Correction of artifacts caused by maxwell terms in slice offset echo
planar imaging
    1.
    发明授权
    Correction of artifacts caused by maxwell terms in slice offset echo planar imaging 有权
    校正由切片偏移回波平面成像中的maxwell项引起的假象

    公开(公告)号:US06064205A

    公开(公告)日:2000-05-16

    申请号:US265259

    申请日:1999-03-09

    CPC分类号: G01R33/56581 G01R33/56554

    摘要: Two methods are disclosed to remove the image artifacts produced by Maxwell terms arising from the imaging gradients in an echo planar imaging pulse sequence. In the first method, the frequency and phase errors caused by the Maxwell terms are calculated on an individual slice basis and subsequently compensated during data acquisition by dynamically adjusting the receiver frequency and phase. In the second method, two linear phase errors, one in the readout direction and the other in the phase-encoding direction, both of which arise from the Maxwell terms, are calculated on an individual-slice basis. These errors are compensated for in the k-space data after data acquisition.

    摘要翻译: 公开了两种方法来去除由回波平面成像脉冲序列中的成像梯度引起的由麦克斯韦尔产生的图像伪影。 在第一种方法中,由麦克斯韦尔项引起的频率和相位误差在单独的切片基础上计算,并随后通过动态调整接收机频率和相位在数据采集期间进行补偿。 在第二种方法中,以单个切片为基础计算两个线性相位误差,一个在读出方向上,另一个在相位编码方向上,两个来自麦克斯韦术语。 这些误差在数据采集后的k空间数据中得到补偿。