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Correction of translation induced artifacts in wrist MRI scans using orthogonal acquisitions

文献类型： 会议论文

第一作者： Edward Brian Welch

作者： Edward Brian Welch 1 ; Armando Manduca 2 ;

作者机构： 1.MRI Research Lab

2.Biomathematics Resource

关键词： MRI;motion correction;motion artifacts;orthogonal acquisitions

会议名称： Image processing :

主办单位：

页码： 334-342

摘要： Correction of motion artifacts in MRI due to interview in-plane 2-D rigid body translations is possible using only the raw data of two standard 2DFT images acquired of the same object with phase encode direction swapped. Previous techniques simply use multiple or orthogonal images to reduce artifacts by ghost interference or geometric averaging. The orthogonal k-space phase difference (ORKPHAD) provides an overdetermined system of linear equations that can be solved directly to compensate for the phase errors caused by the translation. This technique was used to correct images of a volunteer's moving wrist. For all slices of the motion corrupted data volumes, artifacts were dramatically reduced. Though the algorithm only accounts for interview translational motion, it is robust enough to correct real in vivo images that may also be corrupted by small amounts of rotational or out-of-plane motion. Experiments underway show the algorithm can tolerate bulk rotation of several degrees between orthogonal image pairs and that corrections using fractional NEX scans are possible. The current results and such ongoing advancements should make this correction technique practical for certain clinical scenarios vulnerable to in-plane translation.

分类号： N55

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