Functional Evaluation of Transplanted Kidneys with Reduced Field-of-View Diffusion-Weighted Imaging at 3T.
10.3348/kjr.2018.19.2.201
- Author:
Yuan XIE
1
;
Yanjun LI
;
Jiqiu WEN
;
Xue LI
;
Zhe ZHANG
;
Jianrui LI
;
Yan'e ZHAO
;
Peng WANG
;
Jun ZHANG
;
Ying TIAN
;
Long Jiang ZHANG
;
Guang Ming LU
Author Information
1. Department of Medical Imaging, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China. kevinzhlj@163.com
- Publication Type:Original Article
- Keywords:
Diffusion-weighted imaging;
Kidney allografts;
Transplantation;
Reduced field-of-view;
MRI;
3T
- MeSH:
Diffusion;
Glomerular Filtration Rate;
Healthy Volunteers;
Humans;
Kidney Transplantation;
Kidney*;
Magnetic Resonance Imaging;
Perfusion;
Sensitivity and Specificity;
Transplantation;
Volunteers
- From:Korean Journal of Radiology
2018;19(2):201-208
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: To determine the feasibility of reduced field-of-view diffusion-weighted imaging (rFOV DWI) with multi-b values to detect functional variability in transplanted kidneys. MATERIALS AND METHODS: Using a 3T MRI scanner, multi-b rFOV DWI of transplanted kidney or native kidney was performed in 40 renal transplantation recipients and 18 healthy volunteers. The patients were stratified, according to an estimated glomerular filtration rate (eGFR): Group 1, eGFR ≥ 60 mL/min/1.73 m2; Group 2, eGFR ≥ 30 mL/min/1.73 m2 and < 60 mL/min/1.73 m2; Group 3, eGFR < 30 mL/min/1.73 m2. Total apparent diffusion coefficient (ADCT), perfusion-free ADC (ADCD) and perfusion fraction (FP) of kidneys were calculated and compared among the four groups. Correlations between the imaging results and eGFR were assessed. RESULTS: All volunteers had eGFR ≥ 60 mL/min/1.73 m2, while 16, 16, and 8 patients were included in Groups 1, 2, and 3, respectively. In the renal cortex, ADCT was higher in Group 1 ([1.65 ± 0.13] × 10−3 mm2/s) than Group 3 ([1.44 ± 0.11] × 10−3 mm2/s) (p < 0.05), and the inter-group differences of FP values were significant (all p < 0.05) (0.330 ± 0.024, 0.309 ± 0.019, 0.278 ± 0.033, and 0.250 ± 0.028 for control group, Groups 1, 2, and 3, respectively). Renal cortical ADCT, ADCD, FP, and renal medullary ADCT and FP correlated positively with eGFR (r = 0.596, 0.403, 0.711, 0.341, and 0.323, respectively; all p < 0.05). When using 0.278 as the cutoff value, renal cortical FP had a sensitivity of 97.1% and a specificity of 66.7% for predicting decreased renal function. CONCLUSION: Multi-b rFOV DWI presents transplanted kidneys with high resolution, which is a promising functional tool for non-invasively monitoring function of transplanted kidneys.
