Motion artifact reduction of diffusion-weighted MRI of the liver: Use of velocity-compensated diffusion gradients combined with tetrahedral gradients
Article first published online: 14 SEP 2012
Copyright © 2012 Wiley Periodicals, Inc.
Journal of Magnetic Resonance Imaging
Volume 37, Issue 1, pages 172–178, January 2013
How to Cite
Ozaki, M., Inoue, Y., Miyati, T., Hata, H., Mizukami, S., Komi, S., Matsunaga, K. and Woodhams, R. (2013), Motion artifact reduction of diffusion-weighted MRI of the liver: Use of velocity-compensated diffusion gradients combined with tetrahedral gradients. J. Magn. Reson. Imaging, 37: 172–178. doi: 10.1002/jmri.23796
- Issue published online: 17 DEC 2012
- Article first published online: 14 SEP 2012
- Manuscript Accepted: 31 JUL 2012
- Manuscript Received: 25 NOV 2011
- Kitasato University School of Allied Health Sciences. Grant Number: Grant-in-Aid for Research Project, No. 2011-1040
- magnetic resonance imaging;
- diffusion-weighted imaging;
- apparent diffusion coefficient;
- cardiac motion;
- velocity compensation
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.
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.
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.