Renal fat fraction and diffusion tensor imaging in patients with early-stage diabetic nephropathy
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To investigate the renal fat fraction and water molecular diffusion features in patients with early-stage DN using Dixon imaging and diffusion tensor imaging (DTI).
Sixty-one type 2 diabetics (normoalbuminuria: n = 40; microalbuminuria: n = 21) and 34 non-diabetic volunteers were included. All participants received three-point Dixon imaging and DTI using a 3.0-T magnetic resonance imager. The fat fraction [FF] and DTI features [fractional anisotropy (FA), apparent diffusion coefficient (ADC), tract counts and length from DTI tractography] were collected. All image features were compared between cohorts using one-way ANOVA with Bonferroni post-hoc analysis.
Renal FF in the microalbuminuric group was significantly higher than in the normoalbuminuric and control groups (5.6% ± 1.3%, 4.7% ± 1.1% and 4.3% ± 0.5%, respectively; p < 0.001). Medullary FA in the microalbuminuric group was the lowest (0.31 ± 0.06) in all cohorts. The tract counts and length in the renal medulla were significantly lower in the microalbuminuric group than in the other two groups.
Dixon imaging and DTI are able to detect renal lipid deposition and water molecule diffusion abnormalities in patients with early-stage DN. Both techniques have the potential to noninvasively evaluate early renal impairment in type 2 diabetes.
• Dixon imaging demonstrated renal fat deposition in early-stage DN;
• Renal fractional anisotropy decreased in patients with early-stage DN;
• Renal tractography demonstrated reduced track counts and length in early-stage DN.
KeywordsAdipose tissue Diffusion tensor imaging Magnetic resonance imaging Observational study Diabetic nephropathies
Apparent Diffusion Coefficient
Body Mass Index
Diffusion Tensor Imaging
Estimated Glomerular Filtration Rate
Functional Magnetic Resonance Imaging
Field of View
Region of Interest
Compliance with ethical standards
The scientific guarantor of this publication is Shenghong Ju.
Conflict of interest
The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
Statistics and biometry
No complex statistical methods were necessary for this paper.
Written informed consent was obtained from all subjects (patients) in this study.
Institutional Review Board approval was obtained.
• performed at one institution
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