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    IMAGE RECONSTRUCTION USING GRADIENT PROJECTION FOR MEDICAL IMAGING APPLICATIONS
    2.
    发明申请
    IMAGE RECONSTRUCTION USING GRADIENT PROJECTION FOR MEDICAL IMAGING APPLICATIONS 有权
    图像重建使用梯度投影医学成像应用

    公开(公告)号：US20140086467A1

    公开(公告)日：2014-03-27

    申请号：US14006088

    申请日：2012-03-18

    申请人： William Youngjae Song ,  Chunjoo Park ,  Bongyong Song

    发明人： William Youngjae Song ,  Chunjoo Park ,  Bongyong Song

    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。

    RADIATION MODULATOR AND METHODS OF USE AND PRODUCTION THEREOF
    3.
    发明申请
    RADIATION MODULATOR AND METHODS OF USE AND PRODUCTION THEREOF 审中-公开

    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.

    METHODS OF IMAGE RECONSTRUCTION TO REDUCE ARTIFACTS IN RAPID CBCT SCANS
    5.
    发明申请
    METHODS OF IMAGE RECONSTRUCTION TO REDUCE ARTIFACTS IN RAPID CBCT SCANS 有权

    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

    IPC分类号： G06T7/00 ,  G06T7/11 ,  G06T11/00

    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.