Search Results for author: Perminder S. Sachdev

Found 6 papers, 0 papers with code

Sex Differences in 6-Year Progression of White Matter Hyperintensities in Non-Demented Older Adults: Sydney Memory and Ageing Study

no code implementations17 Jul 2023 Abdullah Alqarni, Wei Wen, Ben C. P. Lam, Nicole Kochan, Henry Brodaty, Perminder S. Sachdev, Jiyang Jiang

Conclusion: The findings highlighted sex differences in the associations between WMH progression and cognition decline over time, suggesting sex-specific strategies in managing WMH accumulations in ageing.

Temporal Pattern Mining for Analysis of Longitudinal Clinical Data: Identifying Risk Factors for Alzheimer's Disease

no code implementations11 Sep 2022 Annette Spooner, Gelareh Mohammadi, Perminder S. Sachdev, Henry Brodaty, Arcot Sowmya

This method uses temporal abstraction to convert the data into a more appropriate form for modelling, temporal pattern mining, to discover patterns in the complex, longitudinal data and machine learning models of survival analysis to select the discovered patterns.

Survival Analysis

Ensemble feature selection with clustering for analysis of high-dimensional, correlated clinical data in the search for Alzheimer's disease biomarkers

no code implementations6 Jul 2022 Annette Spooner, Gelareh Mohammadi, Perminder S. Sachdev, Henry Brodaty, Arcot Sowmya

When feature selection is applied to these datasets to identify the most important features, the biases inherent in some multivariate feature selectors due to correlated features make it difficult for these methods to distinguish between the important and irrelevant features and the results of the feature selection process can be unstable.

Clustering feature selection

Ensemble feature selection with data-driven thresholding for Alzheimer's disease biomarker discovery

no code implementations5 Jul 2022 Annette Spooner, Gelareh Mohammadi, Perminder S. Sachdev, Henry Brodaty, Arcot Sowmya

A fixed threshold, which is typically applied, offers no guarantee that the final set of selected features contains only relevant features.

feature selection

Hormonal Factors Moderate the Associations Between Vascular Risk Factors and White Matter Hyperintensities

no code implementations12 May 2022 Abdullah Alqarni, Wei Wen, Ben C. P. Lam, John D. Crawford, Perminder S. Sachdev, Jiyang Jiang

Generalised linear models were applied to examine 1) the main effects of vascular (body mass index, hip to waist ratio, pulse wave velocity, hypercholesterolemia, diabetes, hypertension, smoking status) and hormonal (testosterone levels, contraceptive pill, hormone replacement therapy, menopause) factors on WMH, and 2) the moderation effects of hormonal factors on the relationship between vascular risk factors and WMH volumes.

Management

Computer-Aided Extraction of Select MRI Markers of Cerebral Small Vessel Disease: A Systematic Review

no code implementations4 Apr 2022 Jiyang Jiang, Dadong Wang, Yang song, Perminder S. Sachdev, Wei Wen

Cerebral small vessel disease (CSVD) is a major vascular contributor to cognitive impairment in ageing, including dementias.

Transfer Learning

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