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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Effects of MR parameter changes on the quantification of diffusion anisotropy and apparent diffusion coefficient in

Sang Joon Kim1, Choong Gon Choi1, Jeong Kon Kim1

  • 1Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, Korea.

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Summary

A novel capillary array phantom allows for reliable diffusion tensor imaging (DTI) measurements. Changes in DTI parameters like b-value and echo time significantly affect fractional anisotropy (FA) and apparent diffusion coefficient (ADC).

Keywords:
Apparent diffusion coefficientDiffusion tensor imagingFractional anisotropyMagnetic resonance imagingPhantom study

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Area of Science:

  • Medical Imaging
  • Neuroimaging
  • Biophysics

Background:

  • Diffusion Tensor Imaging (DTI) is crucial for assessing tissue microstructure.
  • Standardizing DTI acquisition parameters is essential for reproducible results.
  • Anisotropic phantoms are needed for validating DTI metrics.

Purpose of the Study:

  • To validate a capillary array phantom for DTI.
  • To investigate the impact of DTI parameter variations on fractional anisotropy (FA) and apparent diffusion coefficient (ADC).

Main Methods:

  • DTI scans of a capillary array phantom were performed.
  • Imaging parameters (voxel size, SENSE factor, TE, signal acquisitions, b-value, NDGD) were systematically altered.
  • Coefficients of variation (CoV) for FA and ADC were calculated, and Spearman's correlation analysis was used.

Main Results:

  • The phantom demonstrated low CoVs for FA (7.1%) and ADC (2.4%).
  • Significant correlations were found between FA and SENSE factor, TE, b-value, and NDGD.
  • ADC showed significant correlations with SENSE factor, TE, and b-value.

Conclusions:

  • The capillary array phantom is suitable for reproducible FA and ADC measurements.
  • DTI parameters critically influence FA and ADC values.
  • This phantom can serve as a quality control tool for longitudinal and multicenter DTI studies.