回波平面成像中ghost伪影的校正
Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 10
Abstract
EPI技术基于方向相反的频率读出梯度交替采集MR信号的奇、偶回波。但是，由于成像物体的磁敏感性、化学位移及磁场B0不均匀性等因素的影响会导致奇、偶回波之间产生相位移动，因而会产生ghost伪影。本文首先用混合空间投影的方法消除部分伪影；然后用基于相位恢复方法消除ghost伪影。实验结果表明运用该方法能够明显地降低ghost伪影的强度，证明了本文方法的有效性。
Authors and Affiliations
Zhiguo GUI , Huazhong SHU
Keywords
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