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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
17:06

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Published on: November 8, 2012

Effect of scanner in asymmetry studies using diffusion tensor imaging.

Hidemasa Takao1, Naoto Hayashi, Kuni Ohtomo

  • 1Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. takaoh-tky@umin.ac.jp

Neuroimage
|September 21, 2010
PubMed
Summary
This summary is machine-generated.

Using identical MRI scanners, this study found that differences between machines and hardware upgrades significantly impact diffusion tensor imaging (DTI) measurements of brain asymmetry over time. This variability affects longitudinal studies.

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Area of Science:

  • Neuroimaging
  • Diffusion Tensor Imaging (DTI)
  • Medical Physics

Background:

  • Longitudinal studies in neuroimaging require consistent data acquisition.
  • Scanner hardware drift, inter-scanner variability, and upgrades can introduce biases.
  • Understanding these factors is crucial for accurate interpretation of diffusion properties.

Purpose of the Study:

  • To evaluate the impact of scanner hardware drift and inter-scanner variability on diffusion property asymmetries.
  • To assess the effect of scanner upgrades on fractional anisotropy (FA) and mean diffusivity (MD) asymmetries.
  • To analyze longitudinal data from two identical 3.0-T MRI scanners.

Main Methods:

  • Utilized longitudinal data from 224 healthy subjects scanned twice, approximately one year apart.
  • Employed two identical 3.0-T MRI scanners from the same manufacturer.
  • Applied tract-based spatial statistics (TBSS) to analyze fractional anisotropy (FA) and mean diffusivity (MD) asymmetries.

Main Results:

  • Significant longitudinal changes in FA and MD asymmetries were observed when scans were performed on different scanners.
  • Inter-scanner variability (bias) substantially affected FA and MD asymmetries, despite using identical scanner models.
  • Scanner upgrades had a minimal impact on FA and MD asymmetries.

Conclusions:

  • Using multiple scanners, even of the same model, increases variability in DTI asymmetry measurements.
  • Inter-scanner variability poses a significant challenge for longitudinal DTI asymmetry studies.
  • Findings highlight the need for careful calibration and consideration of scanner effects in DTI research.