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Image harmonization: A review of statistical and deep learning methods for removing batch effects and evaluation metrics for effective harmonization
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Image harmonization: A review of statistical and deep learning methods for removing batch effects and evaluation metrics for effective harmonization
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Journal Article
Image harmonization: A review of statistical and deep learning methods for removing batch effects and evaluation metrics for effective harmonization
2023
Overview
•Batch effects introduce significant confounding in multi-batch neuroimaging data.•Removal of batch effects is critical for reproducibility and generalizability.•We review current harmonization methods and describe common evaluation metrics.•We provide guidance to end-users on choosing an appropriate harmonization method.•We provide guidance to methodologists on current limitations and future directions.
Magnetic resonance imaging and computed tomography from multiple batches (e.g. sites, scanners, datasets, etc.) are increasingly used alongside complex downstream analyses to obtain new insights into the human brain. However, significant confounding due to batch-related technical variation, called batch effects, is present in this data; direct application of downstream analyses to the data may lead to biased results. Image harmonization methods seek to remove these batch effects and enable increased generalizability and reproducibility of downstream results. In this review, we describe and categorize current approaches in statistical and deep learning harmonization methods. We also describe current evaluation metrics used to assess harmonization methods and provide a standardized framework to evaluate newly-proposed methods for effective harmonization and preservation of biological information. Finally, we provide recommendations to end-users to advocate for more effective use of current methods and to methodologists to direct future efforts and accelerate development of the field.
Publisher
Elsevier Inc,Elsevier Limited,Elsevier
Subject
