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ABSTRACT: Purpose
To compare registration strategies to align arterial spin labeling (ASL) with 3D T1-weighted (T1w) images, with the goal of reducing the between-subject variability of cerebral blood flow (CBF) images.Materials and methods
Multi-center 3T ASL data were collected at eight sites with four different sequences in the multi-center GENetic Frontotemporal dementia Initiative (GENFI) study. In a total of 48 healthy controls, we compared the following image registration options: (I) which images to use for registration (perfusion-weighted images [PWI] to the segmented gray matter (GM) probability map (pGM) (CBF-pGM) or M0 to T1w (M0-T1w); (II) which transformation to use (rigid-body or non-rigid); and (III) whether to mask or not (no masking, M0-based FMRIB software library Brain Extraction Tool [BET] masking). In addition to visual comparison, we quantified image similarity using the Pearson correlation coefficient (CC), and used the Mann-Whitney U rank sum test.Results
CBF-pGM outperformed M0-T1w (CC improvement 47.2% ± 22.0%; P < 0.001), and the non-rigid transformation outperformed rigid-body (20.6% ± 5.3%; P < 0.001). Masking only improved the M0-T1w rigid-body registration (14.5% ± 15.5%; P = 0.007).Conclusion
The choice of image registration strategy impacts ASL group analyses. The non-rigid transformation is promising but requires validation. CBF-pGM rigid-body registration without masking can be used as a default strategy. In patients with expansive perfusion deficits, M0-T1w may outperform CBF-pGM in sequences with high effective spatial resolution. BET-masking only improves M0-T1w registration when the M0 image has sufficient contrast.Level of evidence
1 Technical Efficacy: Stage 1 J. Magn. Reson. Imaging 2018;47:131-140.
SUBMITTER: Mutsaerts HJMM
PROVIDER: S-EPMC6485386 | biostudies-literature | 2018 Jan
REPOSITORIES: biostudies-literature
Mutsaerts Henri J M M HJMM Petr Jan J Thomas David L DL De Vita Enrico E Cash David M DM van Osch Matthias J P MJP Golay Xavier X Groot Paul F C PFC Ourselin Sebastien S van Swieten John J Laforce Robert R Tagliavini Fabrizio F Borroni Barbara B Galimberti Daniela D Rowe James B JB Graff Caroline C Pizzini Francesca B FB Finger Elizabeth E Sorbi Sandro S Castelo Branco Miguel M Rohrer Jonathan D JD Masellis Mario M MacIntosh Bradley J BJ
Journal of magnetic resonance imaging : JMRI 20170508 1
<h4>Purpose</h4>To compare registration strategies to align arterial spin labeling (ASL) with 3D T1-weighted (T1w) images, with the goal of reducing the between-subject variability of cerebral blood flow (CBF) images.<h4>Materials and methods</h4>Multi-center 3T ASL data were collected at eight sites with four different sequences in the multi-center GENetic Frontotemporal dementia Initiative (GENFI) study. In a total of 48 healthy controls, we compared the following image registration options: ( ...[more]