公开(公告)号：US08848977B2

公开(公告)日：2014-09-30

申请号：US13134703

申请日：2011-06-15

申请人： Roland Bammer ,  Christoph Forman ,  Murat Aksoy

发明人： Roland Bammer ,  Christoph Forman ,  Murat Aksoy

IPC分类号： G06K9/00 ,  G06T7/20 ,  G06T7/00 ,  G06K9/32

CPC分类号： G06K9/3216 ,  G06T7/248 ,  G06T7/74 ,  G06T2207/10081 ,  G06T2207/10088 ,  G06T2207/10104 ,  G06T2207/10108 ,  G06T2207/30016

摘要： The tracking and compensation of patient motion during a magnetic resonance imaging (MRI) acquisition is an unsolved problem. A self-encoded marker where each feature on the pattern is augmented with a 2-D barcode is provided. Hence, the marker can be tracked even if it is not completely visible in the camera image. Furthermore, it offers considerable advantages over a simple checkerboard marker in terms of processing speed, since it makes the correspondence search of feature points and marker-model coordinates, which are required for the pose estimation, redundant. Significantly improved accuracy is obtained for both phantom experiments and in-vivo experiments with substantial patient motion. In an alternative aspect, a marker having non-coplanar features can be employed to provide improved motion tracking. Such a marker provides depth cues that can be exploited to improve motion tracking. The aspects of non-coplanar patterns and self-encoded patterns can be practiced independently or in combination.

摘要翻译： 磁共振成像（MRI）采集期间患者运动的跟踪和补偿是未解决的问题。 提供了一种自编码标记，其中图案上的每个特征都用2-D条形码增加。 因此，即使在相机图像中不完全可见，也可以跟踪标记。 此外，它在处理速度方面比简单的棋盘标记提供了显着的优点，因为它使得姿势估计所需的特征点和标记 - 模型坐标的对应搜索是冗余的。 对于具有实质性的患者运动的虚拟实验和体内实验，获得显着提高的精度。 在另一方面，可以使用具有非共面特征的标记来提供改进的运动跟踪。 这样的标记提供可以利用来提高运动跟踪的深度提示。 非共面图案和自编码图案的方面可以独立地或组合地实现。

公开(公告)号：US20120121124A1

公开(公告)日：2012-05-17

申请号：US13134703

申请日：2011-06-15

申请人： Roland Bammer ,  Christoph Forman ,  Murat Aksoy

发明人： Roland Bammer ,  Christoph Forman ,  Murat Aksoy

IPC分类号： G06K9/00

CPC分类号： G06K9/3216 ,  G06T7/248 ,  G06T7/74 ,  G06T2207/10081 ,  G06T2207/10088 ,  G06T2207/10104 ,  G06T2207/10108 ,  G06T2207/30016

摘要： The tracking and compensation of patient motion during a magnetic resonance imaging (MRI) acquisition is an unsolved problem. A self-encoded marker where each feature on the pattern is augmented with a 2-D barcode is provided. Hence, the marker can be tracked even if it is not completely visible in the camera image. Furthermore, it offers considerable advantages over a simple checkerboard marker in terms of processing speed, since it makes the correspondence search of feature points and marker-model coordinates, which are required for the pose estimation, redundant. Significantly improved accuracy relative to a planar checkerboard pattern is obtained for both phantom experiments and in-vivo experiments with substantial patient motion. In an alternative aspect, a marker having non-coplanar features can be employed to provide improved motion tracking. Such a marker provides depth cues that can be exploited to improve motion tracking. The aspects of non-coplanar patterns and self-encoded patterns can be practiced independently or in combination.

摘要翻译： 磁共振成像（MRI）采集期间患者运动的跟踪和补偿是未解决的问题。 提供了一种自编码标记，其中图案上的每个特征都用2-D条形码增加。 因此，即使在相机图像中不完全可见，也可以跟踪标记。 此外，它在处理速度方面比简单的棋盘标记提供了显着的优点，因为它使得姿势估计所需的特征点和标记 - 模型坐标的对应搜索是冗余的。 对于虚拟实验和具有实质性患者运动的体内实验，获得相对于平面棋盘图案的显着提高的精度。 在另一方面，可以使用具有非共面特征的标记来提供改进的运动跟踪。 这样的标记提供可以利用来提高运动跟踪的深度提示。 非共面图案和自编码图案的方面可以独立地或组合地实现。

公开(公告)号：US20160306022A1

公开(公告)日：2016-10-20

申请号：US15086338

申请日：2016-03-31

申请人： Christoph Forman ,  Andreas Greiser

发明人： Christoph Forman ,  Andreas Greiser

IPC分类号： G01R33/567 ,  G01R33/48 ,  G01R33/50

CPC分类号： G01R33/50 ,  G01R33/4835 ,  G01R33/5611 ,  G01R33/56325 ,  G01R33/56333 ,  G01R33/5673

摘要： The embodiments disclosed herein relate to a method for generating time-resolved images of an examination object, which executes a cyclical movement, and to a magnetic resonance device, and a computer program product herefor. According to a first aspect, at least one spatial magnetization pattern with spatial magnetization differences is generated during a magnetization of the examination object. Furthermore, magnetic resonance signals of the examination object are acquired after generating the spatial magnetization pattern throughout at least one cycle of the cyclical movement. At least one k-space is undersampled here during the acquisition of the magnetic resonance signals. Time-resolved images are generated based on the acquired magnetic resonance signals.

摘要翻译： 本文公开的实施例涉及用于生成执行循环运动的检查对象的时间分辨图像的方法，以及用于此的计算机程序产品的方法。 根据第一方面，在检查对象的磁化期间产生具有空间磁化差的至少一个空间磁化模式。 此外，在循环运动的至少一个循环中产生空间磁化模式之后，获取检查对象的磁共振信号。 在获取磁共振信号期间，这里至少有一个k空间欠采样。 基于获取的磁共振信号生成时间分辨图像。

公开(公告)号：US10416257B2

公开(公告)日：2019-09-17

申请号：US15437969

申请日：2017-02-21

申请人： Jens Wetzl ,  Christoph Forman ,  Peter Speier

发明人： Jens Wetzl ,  Christoph Forman ,  Peter Speier

IPC分类号： G01R33/48 ,  G01R33/567

摘要： A method for generating at least one acquisition template for an acquisition of magnetic resonance signals, an acquisition template generating unit, a magnetic resonance apparatus and a computer program product. At least one acquisition template is generated with an acquisition template generating unit. The at least one acquisition template has a plurality of spiral-like spokes in a k-space, each spoke having a plurality of spiral points.

公开(公告)号：US20170242086A1

公开(公告)日：2017-08-24

申请号：US15437969

申请日：2017-02-21

申请人： Jens Wetzl ,  Christoph Forman ,  Peter Speier

发明人： Jens Wetzl ,  Christoph Forman ,  Peter Speier

IPC分类号： G01R33/48 ,  G01R33/567

CPC分类号： G01R33/4824 ,  G01R33/4826 ,  G01R33/5673 ,  G01R33/5676

摘要： A method for generating at least one acquisition template for an acquisition of magnetic resonance signals, an acquisition template generating unit, a magnetic resonance apparatus and a computer program product. At least one acquisition template is generated with an acquisition template generating unit. The at least one acquisition template has a plurality of spiral-like spokes in a k-space, each spoke having a plurality of spiral points.