Abstract | BACKGROUND: Dual-energy computed tomography, diffusion-weighted imaging (DWI), and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) can be used to distinguish microinvasion areas of malignant bone tumors. However, reports of diffusion kurtosis imaging (DKI) to determine the extent of intramedullary infiltration are relatively rare. PURPOSE: To assess the application value of MR-DKI in differentiating areas of microinfiltration and simple edema in rabbit bone VX2 tumor models. MATERIAL AND METHODS: Conventional MRI and DKI were performed on 25 successfully constructed rabbit VX2 bone tumor models. We acquired a midline sagittal section of the tumor for hematoxylin and eosin staining. Using pathological findings as the gold standard and combining them with MRI data, strict point-to-point control was performed to delineate regions of interest (ROIs) in the microinfiltration and simple- edema areas of bone tumors for quantitative measurement of mean diffusivity (MD) and mean kurtosis (MK). MD and MK values between microinfiltration and simple- edema areas were compared using an independent sample t-test, and the diagnostic values were evaluated by receiver operating characteristic (ROC) curve analysis. RESULTS: In comparison with the simple- edema area, the micro-infiltration area demonstrated significantly smaller MD values and larger MK values (P < 0.05), and MD showed a better area under the curve (AUC) than MK (AUC = 0.884 vs. AUC = 0.690) for distinguishing the microinfiltration area from the simple- edema area. The optimal cutoff MD value was 1108.5 mm2/s with a sensitivity of 84% and specificity of 84%. CONCLUSION: DKI can distinguish the microinfiltration and simple- edema areas of malignant bone tumors in animal experiments.
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Authors | Fang Yajun, Tang Limin, Zhou Ruizhi, Xu Qi, Chen Haisong |
Journal | Acta radiologica (Stockholm, Sweden : 1987)
(Acta Radiol)
Vol. 63
Issue 6
Pg. 794-801
(Jun 2022)
ISSN: 1600-0455 [Electronic] England |
PMID | 34000825
(Publication Type: Journal Article)
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Topics |
- Animals
- Bone Neoplasms
(diagnostic imaging)
- Diffusion Magnetic Resonance Imaging
(methods)
- Diffusion Tensor Imaging
(methods)
- Edema
- Humans
- Rabbits
- Sensitivity and Specificity
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