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Motion artifact reduction of diffusion‐weighted MRI of the liver: Use of velocity‐compensated diffusion gradients combined with tetrahedral gradients
Author(s) -
Ozaki Masanori,
Inoue Yusuke,
Miyati Tosiaki,
Hata Hirohumi,
Mizukami Sinya,
Komi Shotaro,
Matsunaga Keiji,
Woodhams Reiko
Publication year - 2013
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.23796
Subject(s) - diffusion mri , nuclear medicine , medicine , magnetic resonance imaging , effective diffusion coefficient , artifact (error) , intravoxel incoherent motion , liver parenchyma , image quality , radiology , nuclear magnetic resonance , physics , image (mathematics) , computer science , computer vision , artificial intelligence
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.