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Non-Contrast CT-Based Radiomics Score for Predicting Hematoma Enlargement in Spontaneous Intracerebral Hemorrhage

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Abstract

Purpose

To develop a non-contrast computed tomography-(CT)-based radiomics score for predicting the risk of hematoma early enlargement in spontaneous intracerebral hemorrhage.

Methods

A total of 258 patients from a single-center database with acute spontaneous intracerebral parenchymal hemorrhage were collected. Radiomics software was explored to segment hematomas on baseline non-contrast CT images, and the texture features were extracted. Minimal Redundancy and Maximal Relevance (mRMR) and Least Absolute Shrinkage and Selection Operator (LASSO), were used to select optimized subset of features and radiomics score was calculated. The radiomics model (radiomics score-based), radiomics nomogram (radiomics score combined with clinical factors-based) and clinical model (clinical factors-based) were built in a training cohort and validated in a test cohort. The discrimination, calibration, and clinical usefulness of the models were evaluated. Finally, a subgroup analysis was performed to assess the predictive value of radiomics score in specific hemorrhage location.

Results

Radiomics score was composed of 12 radiomics features. The radiomics model and radiomics nomogram both showed good performance in predicting hematoma enlargement (area under the curve, AUC 0.83 [0.71–0.95], AUC 0.82 [0.72, 0.93]), and were both better than clinical model (AUC 0.66 [0.54–0.79]). The radiomics model and radiomics nomogram showed satisfactory calibration and clinical usefulness for detecting hematoma enlargement. For subgroup analysis, radiomics score also showed good predictive value for hematoma enlargement in different locations (AUC were 0.828, 0.940, 0.836 and 0.904, respectively, for supratentorial, subtentorial, deep and lobes).

Conclusion

A radiomics score based on non-contrast CT may be considered as a potential biomarker for prediction of hematoma enlargement in patients with spontaneous intracerebral hemorrhage (SICH), and it presented a high incremental value to clinical factors for hematoma enlargement prediction.

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Xiang Wang.

Ethics declarations

Conflict of interest

H. Li, Y. Xie, H. Liu and X. Wang declare that they have no competing interests.

Ethical standards

For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case. The study was approved by the local medical ethics committee of Wuhan Central Hospital (NO.[2021]013). This study was a retrospective research and the informed consent was waived.

Funding

This work was supported by a fund from Wuhan Municipal Health Commission (WX21B15).

Additional information

Hui Li and Yuanliang Xie contributed equally to this work.

Appendix

Appendix

Appendix A1: The Process of Building Radiomics Score Formula

The baseline brain NCCT images of all cases were exported from picture archiving and communication system (PACS) with a uniform window position of 35 HU and a window width of 90 HU and imported into the radiomics software. Each hematoma on the image was segmented layer by layer by semi-automatic segmentation method to obtain a three-dimensional volume of interest (VOI) of hematoma, and texture features of three-dimensional VOI calculated by software were saved.

Two feature selection methods, mRMR and LASSO were used to select features. At first, mRMR was performed to eliminate the redundant and irrelevant features, 30 features were retained. Then the LASSO algorithm was used to choose the regular parameter λ and determine the number of the feature, the 10-fold cross-validation was adopted to avoid overfitting. The most predictive subset of feature was chosen, and the corresponding coefficients were evaluated. Radiomics score formula was generated using the selected features according to the formula as follows: radiomics score = (∑βi * Xi) + Intercept (i = 0, 1, 2, 3 …) Where Xi represented the ith selected feature and βi was its coefficient.

Appendix A2: The Process of Models Construction, Calibration and Validation

All patients were randomly divided into training cohort and test cohort according to the ratio of 7:3, models were established in the training cohort and then validated by test cohort. Three models were established: radiomics model (radiomics score-based), clinical model (clinical factors-based) and radiomics nomogram (radiomics score combined with clinical factors-based).

Model Construction

Radiomics Model

HE or non-HE was used as dichotomy criterion, The predictive model based on radiomics scores was built in training cohort using the following univariate logistic regression equations: logit πradiomics score = 0.457 + 1.537 × radiomics score.

Clinical Model

For clinical factors, we adopted univariate and multivariate logistic regression analysis to screen independent risk factors. Then, multivariate logistic regression model based on independent clinical risk factors was constructed in training cohort.

Radiomics Nomogram

Based on radiomics score and independent clinical risk factors, we established a radiomics nomogram to predict HE in training cohort.

Models Calibration

Discrimination

The ROC curves were plotted and the AUCs under ROCs were used to evaluate the performances of radiomics model, clinical model and radiomics nomogram in discriminating patients with HE from those with non-HE in training cohort.

Calibration

Hosmer-Lemeshow test was performed to test the calibration and decision curve analysis (DCA) to evaluate the clinical net benefit of the models in training cohort.

Model Validation

Radiomics model, clinical model and radiomics nomogram established in training cohort were introduced into test cohort to validate and the same process as training cohort of performances assessment with the ROC analysis and the calibration curve were also carried out in test cohort.

Appendix A3: The Radiomics Score Formula

$$\text{Radscore}=-0.076*\text{wavelet-LLH\textunderscore glszm\textunderscore LargeAreaHighGrayLevel Emphasis} +0.138*\text{wavelet-HHH\textunderscore firstorder\textunderscore TotalEnergy} +0.015*w\text{avelet-LHH\textunderscore glrlm\textunderscore LongRunLowGrayLevelEmphasis} +0.183*\text{log-sigma-3-0-mm-3D\textunderscore firstorder\textunderscore 10Percentile} +-0.302*\text{log-sigma-2-0-mm-3D\textunderscore glrlm\textunderscore RunLengthNonUniformityNormalized} +-0.248*\text{wavelet-LHL \textunderscore gldm\textunderscore SmallDependenceEmphasis} +0.07*\text{log-sigma-2-0-mm-3D\textunderscore firstorder\textunderscore Kurtosis} +0.213*\text{wavelet-LLH\textunderscore glszm\textunderscore GrayLevelNon Uniformity} +0.189*\text{log-sigma-3-0-mm-3D\textunderscore glszm\textunderscore LargeAreaLowGrayLevelEmphasis} +-0.082*\text{wavelet-LLL\textunderscore glrlm\textunderscore ShortRunEmphasis} +0.051*\text{wavelet-HLL\textunderscore glszm\textunderscore LargeAreaHighGrayLevelEmphasis} +-0.394*\text{wavelet-LLL\textunderscore ngtdm\textunderscore Contrast} +-1.386$$

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Li, H., Xie, Y., Liu, H. et al. Non-Contrast CT-Based Radiomics Score for Predicting Hematoma Enlargement in Spontaneous Intracerebral Hemorrhage. Clin Neuroradiol 32, 517–528 (2022). https://doi.org/10.1007/s00062-021-01062-w

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