期刊
MAGNETIC RESONANCE IMAGING
卷 61, 期 -, 页码 33-40出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.mri.2019.05.003
关键词
Locally advanced rectal cancer; Neoadjuvant chemoradiation therapy; Radiomics; Convolutional neural network; Multi-parametric MRI
资金
- NIH [R01 CA127927]
- Rutgers Cancer Institute of New Jersey [P30 CA072720]
- National Natural Science Foundation of China [81441086, 81672976]
- Natural Science Foundation of Zhejiang Province [LY14H160016]
- Basic Public Welfare Research Program of Zhejiang Province [LGD19H160005]
Purpose: To predict the neoadjuvant chemoradiation therapy (CRT) response in patients with locally advanced rectal cancer (LARC) using radiomics and deep learning based on pre-treatment MRI and a mid-radiation followup MRI taken 3-4 weeks after the start of CRT. Methods: A total of 51 patients were included, 45 with pre-treatment, 41 with mid-radiation therapy (RT), and 35 with both MRI sets. The multi-parametric MRI protocol included T2, diffusion weighted imaging (DWI) with b-values of 0 and 800 s/mm(2), and dynamic-contrast-enhanced (DCE) MRI. After completing CRT and surgery, the specimen was examined to determine the pathological response based on the tumor regression grade. The tumor ROI was manually drawn on the post-contrast image and mapped to other sequences. The total tumor volume and mean apparent diffusion coefficient (ADC) were measured. Radiomics using GLCM texture and histogram parameters, and deep learning using a convolutional neural network (CNN), were performed to differentiate pathologic complete response (pCR) vs. non-pCR, and good response (GR) vs. non-GR. Results: Tumor volume decreased and ADC increased significantly in the mid-RT MRI compared to the pretreatment MRI. For predicting pCR vs. non-pCR, combining ROI and radiomics features achieved an AUC of 0.80 for pre-treatment, 0.82 for mid-RT, and 0.86 for both MRI together. For predicting GR vs. non-GR, the AUC was 0.91 for pre-treatment, 0.92 for mid-RT, and 0.93 for both MRI together. In deep learning using CNN, combining pre-treatment and mid-RT MRI achieved a higher accuracy compared to using either dataset alone, with AUC of 0.83 for predicting pCR vs. non-pCR. Conclusion: Radiomics based on pre-treatment and early follow-up multi-parametric MRI in LARC patients receiving CRT could extract comprehensive quantitative information to predict final pathologic response.
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