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  Quality assessment of MEG-to-MRI coregistrations

Sonntag, H., Haueisen, J., & Maess, B. (2018). Quality assessment of MEG-to-MRI coregistrations. Physics in Medicine and Biology, 63(7): 075003. doi:10.1088/1361-6560/aab248.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-25C2-A Version Permalink: http://hdl.handle.net/21.11116/0000-0004-E24A-A
Genre: Journal Article

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Sonntag, Hermann1, Author              
Haueisen, Jens2, Author
Maess, Burkhard1, Author              
Affiliations:
1Methods and Development Group MEG and EEG - Cortical Networks and Cognitive Functions, MPI for Human Cognitive and Brain Sciences, Max Planck Society, Leipzig, DE, ou_2205650              
2Institute for Biomedical Engineering and Informatics, TU Ilmenau, Germany, ou_persistent22              

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 Abstract: For high precision in source reconstruction of magnetoencephalography (MEG) or electroencephalography data, high accuracy of the coregistration of sources and sensors is mandatory. Usually, the source space is derived from magnetic resonance imaging (MRI). In most cases, however, no quality assessment is reported for sensor-to-MRI coregistrations. If any, typically root mean squares (RMS) of point residuals are provided. It has been shown, however, that RMS of residuals do not correlate with coregistration errors. We suggest using target registration error (TRE) as criterion for the quality of sensor-to-MRI coregistrations. TRE measures the effect of uncertainty in coregistrations at all points of interest. In total, 5544 data sets with sensor-to-head and 128 head-to-MRI coregistrations, from a single MEG laboratory, were analyzed. An adaptive Metropolis algorithm was used to estimate the optimal coregistration and to sample the coregistration parameters (rotation and translation). We found an average TRE between 1.3 and 2.3 mm at the head surface. Further, we observed a mean absolute difference in coregistration parameters between the Metropolis and iterative closest point algorithm of $(1.9 \pm 15){\hspace{0pt}}^{\circ}$ and $(1.1 \pm 9)$ m. A paired sample t-test indicated a significant improvement in goal function minimization by using the Metropolis algorithm. The sampled parameters allowed computation of TRE on the entire grid of the MRI volume. Hence, we recommend the Metropolis algorithm for head-to-MRI coregistrations.

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Language(s): eng - English
 Dates: 2017-10-112018-02-262018-03-222018-04
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1088/1361-6560/aab248
PMID: 29480813
 Degree: -

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Title: Physics in Medicine and Biology
  Other : Phys. Med. Biol.
Source Genre: Journal
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Publ. Info: London? : IOP Pub.
Pages: - Volume / Issue: 63 (7) Sequence Number: 075003 Start / End Page: - Identifier: ISSN: 0031-9155
CoNE: https://pure.mpg.de/cone/journals/resource/954925433410