Abstract
Purpose
To determine the correlation between intravoxel incoherent motion (IVIM) and dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) parameters.
Methods
Thirty-eight newly diagnosed NPC patients were prospectively enrolled. Diffusion-weighted images (DWI) at 13 b-values were acquired using a 3.0-T MRI system. IVIM parameters including the pure molecular diffusion (D), perfusion-related diffusion (D*), perfusion fraction (f), DCE-MRI parameters including maximum slope of increase (MSI), enhancement amplitude (EA) and enhancement ratio (ER) were calculated by two investigators independently. Intra- and interobserver agreement were evaluated using the intraclass correlation coefficient (ICC) and Bland-Altman analysis. Relationships between IVIM and DCE-MRI parameters were evaluated by calculation of Spearman’s correlation coefficient.
Results
Intra- and interobserver reproducibility were excellent to relatively good (ICC = 0.887-0.997; narrow width of 95 % limits of agreement). The highest correlation was observed between f and EA (r = 0.633, P < 0.001), with a strong correlation between f and MSI (r = 0.598, P = 0.001). No correlation was observed between f and ER (r = -0.162; P = 0.421) or D* and DCE parameters (r = 0.125–0.307; P > 0.119).
Conclusion
This study suggests IVIM perfusion imaging using 3.0-T MRI is feasible in NPC, and f correlates significantly with EA and MSI.
Key Points
• Assessment of tumour perfusion is important in nasopharyngeal carcinoma.
• DCE-MRI provided perfusion information with the use of intravenous contrast media.
• Perfusion information could be provided by non-invasive IVIM MRI.
• IVIM parameter f correlated with DCE-MRI parameters.
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Abbreviations
- CBV:
-
Cerebral blood volume
- D:
-
Pure molecular diffusion
- DCE:
-
Dynamic contrast-enhanced
- DWI:
-
Diffusion-weighted images
- D*:
-
Perfusion-related diffusion
- EA:
-
Enhancement amplitude
- ER:
-
Enhancement ratio
- f:
-
Perfusion fraction
- FOV:
-
Field of view
- IVIM:
-
Intravoxel incoherent motion
- ICC:
-
Intraclass correlation coefficient
- LoA:
-
Limits of agreement
- MRI:
-
Magnetic resonance imaging
- MSI:
-
Maximum slope of increase
- MVD:
-
Microvessel density
- MTT:
-
Mean transit time
- NEX:
-
Number of excitations
- NPC:
-
Nasopharyngeal carcinoma
- SPGR:
-
Spoiled gradient-recalled echo
- TR:
-
Repetition time
- TE:
-
Echo time
- TICs:
-
Time-signal intensity curves
- VEGFR-2:
-
Vascular endothelial growth factor receptor 2
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (nos. 81271654, 81271569 and 81171329) and Science and Technology Support Program of Guangzhou, China (2010J-E481). We gratefully acknowledge the assistance of Zhong-Ping Zhang (MD, from Applied Science Lab, GE Healthcare, Guangzhou, Guangdong Prov., P. R. China) for support with IVIM methodology and for linguistic editing.
The scientific guarantor of this publication is Chang-Hong Liang. The authors of this manuscript declare relationships with the following companies: GE Healthcare. No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Methodology: Prospective, diagnostic or prognostic study, performed at one institution.
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Qian-Jun Jia and Shui-Xing Zhang contributed equally to this manuscript.
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Jia, QJ., Zhang, SX., Chen, WB. et al. Initial experience of correlating parameters of intravoxel incoherent motion and dynamic contrast-enhanced magnetic resonance imaging at 3.0 T in nasopharyngeal carcinoma. Eur Radiol 24, 3076–3087 (2014). https://doi.org/10.1007/s00330-014-3343-2
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DOI: https://doi.org/10.1007/s00330-014-3343-2