Abstract
Objectives
To evaluate the value of ZOOMit diffusion kurtosis imaging (DKI) and chemical exchange saturation transfer (CEST) imaging in predicting WHO/ISUP grade and pathological T stage in clear cell renal cell carcinoma (ccRCC).
Methods
Forty-six patients with ccRCC were included in this retrospective study. All participants underwent MRI including ZOOMit DKI and CEST. The non-Gaussian mean kurtosis (MK), mean diffusivity (MD), magnetization transfer ratio asymmetry (MTRasym (3.5 ppm)), and Ssat (3.5 ppm)/S0 were analyzed based on different WHO/ISUP grades and pT stages. Binary logistic regression was used to identify the best combination of the parameters. Pearson’s correlation coefficients were calculated between CEST and diffusion-related parameters.
Results
The ADC, MD, and Ssat (3.5 ppm)/S0 values were significantly lower for higher WHO/ISUP grade tumors, whereas the MK and MTRasym (3.5 ppm) were higher in higher WHO/ISUP grade and higher pT stage tumors. MTRasym (3.5 ppm) combined with MD (AUC, 0.930; 95% CI, 0.858–1.000) showed the best diagnostic efficacy in evaluating the WHO/ISUP grade. MTRasym (3.5 ppm) and MK were mildly positively correlated (r = 0.324, p = 0.028). Ssat (3.5 ppm)/S0 was moderately positively correlated with ADC (r = 0.580, p < 0.001), mildly positively correlated with MD (r = 0.412, p = 0.005), and moderately negatively correlated with MK (r = −0.575, p < .001).
Conclusion
The microstructural and biochemical assessment of ZOOMit DKI and CEST allowed for the characterization of different WHO/ISUP grades and pT stages in ccRCC. MTRasym (3.5 ppm) combined with MD showed the best diagnostic performance for WHO/ISUP grading.
Key Points
• Both diffusion kurtosis imaging (DKI) and chemical exchange saturation transfer (CEST) can be used to predict the WHO/ISUP grade and pathological T stage.
• MTRasym (3.5 ppm) combined with MD showed the highest AUC (0.930; 95% CI, 0.858–1.000) in WHO/ISUP grading.
• MTRasym at 3.5 ppm showed a positive correlation with mean kurtosis.
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Abbreviations
- APT:
-
Amide proton transfer
- CEST:
-
Chemical exchange saturation transfer
- DKI:
-
Diffusion kurtosis imaging
- DWI:
-
Diffusion-weighted imaging
- ICC:
-
Intraclass correlation coefficient
- MTRasym (3.5 ppm):
-
Asymmetric magnetization transfer ratio at 3.5 ppm
- ROC:
-
Receiver operating characteristic
- ROI:
-
Region-of-interest
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Acknowledgements
This retrospective study was approved by the Ethics Committee of Tongji Hospital of Huazhong University of Science and Technology. Requirement for informed consent was waived.
Funding
This study has received funding by the National Natural Science Foundation of China (No. 82071889 and 81971605).
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The scientific guarantor of this publication is Zhen Li (Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology).
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Li, S., He, K., Yuan, G. et al. WHO/ISUP grade and pathological T stage of clear cell renal cell carcinoma: value of ZOOMit diffusion kurtosis imaging and chemical exchange saturation transfer imaging. Eur Radiol 33, 4429–4439 (2023). https://doi.org/10.1007/s00330-022-09312-2
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DOI: https://doi.org/10.1007/s00330-022-09312-2