Wavelet transformation can enhance computed tomography texture features: a multicenter radiomics study for grade assessment of COVID-19 pulmonary lesions

Quantitative Imaging in Medicine and Surgery

article

Zekun Jiang¹  Jin Yin¹  Peilun Han¹  Nan Chen⁴  Qingbo Kang¹  Yue Qiu¹  Yiyue Li¹  Qicheng Lao¹  Miao Sun¹  Dan Yang⁷  Shan Huang⁷  Jiajun Qiu¹  Kang Li¹ 

[1] West China Biomedical Big Data Center, West China Hospital , Sichuan University;Med-X Center for Informatics , Sichuan University;West China Hospital-Sense Time Joint Laboratory;Department of Thoracic Surgery, West China Hospital , Sichuan University;Shanghai Artificial Intelligence Laboratory;College of Electrical Engineering , Sichuan University;Department of Radiology, West China Hospital , Sichuan University;Sichuan University-Pittsburgh Institute , Sichuan University

关键词: COVID-19;    computed tomography (CT);    machine learning;    quantitative image analysis;    radiomics;   

DOI  :  10.21037/qims-22-252

学科分类：外科医学

来源: AME Publications

【 摘 要 】

Background: This study set out to develop a computed tomography (CT)-based wavelet transforming radiomics approach for grading pulmonary lesions caused by COVID-19 and to validate it using real-world data. Methods: This retrospective study analyzed 111 patients with 187 pulmonary lesions from 16 hospitals; all patients had confirmed COVID-19 and underwent non-contrast chest CT. Data were divided into a training cohort (72 patients with 127 lesions from nine hospitals) and an independent test cohort (39 patients with 60 lesions from seven hospitals) according to the hospital in which the CT was performed. In all, 73 texture features were extracted from manually delineated lesion volumes, and 23 three-dimensional (3D) wavelets with eight decomposition modes were implemented to compare and validate the value of wavelet transformation for grade assessment. Finally, the optimal machine learning pipeline, valuable radiomic features, and final radiomic models were determined. The area under the receiver operating characteristic (ROC) curve (AUC), calibration curve, and decision curve were used to determine the diagnostic performance and clinical utility of the models. Results: Of the 187 lesions, 108 (57.75%) were diagnosed as mild lesions and 79 (42.25%) as moderate/severe lesions. All selected radiomic features showed significant correlations with the grade of COVID-19 pulmonary lesions (P<0.05). Biorthogonal 1.1 (bior1.1) LLL was determined as the optimal wavelet transform mode. The wavelet transforming radiomic model had an AUC of 0.910 in the test cohort, outperforming the original radiomic model (AUC =0.880; P<0.05). Decision analysis showed the radiomic model could add a net benefit at any given threshold of probability. Conclusions: Wavelet transformation can enhance CT texture features. Wavelet transforming radiomics based on CT images can be used to effectively assess the grade of pulmonary lesions caused by COVID-19, which may facilitate individualized management of patients with this disease.

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