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Cancellation of MRI Artifact due to Rotational Motion  

김응규 (한밭대학교 정보통신ㆍ컴퓨터공학부)
Publication Information
Journal of KIISE:Software and Applications / v.31, no.4, 2004 , pp. 411-419 More about this Journal
Abstract
When the imaging object rotates in image plane during MRI scan, its rotation causes phase error and non-uniform sampling to MRI signal. The model of the problem including phase error non-uniform sampling of MRI signal showed that the MRI signals corrupted by rotations about an arbitrary center and the origin in image plane are different in their phases. Therefore the following methods are presented to improve the quality of the MR image which includes the artifact. The first, assuming that the angle of 2-D rotational motion is already known and the position of 2-D rotational center is unknown, an algorithm to correct the artifact which is based on the phase correction is presented. The second, in case of 2-D rotational motion with unknown rotational center and unknown rotational angle, an algorithm is presented to correct the MRI artifact. At this case, the energy of an ideal MR image is minimum outside the boundary of the imaging object to estimate unknown motion parameters and the measured energy increases when the imaging object has an rotation. By using this property, an evaluation function is defined to estimate unknown values of rotational angle at each phase encoding step. Finally, the effectiveness of this presented techniques is shown by using a phantom image with simulated motion and a real image with 2-D translational shift and rotation.
Keywords
MRI; Non-uniform sampling; Rotational motion artifact; Artifact correction;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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