Quantification of accuracy and precision of multi-center DTI measurements: A diffusion phantom and human brain study

Tong Zhu, Rui Hu, Xing Qiu, Michael Taylor, Yuen Tso, Constantin Yiannoutsos, Bradford Navia, Susumu Mori, Sven Ekholm, Giovanni Schifitto, Jianhui Zhong

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

The inter-site and intra-site variability of system performance of MRI scanners (due to site-dependent and time-variant variations) can have significant adverse effects on the integration of multi-center DTI data. Measurement errors in accuracy and precision of each acquisition determine both the inter-site and intra-site variability. In this study, multiple scans of an identical isotropic diffusion phantom and of the brain of a traveling human volunteer were acquired at MRI scanners from the same vendor and with similar configurations at three sites. We assessed the feasibility of multi-center DTI studies by direct quantification of accuracy and precision of each dataset. Accuracy was quantified via comparison to carefully constructed gold standard datasets while precision (the within-scan variability) was estimated by wild bootstrap analysis. The results from both the phantom and human data suggest that the inter-site variation in system performance, although relatively small among scanners of the same vendor, significantly affects DTI measurement accuracy and precision and therefore the effectiveness for the integration of multi-center DTI measurements. Our results also highlight the value of a DTI-specific phantom in identifying and quantifying measurement errors due to site-dependent variations in the system performance, and its usefulness for quality assurance/quality control in multi-center DTI studies. In addition, we observed that the within-scan variability of each data acquisition, as assessed by wild bootstrap analysis, is of the same magnitude as the inter-site and intra-site variability. We propose that by weighing datasets based on their variability, as evaluated by wild bootstrap analysis, one can improve the quality of the dataset. This approach will provide a more effective integration of datasets from multi-center DTI studies.

Original languageEnglish (US)
Pages (from-to)1398-1411
Number of pages14
JournalNeuroImage
Volume56
Issue number3
DOIs
StatePublished - Jun 1 2011

Keywords

  • Accuracy
  • DTI
  • Multi-center study
  • Precision
  • Weighting statistics
  • Wild-bootstrap analysis

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

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    Zhu, T., Hu, R., Qiu, X., Taylor, M., Tso, Y., Yiannoutsos, C., Navia, B., Mori, S., Ekholm, S., Schifitto, G., & Zhong, J. (2011). Quantification of accuracy and precision of multi-center DTI measurements: A diffusion phantom and human brain study. NeuroImage, 56(3), 1398-1411. https://doi.org/10.1016/j.neuroimage.2011.02.010