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Abstract

Effect of motion outside the field of view on functional MR.

F Z Yetkin, V M Haughton, R W Cox, J Hyde, R M Birn, E C Wong and R Prost
American Journal of Neuroradiology June 1996, 17 (6) 1005-1009;
F Z Yetkin
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V M Haughton
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R W Cox
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J Hyde
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R M Birn
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E C Wong
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R Prost
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Abstract

PURPOSE To evaluate the effect of objects moving outside the field of view on functional MR imaging.

METHODS Echo-Planar image sequences were acquired in the sagittal plane of a stationary phantom or of the head of a volunteer subject while a second phantom was moved periodically outside the field of view. The signal intensity changes in each pixel within the field of view were measured.

RESULTS Movement of the phantom outside the field of view produced signal intensity changes in the field of view that equaled or exceeded typical functional activation without the latency that characterizes activation. The greatest changes occurred at the bottom and top edges in the phantom and at the interfaces in the head.

CONCLUSION If temporally correlated with the performance of a task, movement of objects or tissues outside the field of view may produce artifactual changes in signal intensity. The artifactual signal intensity changes were characterized by their location, greater magnitude, and more rapid rise to maximum than seen with typical "activation."

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American Journal of Neuroradiology
Vol. 17, Issue 6
1 Jun 1996
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Cite this article
F Z Yetkin, V M Haughton, R W Cox, J Hyde, R M Birn, E C Wong, R Prost
Effect of motion outside the field of view on functional MR.
American Journal of Neuroradiology Jun 1996, 17 (6) 1005-1009;

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Effect of motion outside the field of view on functional MR.
F Z Yetkin, V M Haughton, R W Cox, J Hyde, R M Birn, E C Wong, R Prost
American Journal of Neuroradiology Jun 1996, 17 (6) 1005-1009;
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