-inserted into the converged CT volumetric image to produce the final CT volumetric image set.
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公开(公告)号：US20180318603A1
公开(公告)日：2018-11-08
申请号：US15972907
申请日：2018-05-07
申请人： Chunjoo Park , Sasa Mutic , Hao Zhang
发明人： Chunjoo Park , Sasa Mutic , Hao Zhang
IPC分类号： A61N5/10
CPC分类号： A61N5/1016 , A61N5/1007 , A61N5/1027 , A61N5/1039 , A61N2005/1003
摘要： The present disclosure is directed to a computer-implemented method for designing a patient-specific brachytherapy (BT) tandem applicator. The method is implemented using at least one processor in communication with at least one memory. The method includes receiving a radiation treatment plan for treating a region of interest. The radiation treatment plan includes a prescribed radiation dosage and patient anatomical data of the region of interested to be treated. The method also includes applying an inverse planning optimization model to determine an optimal thickness of an interior surface of the tandem applicator at a plurality of dwell positions within the region of interest. The method also includes generating a schedule of dwell times for the tandem applicator based on the generated position-dependent thickness profile. The method also includes transmitting design instructions to a 3D printer for fabrication of the tandem applicator.
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