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• W3049636721 abstract "Objective: The segmentation of the breast from the chest wall is an important first step in the analysis of breast magnetic resonance images. 3D U-Nets have been shown to obtain high segmentation accuracy and appear to generalize well when trained on one scanner type and tested on another scanner, provided that a very similar MR protocol is used. There has, however, been little work addressing the problem of domain adaptation when image intensities or patient orientation differ markedly between the training set and an unseen test set. In this work we aim to address this domain shift problem. Method: We propose to apply extensive intensity augmentation in addition to geometric augmentation during training. We explored both style transfer and a novel intensity remapping approach as intensity augmentation strategies. For our experiments, we trained a 3D U-Net on T1-weighted scans. We tested our network on T2-weighted scans from the same dataset as well as on an additional independent test set acquired with a T1-weighted TWIST sequence and a different coil configuration. Results: By applying intensity augmentation we increased segmentation performance for the T2-weighted scans from a Dice of 0.71 to 0.88. This performance is very close to the baseline performance of training with T2-weighted scans (0.92). On the T1-weighted dataset we obtained a performance increase from 0.77 to 0.85. Conclusion: Our results show that the proposed intensity augmentation increases segmentation performance across different datasets. Significance: The proposed method can improve whole breast segmentation of clinical MR scans acquired with different protocols." @default.
• W3049636721 created "2020-08-21" @default.
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• W3049636721 date "2021-03-01" @default.
• W3049636721 modified "2023-10-06" @default.
• W3049636721 title "Intensity Augmentation to Improve Generalizability of Breast Segmentation Across Different MRI Scan Protocols" @default.
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• W3049636721 doi "https://doi.org/10.1109/tbme.2020.3016602" @default.
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