Magnetic resonance elastography of the kidneys: Feasibility and reproducibility in young healthy adults
Article first published online: 18 JUL 2011
Copyright © 2011 Wiley-Liss, Inc.
Journal of Magnetic Resonance Imaging
Volume 34, Issue 4, pages 880–886, October 2011
How to Cite
Rouvière, O., Souchon, R., Pagnoux, G., Ménager, J.-M. and Chapelon, J.-Y. (2011), Magnetic resonance elastography of the kidneys: Feasibility and reproducibility in young healthy adults. J. Magn. Reson. Imaging, 34: 880–886. doi: 10.1002/jmri.22670
- Issue published online: 16 SEP 2011
- Article first published online: 18 JUL 2011
- Manuscript Accepted: 5 MAY 2011
- Manuscript Received: 7 OCT 2010
- Hospices Civils de Lyon (Actions incitatives 2007)
- National Institutes of Health (NIH). Grant Number: EB001981
- SCM IRM Lyon Villeurbanne
- magnetic resonance elastography;
- chronic renal failure;
- healthy volunteers
To evaluate the feasibility and reproducibility of renal magnetic resonance elastography (MRE) in young healthy volunteers.
Materials and Methods:
Ten volunteers underwent renal MRE twice at a 4–5 week interval. The vibrations (45 and 76 Hz) were generated by a speaker positioned beneath the volunteers' back and centered on their left kidney. For each frequency, three sagittal slices were acquired (eight phase offsets per cycle, motion-encoding gradients successively positioned along the three directions of space). Shear velocity images were reconstructed using the curl operator combined with the local frequency estimation (LFE) algorithm.
The mean shear velocities measured in the renal parenchyma during the two examinations were not significantly different and exhibited a mean variation of 6% at 45 Hz and 76 Hz. The mean shear velocities in renal parenchyma were 2.21 ± 0.14 m/s at 45 Hz (shear modulus of 4.9 ± 0.5 kPa) and 3.07 ± 0.17 m/s at 76 Hz (9.4 ± 0.8 kPa, P < 0.01). The mean shear velocities in the renal cortex and medulla were respectively 2.19 ± 0.13 m/s and 2.32 ± 0.16 m/s at 45 Hz (P = 0.002) and 3.06 ± 0.16 m/s and 3.10 ± 0.22 m/s at 76 Hz (P = 0.13).
Renal MRE was feasible and reproducible. Two independent measurements of shear velocities in the renal parenchyma of the same subjects showed an average variability of 6%. J. Magn. Reson. Imaging 2011;. ©2011 Wiley-Liss, Inc.