Effect of number of diffusion encoding directions in neonatal diffusion tensor imaging using Tract‐Based Spatial Statistical analysis

Author:

Merisaari Harri123ORCID,Karlsson Linnea1245,Scheinin Noora M.125,Shulist Satu J.12,Lewis John D.6,Karlsson Hasse125,Tuulari Jetro J.127

Affiliation:

1. FinnBrain Birth Cohort Study, Turku Brain and Mind Center, Department of Clinical Medicine University of Turku Turku Finland

2. Centre for Population Health Research Turku University Central Hospital and University of Turku Turku Finland

3. Department of Radiology Turku University Central Hospital and University of Turku Turku Finland

4. Department of Paediatrics and Adolescent Medicine Turku University Central Hospital and University of Turku Turku Finland

5. Department of Psychiatry Turku University Hospital and University of Turku Turku Finland

6. Montreal Neurological Institute McGill University Montreal Québec Canada

7. Turku Collegium of Science, Medicine and Technology University of Turku Turku Finland

Abstract

AbstractDiffusion tensor imaging (DTI) has been used to study the developing brain in early childhood, infants and in utero studies. In infants, number of used diffusion encoding directions has traditionally been smaller in earlier studies down to the minimum of 6 orthogonal directions. Whereas the more recent studies often involve more directions, number of used directions remain an issue when acquisition time is optimized without compromising on data quality and in retrospective studies. Variability in the number of used directions may introduce bias and uncertainties to the DTI scalar estimates that affect cross‐sectional and longitudinal study of the brain. We analysed DTI images of 133 neonates, each data having 54 directions after quality control, to evaluate the effect of number of diffusion weighting directions from 6 to 54 with interval of 6 to the DTI scalars with Tract‐Based Spatial Statistics (TBSS) analysis. The TBSS analysis was applied to DTI scalar maps, and the mean region of interest (ROI) values were extracted using JHU atlas. We found significant bias in ROI mean values when only 6 directions were used (positive in fractional anisotropy [FA] and negative in fractional anisotropy [MD], axial diffusivity [AD] and fractional anisotropy [RD]), while when using 24 directions and above, the difference to scalar values calculated from 54 direction DTI was negligible. In repeated measures voxel‐wise analysis, notable differences to 54 direction DTI were observed with 6, 12 and 18 directions. DTI measurements from data with at least 24 directions may be used in comparisons with DTI measurements from data with higher numbers of directions.

Funder

Signe ja Ane Gyllenbergin Säätiö

Varsinais-Suomen Sairaanhoitopiiri

Jane ja Aatos Erkon Säätiö

Academy of Finland

Turun Yliopistosäätiö

Alfred Kordelinin Säätiö

Emil Aaltosen Säätiö

Publisher

Wiley

Subject

General Neuroscience

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