Renal fat fraction and diffusion tensor imaging in patients with early-stage diabetic nephropathy

  • Yuan-Cheng Wang
  • Yinglian Feng
  • Chun-Qiang Lu
  • Shenghong Ju
Magnetic Resonance
  • 7 Downloads

Abstract

Objective

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).

Methods

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.

Results

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.

Conclusions

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.

Key points

• 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.

Keywords

Adipose tissue Diffusion tensor imaging Magnetic resonance imaging Observational study Diabetic nephropathies 

Abbreviations

ADC

Apparent Diffusion Coefficient

BMI

Body Mass Index

DN

Diabetic Nephropathy

DTI

Diffusion Tensor Imaging

eGFR

Estimated Glomerular Filtration Rate

FA

Fractional Anisotropy

FF

Fat Fraction

fMRI

Functional Magnetic Resonance Imaging

FOV

Field of View

ROI

Region of Interest

TE

Echo Time

TR

Repetition Time

Notes

Compliance with ethical standards

Guarantor

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.

Informed consent

Written informed consent was obtained from all subjects (patients) in this study.

Ethical approval

Institutional Review Board approval was obtained.

Methodology

• observational

• performed at one institution

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Copyright information

© European Society of Radiology 2018

Authors and Affiliations

  1. 1.Department of Radiology, Zhongda Hospital, Jiangsu Key Laboratory of Molecular and Functional ImagingZhongda Hospital, Medical School of Southeast UniversityNanjingChina

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