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  • Wiley  (2)
  • Hermier, Marc  (2)
  • Biodiversity Research  (2)
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  • Wiley  (2)
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  • Biodiversity Research  (2)
  • 1
    In: European Journal of Neuroscience, Wiley, Vol. 50, No. 8 ( 2019-10), p. 3251-3260
    Abstract: Recent imaging developments have shown the potential of voxel‐based models in assessing infarct growth after stroke. Many models have been proposed but their relevance in predicting the benefit of a reperfusion therapy remains unclear. We searched for a predictive model whose volumetric predictions would identify stroke patients who are to benefit from tissue plasminogen activator (t‐ PA )‐induced reperfusion. Material and Methods Forty‐five cases were used to study retrospectively stroke progression from admission to end of follow‐up. Predictive approaches based on various statistical models, predictive variables and spatial filtering methods were compared. The optimal approach was chosen according to the area under the precision‐recall curve ( AUPRC ). The final lesion volume was then predicted assuming that the patient would or would not reperfuse. Patients, with an acute lesion of ≤50 ml and a predicted reduction in the presence of reperfusion 〉 6 ml and 〉 25% of the acute lesion, were classified as responders. Results The optimal model was a logistic regression using the voxel distance to the acute lesion, the volume of the acute lesion and Gaussian‐filtered MRI contrast parameters as predictive variables. The predictions gave a median AUPRC of 0.655, a median AUC of 0.976 and a median volumetric error of 8.29 ml. Nineteen patients matched the responder profile. A non‐significant trend of improved reduction in NIHSS score (−42.8%, p  = .09) and in lesion volume (−78.1%, p  = 0.21) following reperfusion was observed for responder patients. Conclusion Despite limited volumetric accuracy, predictive stroke models can be used to quantify the benefit of reperfusion therapies.
    Type of Medium: Online Resource
    ISSN: 0953-816X , 1460-9568
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2005178-5
    SSG: 12
    Location Call Number Limitation Availability
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  • 2
    In: European Journal of Neuroscience, Wiley, Vol. 50, No. 10 ( 2019-11), p. 3590-3598
    Abstract: In acute ischaemic stroke, identifying brain tissue at high risk of infarction is important for clinical decision‐making. This tissue may be identified with suitable classification methods from magnetic resonance imaging data. The aim of the present study was to assess and compare the performance of five popular classification methods (adaptive boosting, logistic regression, artificial neural networks, random forest and support vector machine) in identifying tissue at high risk of infarction on human voxel‐based brain imaging data. The classification methods were used with eight MRI parameters, including diffusion‐weighted imaging and perfusion‐weighted imaging obtained in 55 patients. The five criteria used to assess the performance of the methods were the area under the receiver operating curve (AUC roc ), the area under the precision–recall curve (AUC pr ), sensitivity, specificity and the Dice coefficient. The methods performed equally in terms of sensitivity and specificity, while the results of AUC roc and the Dice coefficient were significantly better for adaptive boosting, logistic regression, artificial neural networks and random forest. However, there was no statistically significant difference between the performances of these five classification methods regarding AUC pr , which was the main comparison metric. Machine learning methods can provide valuable prognostic information using multimodal imaging data in acute ischaemic stroke, which in turn can assist in developing personalized treatment decision for clinicians after a thorough validation of methods with an independent data set.
    Type of Medium: Online Resource
    ISSN: 0953-816X , 1460-9568
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2005178-5
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
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