Abstract
Background
Diffusion kurtosis imaging (DKI) is a technique based on the theory that the diffusion of water follows non-Gaussian distribution; until now, few studies have explored the usefulness of DKI in differentiating parotid gland tumors.
Purpose
To evaluate the potential of DKI in the characterization of parotid gland tumors.
Material and Methods
DKI was performed in 40 patients with parotid gland tumors (33 benign, 7 malignant). DKI parameters including apparent diffusion coefficient (Dapp) and apparent kurtosis coefficient (Kapp) were obtained using the DK model and compared. Intraclass correlation coefficient (ICC) was used to evaluate inter-observer agreement of DKI derived parameters.
Results
Excellent inter-observer agreements (Dapp, ICC = 0.988; Kapp, ICC = 0.985) were achieved during quantitative measurements. There were no significant differences in Dapp (P = 0.055) and Kapp (P = 0.915) between the benign and malignant groups. In the subgroup analyses, pleomorphic adenomas showed higher Dapp (P < 0.001) and lower Kapp (P = 0.037) than malignant tumors. Combination of Dapp and Kapp showed optimal discriminative value (area under curve [AUC] = 0.913; sensitivity = 88.89%; specificity = 85.71%). Pleomorphic adenomas also showed higher Dapp (P < 0.001) and lower Kapp (P < 0.001) than Warthin’s tumors. A combination of Dapp and Kapp showed optimal discriminative value (AUC = 1.000; sensitivity = 100%; specificity = 100%). Warthin’s tumors demonstrated higher Kapp than malignant tumors (P < 0.001), while no significant difference was found on Dapp (P = 0.448). The AUC, sensitivity, and specificity of Kapp for discriminating Warthin’s tumors from malignant tumors at an optimal threshold of 0.735 were 0.905, 88.89%, and 85.71%, respectively.
Conclusion
DKI may be a promising imaging technique for characterizing parotid gland tumors.
Keywords
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