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- Title
Motion artifact reduction of diffusion-weighted MRI of the liver: Use of velocity-compensated diffusion gradients combined with tetrahedral gradients.
- Authors
Ozaki, Masanori; Inoue, Yusuke; Miyati, Tosiaki; Hata, Hirohumi; Mizukami, Sinya; Komi, Shotaro; Matsunaga, Keiji; Woodhams, Reiko
- Abstract
Purpose: To assess the effect of motion artifact reduction on the diffusion-weighted magnetic resonance imaging (DWI-MRI) of the liver, we compared velocity-compensated DWI (VC-DWI) and VC-DWI combined with tetrahedral gradients (t-VC-DWI) to conventional DWI (c-DWI) in the assessment of apparent diffusion coefficients (ADCs) of the liver. Materials and Methods: In 12 healthy volunteers, the liver was scanned with c-DWI, VC-DWI, and t-VC-DWI sequences. The signal-to-noise ratio (SNR) and ADC of the liver parenchyma were measured and compared among sequences. Results: The image quality was visually better for t-VC-DWI than for the others. The SNR for t-VC-DWI was significantly higher than that for VC-DWI ( P < 0.05) and comparable to that for c-DWI. ADCs in both hepatic lobes were significantly lower for t-VC-DWI than for c-DWI ( P < 0.01). ADC in the left lobe was significantly lower for VC-DWI than for c-DWI ( P < 0.01). Although ADC in the left lobe was significantly higher for c-DWI ( P < 0.01), no significant differences in ADCs were found between the right and left lobes for VC-DWI and t-VC-DWI. Conclusion: The use of a t-VC-DWI sequence enables us to correct ADCs of the liver for artificial elevation due to cardiac motion, with preserved SNR. J. Magn. Reson. Imaging 2013;37:172-178. © 2012 Wiley Periodicals, Inc.
- Publication
Journal of Magnetic Resonance Imaging, 2013, Vol 37, Issue 1, p172
- ISSN
1053-1807
- Publication type
Article
- DOI
10.1002/jmri.23796