Methods and systems to determine respiratory phase and motion state during guided radiation therapy

    公开(公告)号:US10806947B2

    公开(公告)日:2020-10-20

    申请号:US15277198

    申请日:2016-09-27

    Abstract: Methods and systems using magnetic resonance and ultrasound for tracking anatomical targets for radiation therapy guidance are provided. One system includes a patient transport configured to move a patient between and into a magnetic resonance (MR) system and a radiation therapy (RT) system. An ultrasound transducer is also provided that is hands-free and electronically steerable, securely attached to the patient, such that the ultrasound transducer is configured to acquire four-dimensional (4D) ultrasound images concurrently with one of an MR acquisition or an RT radiation therapy session. The system also includes a controller having a processor configured to use the 4D ultrasound images and MR images from the MR system to control at least one of a photon beam spatial distribution or intensity modulation generated by the RT system. The system determines the previously-acquired correct MR images that represent a specific motion state at some time, t, by a plurality of transformations that allow the representation of the position of fiducial markers in the corresponding ultrasound images to match that of a prior ultrasound acquisition.

    Method and apparatus for automated tracking of vessel movement using MR imaging
    6.
    发明授权
    Method and apparatus for automated tracking of vessel movement using MR imaging 有权
    使用MR成像自动跟踪血管运动的方法和装置

    公开(公告)号:US08700125B2

    公开(公告)日:2014-04-15

    申请号:US13746983

    申请日:2013-01-22

    Abstract: A system and method is disclosed for tracking a moving object using magnetic resonance imaging. The technique includes acquiring a scout image scan having a number of image frames and extracting non-linear motion parameters from the number of image frames of the scout image scan. The technique includes prospectively shifting slice location using the non-linear motion parameters between slice locations while acquiring a series of MR images. The system and method are particularly useful in tracking coronary artery movement during the cardiac cycle to acquire the non-linear components of coronary artery movement during a diastolic portion of the R-R interval.

    Abstract translation: 公开了一种使用磁共振成像跟踪运动物体的系统和方法。 该技术包括获取具有多个图像帧的侦察图像扫描,并从侦察图像扫描的图像帧的数量中提取非线性运动参数。 该技术包括使用切片位置之间的非线性运动参数前进移位切片位置,同时获取一系列MR图像。 该系统和方法在心脏周期期间跟踪冠状动脉运动特别有用,以在R-R间期的舒张期期间获得冠状动脉运动的非线性分量。

    SYSTEM AND METHOD FOR MANUFACTURING MAGNETIC RESONANCE IMAGING GRADIENT COIL ASSEMBLIES

    公开(公告)号:US20180100905A1

    公开(公告)日:2018-04-12

    申请号:US15840451

    申请日:2017-12-13

    CPC classification number: G01R33/3858 G01R33/3856 H01F41/04

    Abstract: The embodiments disclosed herein relate generally to magnetic resonance imaging systems and, more specifically, to the manufacturing of a gradient coil assembly for magnetic resonance imaging (MRI) systems. For example, in one embodiment, a method of manufacturing a gradient coil assembly for a magnetic resonance imaging system includes depositing a first layer comprising a base material onto a surface to form a substrate and depositing a second layer onto the first layer. The second layer may enable bonding between a conductor material and the substrate. The method also includes depositing a third layer onto the second layer using a consolidation process. The consolidation process uses the conductor material to form at least a portion of a gradient coil.

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