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Automated correction of spin-history related motion artefacts in fMRI: Simulated and phantom data

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4 Author(s)
Muresan, L. ; Inst. for Behavioral & Cognitive Neurosci.s, Univ. of Groningen, Netherlands ; Renken, R. ; Roerdink, J.B.T.M. ; Duifhuis, H.

This paper concerns the problem of correcting spin-history artefacts in fMRI data. We focus on the influence of through-plane motion on the history of magnetization. A change in object position will disrupt the tissue's steady-state magnetization. The disruption will propagate to the next few acquired volumes until a new steady state is reached. In this paper we present a simulation of spin-history effects, experimental data, and an automatic two-step algorithm for detecting and correcting spin-history artefacts. The algorithm determines the steady-state distribution of all voxels in a given slice and indicates which voxels need a spin-history correction. The spin-history correction is meant to be applied before standard realignment procedures. To obtain experimental data a special phantom and an MRI compatible motion system were designed. The effect of motion on spin-history is presented for data obtained using this phantom inside a 1.5-T MRI scanner. We show that the presented algorithm is capable of detecting the occurrence of a displacement, and it determines which voxels need a spin-history correction. The results of the phantom study show good agreement with the simulations.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:52 ,  Issue: 8 )