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High-resolution mechanical imaging of the kidney
Kaspar-Josche Streitberger1, Jing Guo1, Heiko Tzschätzsch1
1Department of Radiology, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Berlin, Germany.
Journal of Biomechanics
|December 21, 2013
Summary
This study demonstrates high-resolution mechanical imaging of the human kidney is feasible. The novel technique provides detailed viscoelastic property maps, useful for detecting kidney conditions.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Nephrology
Background:
- Assessing kidney mechanical properties non-invasively is crucial for diagnosing diseases like fibrosis.
- Previous in vivo imaging lacked sufficient resolution to differentiate kidney regions.
Purpose of the Study:
- To evaluate the feasibility and reproducibility of high-resolution in vivo mechanical imaging of the asymptomatic human kidney.
- To generate detailed maps of kidney viscoelastic parameters.
Main Methods:
- Utilized three-dimensional multifrequency magnetic resonance elastography (MRE) with multifrequency dual elastovisco inversion.
- Analyzed the complex shear modulus magnitude (|G*|) and phase angle (φ) at 2.5mm cubic voxel resolution.
- Examined nine volunteers across three bladder filling states.
Main Results:
- Achieved superior spatial resolution for mechanical parameter maps compared to prior studies.
- Significant regional differences in |G*| and φ were observed in the medulla, cortex, and hilus (P<0.001).
- No significant variations in mechanical properties were found related to bladder filling states.
Conclusions:
- This study presents the first high-resolution viscoelastic parameter maps of human kidney anatomical regions.
- |G*| and φ offer novel insights into kidney viscoelasticity.
- These parameters hold potential for detecting renal lesions and fibrosis.
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