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

L Muresan, R. Renken, J.B.T.M. Roerdink, H. Duifhuis

OnderzoeksoutputAcademicpeer review

30 Citaten (Scopus)
422 Downloads (Pure)

Samenvatting

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. In order 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.
Originele taal-2English
Pagina's (van-tot)1450-1460
Aantal pagina's11
TijdschriftIeee transactions on biomedical engineering
Volume52
Nummer van het tijdschrift8
DOI's
StatusPublished - aug.-2005

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