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  Intensity standardisation of 7T MR images for intensity-based segmentation of the human hypothalamus

Schindler, S., Schreiber, J., Bazin, P.-L., Trampel, R., Anwander, A., Geyer, S., et al. (2017). Intensity standardisation of 7T MR images for intensity-based segmentation of the human hypothalamus. PLoS One, 12(3): e0173344. doi:10.1371/journal.pone.0173344.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-A4CE-F Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4E9F-2
Genre: Journal Article

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 Creators:
Schindler, Stephanie1, 2, Author              
Schreiber, Jan3, Author              
Bazin, Pierre-Louis2, 4, Author              
Trampel, Robert2, Author              
Anwander, Alfred3, Author              
Geyer, Stefan2, Author              
Schönknecht, Peter1, Author
Affiliations:
1Department of Psychiatry and Psychotherapy, University Hospital Leipzig, Germany, ou_persistent22              
2Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2205649              
3Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              
4Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              

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 Abstract: The high spatial resolution of 7T MRI enables us to identify subtle volume changes in brain structures, providing potential biomarkers of mental disorders. Most volumetric approaches require that similar intensity values represent similar tissue types across different persons. By applying colour-coding to T1-weighted MP2RAGE images, we found that the high measurement accuracy achieved by high-resolution imaging may be compromised by inter-individual variations in the image intensity. To address this issue, we analysed the performance of five intensity standardisation techniques in high-resolution T1-weighted MP2RAGE images. Twenty images with extreme intensities in the GM and WM were standardised to a representative reference image. We performed a multi-level evaluation with a focus on the hypothalamic region-analysing the intensity histograms as well as the actual MR images, and requiring that the correlation between the whole-brain tissue volumes and subject age be preserved during standardisation. The results were compared with T1 maps. Linear standardisation using subcortical ROIs of GM and WM provided good results for all evaluation criteria: it improved the histogram alignment within the ROIs and the average image intensity within the ROIs and the whole-brain GM and WM areas. This method reduced the inter-individual intensity variation of the hypothalamic boundary by more than half, outperforming all other methods, and kept the original correlation between the GM volume and subject age intact. Mixed results were obtained for the other four methods, which sometimes came at the expense of unwarranted changes in the age-related pattern of the GM volume. The mapping of the T1 relaxation time with the MP2RAGE sequence is advertised as being especially robust to bias field inhomogeneity. We found little evidence that substantiated the T1 map's theoretical superiority over the T1-weighted images regarding the inter-individual image intensity homogeneity.

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Language(s): eng - English
 Dates: 2016-04-192017-02-202017-03-02
 Publication Status: Published online
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1371/journal.pone.0173344
PMID: 28253330
PMC: PMC5333904
Other: eCollection 2017
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Title: PLoS One
Source Genre: Journal
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Publ. Info: San Francisco, CA : Public Library of Science
Pages: - Volume / Issue: 12 (3) Sequence Number: e0173344 Start / End Page: - Identifier: ISSN: 1932-6203
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000277850