Abstract
Objectives
To evaluate the feasibility and value of diffusion kurtosis (DK) imaging in assessing treatment response to neoadjuvant chemoradiotherapy (CRT) in patients with locally advanced rectal cancer (LARC).
Methods
Forty-one patients were included. All patients underwent pre- and post-CRT DCE-MRI on a 3.0-Tesla MRI scanner. Imaging indices (D app , K app and ADC values) were measured. Change value (∆X) and change ratio (r∆X) were calculated. Pathological tumour regression grade scores (Mandard) were the standard reference (good responders: pTRG 1-2; poor responders: pTRG 3-5). Diagnostic performance was compared using ROC analysis.
Results
For the pre-CRT measurements, pre-D app-10th was significantly lower in the good responder group than that of the poor responder group (p = 0.036). For assessing treatment response to neoadjuvant CRT, pre-D app-10th resulted in AUCs of 0.753 (p = 0.036) with a sensitivity of 66.67 % and a specificity of 77.78 %. The r∆D app had a relatively high AUC (0.859) and high sensitivity (100 %) compared with other image indices.
Conclusions
DKI is feasible for selecting good responders for neoadjuvant CRT for LARC.
Key Points
• LARC responded well after neoadjuvant chemoradiotherapy with lower pre-D app-10th .
• LARC responded well with greater increases in mean ADC and D app .
• The change ratio of D app (r∆D app ) had a relatively better diagnostic performance.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- CRT:
-
Chemoradiotherapy
- D app :
-
Apparent diffusion for Gaussian distribution
- DKI:
-
Diffusion kurtosis imaging
- K app :
-
Apparent kurtosis coefficient
- LARC:
-
Locally advanced rectal cancer
- mrTRG:
-
MRI tumour regression grade
- pTRG:
-
Pathological tumour regression grade
- ROC:
-
Receiver operating characteristic
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Acknowledgments
The scientific guarantor of this publication is Hai-Bin Shi. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was waived by the Institutional Review Board. Methodology: retrospective, observational, performed at one institution.
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Yu, J., Xu, Q., Song, JC. et al. The value of diffusion kurtosis magnetic resonance imaging for assessing treatment response of neoadjuvant chemoradiotherapy in locally advanced rectal cancer. Eur Radiol 27, 1848–1857 (2017). https://doi.org/10.1007/s00330-016-4529-6
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DOI: https://doi.org/10.1007/s00330-016-4529-6