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    • 2. 发明授权
    • Systems and methods for shim current calculation
    • 用于垫片电流计算的系统和方法
    • US09513359B2
    • 2016-12-06
    • US13603210
    • 2012-09-04
    • Kevin Matthew KochEric M. Printz
    • Kevin Matthew KochEric M. Printz
    • G01R33/565G01R33/24
    • G01R33/56563G01R33/243
    • A method includes receiving a forward spatial encoding polarity magnetic resonance (MR) coil image and a reverse spatial encoding polarity MR coil image generated from data obtained with a magnetic field gradient that is reversed with respect to the magnetic field gradient with which the forward spatial encoding polarity MR coil image is acquired. The method also includes performing an iterative shift map calculation algorithm to determine a pixel shift map corresponding to a minimized difference between the forward and reverse spatial encoding polarity MR coil images, converting the pixel shift map into a magnetic field shift map by determining a magnetic field value corresponding to each pixel in the pixel shift map, and providing the magnetic field shift map as an input to a shim calculation process that includes determining a level of at least one shim current.
    • 一种方法包括接收正向空间编码极性磁共振(MR)线圈图像和由相对于磁场梯度反转的磁场梯度获得的数据产生的反向空间编码极性MR线圈图像,所述磁场梯度与前向空间编码 获取极性MR线圈图像。 该方法还包括执行迭代移位映射计算算法以确定对应于正向和反向空间编码极性MR线圈图像之间的最小差异的像素移位图,通过确定磁场来将像素移位图转换为磁场移位图 对应于像素移位图中的每个像素的值,以及提供磁场移动图作为包括确定至少一个平均电流的电平的垫片计算处理的输入。
    • 3. 发明申请
    • SYSTEMS AND METHODS FOR SHIM CURRENT CALCULATION
    • 用于电流计算的系统和方法
    • US20140062475A1
    • 2014-03-06
    • US13603210
    • 2012-09-04
    • Kevin Matthew KochEric M. Printz
    • Kevin Matthew KochEric M. Printz
    • G01R33/56G01R33/341
    • G01R33/56563G01R33/243
    • A method includes receiving a forward spatial encoding polarity magnetic resonance (MR) coil image and a reverse spatial encoding polarity MR coil image generated from data obtained with a magnetic field gradient that is reversed with respect to the magnetic field gradient with which the forward spatial encoding polarity MR coil image is acquired. The method also includes performing an iterative shift map calculation algorithm to determine a pixel shift map corresponding to a minimized difference between the forward and reverse spatial encoding polarity MR coil images, converting the pixel shift map into a magnetic field shift map by determining a magnetic field value corresponding to each pixel in the pixel shift map, and providing the magnetic field shift map as an input to a shim calculation process that includes determining a level of at least one shim current.
    • 一种方法包括接收正向空间编码极性磁共振(MR)线圈图像和由相对于磁场梯度反转的磁场梯度获得的数据产生的反向空间编码极性MR线圈图像,所述磁场梯度与前向空间编码 获取极性MR线圈图像。 该方法还包括执行迭代移位映射计算算法以确定对应于正向和反向空间编码极性MR线圈图像之间的最小差异的像素移位图,通过确定磁场来将像素移位图转换为磁场移位图 对应于像素移位图中的每个像素的值,以及提供磁场移动图作为包括确定至少一个平均电流的电平的垫片计算处理的输入。