Korean J Radiol.  2015 Apr;16(2):297-303. 10.3348/kjr.2015.16.2.297.

Effects of MR Parameter Changes on the Quantification of Diffusion Anisotropy and Apparent Diffusion Coefficient in Diffusion Tensor Imaging: Evaluation Using a Diffusional Anisotropic Phantom

Affiliations
  • 1Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, Korea. sjkimjb@amc.seoul.kr
  • 2Department of Biostatistics, University of Ulsan College of Medicine, Seoul 138-736, Korea.
  • 3Department of Radiology, East-West Neomedical Center, Kyung Hee University College of Medicine, Seoul 134-727, Korea.
  • 4Clinical Scientist, MR, Philips Healthcare, Seoul 140-200, Korea.

Abstract


OBJECTIVE
To validate the usefulness of a diffusional anisotropic capillary array phantom and to investigate the effects of diffusion tensor imaging (DTI) parameter changes on diffusion fractional anisotropy (FA) and apparent diffusion coefficient (ADC) using the phantom.
MATERIALS AND METHODS
Diffusion tensor imaging of a capillary array phantom was performed with imaging parameter changes, including voxel size, number of sensitivity encoding (SENSE) factor, echo time (TE), number of signal acquisitions, b-value, and number of diffusion gradient directions (NDGD), one-at-a-time in a stepwise-incremental fashion. We repeated the entire series of DTI scans thrice. The coefficients of variation (CoV) were evaluated for FA and ADC, and the correlation between each MR imaging parameter and the corresponding FA and ADC was evaluated using Spearman's correlation analysis.
RESULTS
The capillary array phantom CoVs of FA and ADC were 7.1% and 2.4%, respectively. There were significant correlations between FA and SENSE factor, TE, b-value, and NDGD, as well as significant correlations between ADC and SENSE factor, TE, and b-value.
CONCLUSION
A capillary array phantom enables repeated measurements of FA and ADC. Both FA and ADC can vary when certain parameters are changed during diffusion experiments. We suggest that the capillary array phantom can be used for quality control in longitudinal or multicenter clinical studies.

Keyword

Diffusion tensor imaging; Fractional anisotropy; Apparent diffusion coefficient; Phantom study; Magnetic resonance imaging
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