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Abstract #2462

A New, Simple Two-Pass Masking Approach for Streaking Artifact Removal in Any QSM Pipeline

Anita Karsa1 and Karin Shmueli1
1Medical Physics and Biomedical Engineering, University College London, London, United Kingdom


Tissue magnetic susceptibility maps calculated using any Quantitative Susceptibility Mapping (QSM) pipeline are often corrupted by streaking artifacts. Large streaking artifacts originating from extreme-susceptibility regions, such as interhemispheric calcifications or intracerebral bleeds, are common, not only in patients, but also in healthy, elderly subjects. Several variations on the two-pass masking approach have been proposed previously to suppress these artifacts. Here we propose a broadly-applicable two-pass masking method that is easy to implement and integrate into any QSM pipeline. We show that two-pass masking greatly reduces streaking from calcifications and cerebral bleeds without affecting susceptibility map anatomical features and values.

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