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1. 发明授权

US06894494B2 Method and device for correcting organ motion artifacts in MRI systems 失效
标题翻译：用于校正MRI系统中器官运动伪像的方法和装置
公开(公告)号：US06894494B2
公开(公告)日：2005-05-17
申请号：US10608141
申请日：2003-06-30
申请人： Stergios Stergiopoulos , Miroslaw Wrobel , Andreas Freibert , Waheed Younis , Amar Dhanantwari
发明人： Stergios Stergiopoulos , Miroslaw Wrobel , Andreas Freibert , Waheed Younis , Amar Dhanantwari
IPC分类号： G01R33/567 , G01V3/00
CPC分类号： G01R33/5673 , G01R33/56325
摘要： The present invention relates to a signal processing method and system for correcting organ motion artifacts for cardiac and brain imaging. A plurality of sets of MRI measurement data indicative of at least an image of an object is received. Each set corresponds to one row kx of a k-space matrix of at least a k-space matrix. For each set a k-space matrix of the at least a k-space matrix is determined for allocation thereto based on motion information of the object occurring during acquisition of the plurality of sets of the MRI measurement data. In a following step a location within the allocated k-space matrix corresponding to a row of the k-space matrix allocated thereto is determined for each set. At least a k-space matrix is then generated by re-arranging the plurality of sets. Each of the at least a k-space matrix comprises the sets of the plurality of sets of the MRI measurement data allocated thereto. Inverse Fourier transforming of the plurality of k-space matrices provides at least a reconstructed image. Through careful selection of the phases of the cardiac and respiratory cycles and corresponding ranges MRI data acquisition periods are of the order of seconds or a few minutes. Furthermore, integration of motion artifact free MRI images of different phases of organ motion using the coherent k-space synthesis according to the invention allows provision of an animation showing different phases of a cardiac or lung cycle. In an embodiment for correcting motion artifacts for brain imaging a motion vector describing translational and rotational motion of a patient's head is tracked during the MRI data acquisition process. The motion artifacts are then corrected based on coherent k-space synthesis using the motion vector data.
摘要翻译：本发明涉及用于校正心脏和脑成像的器官运动假象的信号处理方法和系统。接收指示对象的至少一个图像的多组MRI测量数据。每个集合对应于至少一个k空间矩阵的k空间矩阵的一行k×××。对于每个集合，基于在获取多组MRI测量数据的采集期间发生的对象的运动信息，确定至少k空间矩阵的k空间矩阵用于分配。在随后的步骤中，针对每个集合确定与分配给其的k空间矩阵的行相对应的所分配的k空间矩阵内的位置。然后，通过重新排列多个集合来生成至少一个k空间矩阵。所述至少k空间矩阵中的每一个包括分配给其的所述多个MRI测量数据的集合。多个k空间矩阵的逆傅立叶变换提供至少一个重构图像。通过仔细选择心脏和呼吸周期的相位和相应范围，MRI数据采集周期大约为数秒或数分钟。此外，使用根据本发明的相干k空间合成的器官运动的不同阶段的运动伪像自由MRI图像的集成允许提供显示心脏或肺循环的不同阶段的动画。在用于校正脑成像的运动伪像的实施例中，描述了在MRI数据采集过程期间描述患者头部的平移和旋转运动的运动矢量。然后基于使用运动矢量数据的相干k空间合成校正运动假象。

2. 发明授权

US07085342B2 Method for tracking motion phase of an object for correcting organ motion artifacts in X-ray CT systems 失效
标题翻译：跟踪X射线CT系统中器官运动伪像的物体运动相位的方法
公开(公告)号：US07085342B2
公开(公告)日：2006-08-01
申请号：US10829185
申请日：2004-04-22
申请人： Waheed Younis , Storgios Stergiopoulos
发明人： Waheed Younis , Storgios Stergiopoulos
IPC分类号： G01N23/00
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/412
摘要： The present invention relates to a method for tracking motion phase of an object. A plurality of projection data indicative of a cross-sectional image of the object is received. The projection data are processed for determining motion projection data of the object indicative of motion of the object based on the attenuation along at least a same line through the object at different time instances. A motion phase of the object with the object having the least motion is selected. Finally, projection data acquired at time instances within the selected motion phase of the object are selected for tomographical image reconstruction. Reconstructed images clearly show a substantial improvement in image quality by successfully removing motion artifacts using the method for tracking motion phase of an object according to the invention. The method is highly beneficial in cardiac imaging using X-ray CT scan.
摘要翻译：本发明涉及一种跟踪物体运动相位的方法。接收表示对象的横截面图像的多个投影数据。处理投影数据，用于基于在不同时间实例沿着至少相同的线穿过对象的衰减来确定指示对象的运动的对象的运动投影数据。选择具有最小运动的物体的物体的运动相位。最后，选择在对象的所选运动阶段内的时间实例获取的投影数据用于层析图像重建。通过使用根据本发明的跟踪运动相位的方法成功地去除运动伪影，重建的图像清楚地显示出图像质量的显着改善。该方法在使用X射线CT扫描的心脏成像中是非常有益的。

3. 发明申请

US20050238135A1 Method for tracking motion phase of an object for correcting organ motion artifacts in X-ray CT systems 失效
标题翻译：跟踪X射线CT系统中器官运动伪像的物体运动相位的方法
公开(公告)号：US20050238135A1
公开(公告)日：2005-10-27
申请号：US10829185
申请日：2004-04-22
申请人： Waheed Younis , Storgios Stergiopoulos
发明人： Waheed Younis , Storgios Stergiopoulos
IPC分类号： A61B6/00 , G21K1/12
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/412
摘要： The present invention relates to a method for tracking motion phase of an object. A plurality of projection data indicative of a cross-sectional image of the object is received. The projection data are processed for determining motion projection data of the object indicative of motion of the object based on the attenuation along at least a same line through the object at different time instances. A motion phase of the object with the object having the least motion is selected. Finally, projection data acquired at time instances within the selected motion phase of the object are selected for tomographical image reconstruction. Reconstructed images clearly show a substantial improvement in image quality by successfully removing motion artifacts using the method for tracking motion phase of an object according to the invention. The method is highly beneficial in cardiac imaging using X-ray CT scan.
摘要翻译：本发明涉及一种跟踪物体运动相位的方法。接收表示对象的横截面图像的多个投影数据。处理投影数据，用于基于在不同时间实例沿着至少相同的线穿过对象的衰减来确定指示对象的运动的对象的运动投影数据。选择具有最小运动的物体的物体的运动相位。最后，选择在对象的所选运动阶段内的时间实例获取的投影数据用于层析图像重建。通过使用根据本发明的跟踪运动相位的方法成功地去除运动伪影，重建的图像清楚地显示出图像质量的显着改善。该方法在使用X射线CT扫描的心脏成像中是非常有益的。

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