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HFANet: hierarchical feature fusion attention network for classification of glomerular immunofluorescence images

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Abstract

The chronic kidney disease (CKD) accompanied by permanent kidney damage, has become a heavy burden for worldwide public health. Clinically, glomerular immunofluorescence (IF) images are widely-used to reveal the occurrence probability and type of CKD. In histopathological assessment for glomerular IF image, multiple descriptive indicators are used to characterize deposits from different aspects, which suggest associated kidney lesions. In this paper, we design a hierarchical feature fusion attention network (HFANet) to classify two main descriptive indicators, namely fluorescence intensity and distribution pattern. Through the hierarchical feature fusion attention (HFA) module, HFANet supplements deep semantic features using shallow texture features to maximize its feature extraction capability and efficiency of information fusion. Different from directly adding or concatenating, HFANet weighted concatenates the feature maps from different hierarchies to highlight more discriminative regions. Further, by integrating HFANet with the proposed intensity equalization (IE) algorithm, U-Net++, and Grad-CAM, a computer-aided diagnostic system for glomerular IF images is constructed. With this system, the classification accuracy of the fluorescence intensity and distribution pattern reaches 90.48% and 90.87%, respectively. Extensive comparative experiments and ablation studies demonstrate that HFANet outperforms other universal backbones with the help of HFA module, and the classification performance of the devised system is comparable to senior pathologists. The heatmap given by the system, which is similar to the classification evidence used by the clinicians, can be used as diagnostic reference and training material for pathologists. The systematic demonstration video is available in the supplementary material.

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Funding

This work was supported in part by the National Natural Science Foundation of China under Grant Nos. 61971111, 62027803, 61601096, 61801089, and 61701095; and in part by the Department of Science and Technology of Sichuan Province, China under Grant Nos. 2020YFG0044, 2021YFG0200, 2020YFG0046, 2021YJ0144, 2019YFS0538 and 2018YSKY0017-12; and in part by the Medico-Engineering Cooperation Funds from University of Electronic Science and Technology of China under Grant No. ZYGX2021YGLH223.

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Authors and Affiliations

  1. School of Automation Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, 611731, Sichuan, China

    Haoran Liu, Yongle Xie, Xifeng Li & Dongjie Bi

  2. Department of Nephrology, Sichuan Provincial People’s Hospital, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu, 611731, Sichuan, China

    Ping Zhang, Yurong Zou, Lei Peng & Guisen Li

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  1. Haoran Liu
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Liu, H., Zhang, P., Xie, Y. et al. HFANet: hierarchical feature fusion attention network for classification of glomerular immunofluorescence images. Neural Comput & Applic 34, 22565–22581 (2022). https://doi.org/10.1007/s00521-022-07676-6

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