Abstract
Purpose
The current study aimed to evaluate the association of endorectal ultrasound (EUS) radiomics features at different denoising filters based on machine learning algorithms and to predict radiotherapy response in locally advanced rectal cancer (LARC) patients.
Methods
The EUS images of forty-three LARC patients, as a predictive biomarker for predicting the treatment response of neoadjuvant chemoradiotherapy (NCRT), were investigated. For despeckling, the EUS images were preprocessed by traditional filters (bilateral, wiener, lee, frost, median, and wavelet filters). The rectal tumors were delineated by two readers separately, and radiomics features were extracted. The least absolute shrinkage and selection operator were used for feature selection. Classifiers including logistic regression (LR), K-nearest neighbor (KNN), support vector machine (SVM), random forest, naive Bayes, and decision tree were trained using stratified fivefold cross-validation for model development. The area under the curve (AUC) of the receiver operating characteristic curve followed by accuracy, precision, sensitivity, and specificity were obtained for model performance assessment.
Results
The wavelet filter had the best results with means of AUC: 0.83, accuracy: 77.41%, precision: 82.15%, and sensitivity: 79.41%. LR and SVM by having AUC: 0.71 and 0.76; accuracy: 70.0% and 71.5%; precision: 75.0% and 73.0%; sensitivity: 69.8% and 80.2%; and specificity: 70.0% and 60.9% had the highest model’s performance, respectively.
Conclusion
This study demonstrated that the EUS-based radiomics model could serve as pretreatment biomarkers in predicting pathologic features of rectal cancer. The wavelet filter and machine learning methods (LR and SVM) had good results on the EUS images of rectal cancer.
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Acknowledgements
This study was extracted from a Ph.D. thesis from the first author approved by the Tehran University of Medical Sciences. The authors would like to thank the staff of the Medical Imaging and Radiotherapy Oncology centers in Firouzgar Hospital of Iran University of Medical Sciences (Tehran, Iran).
Funding
This work was supported by the Tehran University of Medical Sciences, under Grant No. 49134.
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SA, HAb, and MA contributed to conceptualization, SA, HAb, and SRM contributed to methodology, SA, HAb, HAr, and SRM contributed to formal analysis and investigation, SA contributed to writing and preparation of the original draft, HAb, HAr, MB, AMA, PF, MA, and SRM contributed to writing, reviewing, and editing of the manuscript, SA, MA, and SRM contributed to funding acquisition, AMA and PF provided resources, MA, SRM, and HAr performed supervision.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Tehran University of Medical Sciences (No. IR.TUMS.MEDICINE.REC.1399.244).
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Abbaspour, S., Abdollahi, H., Arabalibeik, H. et al. Endorectal ultrasound radiomics in locally advanced rectal cancer patients: despeckling and radiotherapy response prediction using machine learning. Abdom Radiol 47, 3645–3659 (2022). https://doi.org/10.1007/s00261-022-03625-y
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DOI: https://doi.org/10.1007/s00261-022-03625-y