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Noninvasive Model For Predicting Future Ischemic Strokes In Patients With Silent Lacunar Infarction Using Radiomics

Jie-hua Su, Ling-wei Meng, D. Dong, Wen-yan Zhuo, Jian-ming Wang, Li-bin Liu, Y. Qin, Ye Tian, J. Tian, Z. Li
Published 2020 · Computer Science, Medicine

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Background This study aimed to investigate integrating radiomics with clinical factors in cranial computed tomography (CT) to predict ischemic strokes in patients with silent lacunar infarction (SLI). Methods Radiomic features were extracted from baseline cranial CT images of patients with SLI. A least absolute shrinkage and selection operator (LASSO)–Cox regression analysis was used to select significant prognostic factors based on Model C with clinical factors, Model R with radiomic features, and Model CR with both factors. The Kaplan–Meier method was used to compare stroke-free survival probabilities. A nomogram and a calibration curve were used for further evaluation. Results Radiomic signature ( p  < 0.01), age ( p  = 0.09), dyslipidemia ( p  = 0.03), and multiple infarctions ( p  = 0.02) were independently associated with future ischemic strokes. Model CR had the best accuracy with 6-, 12-, and 18-month areas under the curve of 0.84, 0.81, and 0.79 for the training cohort and 0.79, 0.88, and 0.75 for the validation cohort, respectively. Patients with a Model CR score < 0.17 had higher probabilities of stroke-free survival. The prognostic nomogram and calibration curves of the training and validation cohorts showed acceptable discrimination and calibration capabilities (concordance index [95% confidence interval]: 0.7864 [0.70–0.86]; 0.7140 [0.59–0.83], respectively). Conclusions Radiomic analysis based on baseline CT images may provide a novel approach for predicting future ischemic strokes in patients with SLI. Older patients and those with dyslipidemia or multiple infarctions are at higher risk for ischemic stroke and require close monitoring and intensive intervention.
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