Contrastive Learning for Prediction of Alzheimer's Disease Using Brain 18F-FDG PET

• Published in: IEEE journal of biomedical and health informatics Vol. 27; no. 4; pp. 1735 - 1746
• Main Authors: Chen, Yonglin, Wang, Huabin, Zhang, Gong, Liu, Xiao, Huang, Wei, Han, Xianjun, Li, Xuejun, Martin, Melanie, Tao, Liang
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.04.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alzheimer's disease; Alzheimer's disease (AD); Bioinformatics; Brain; brain 18F-FDG PET; Brain slice preparation; contrastive loss; Convolution; Correlation analysis; Deep learning; Diagnosis; Learning; Lesions; Medical imaging; multi-correlation analysis; multiattention mechanism; Neurodegenerative diseases; Neuroimaging; Noise prediction; Positron emission; Positron emission tomography; Signal to noise ratio; Training
• DOI: 10.1109/JBHI.2022.3231905
• ISSN: 2168-2194; 2168-2208

Brain 18F-FDG PET images are commonly-known materials for effectively predicting Alzheimer's disease (AD). However, the data volume of PET is usually insufficient, which is unfavorable to train an accurate AD prediction networks. Furthermore, the PET image is noisy with low signal-to-noise ratio, and simultaneously the feature (metabolic abnormality) used for predicting AD in PET image is not always obvious. Therefore, a contrastive-based learning method is proposed to address the challenges of PET image inherently possessed. Firstly, the slices of 3D PET image are amplified by cropping the image of anchors (i.e., an augmented version of the same image) to generate extended training data. Meanwhile, contrastive loss is adopted to enlarge inter-class feature distances and reduce intra-class feature differences using subject fuzzy labels as supervised information. Secondly, we construct a double convolutional hybrid attention module to enhance the network to learn different perceptual domains where two convolutional layers with different convolutional kernels (<inline-formula><tex-math notation="LaTeX">7\times 7</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX">5\times 5</tex-math></inline-formula>) are constructed. Moreover, we recommend a diagnosis mechanism by analyzing the consistency of predicted result for PET slices alone with clinical neuropsychological assessment to achieve a better AD diagnosis. The experimental results show that the proposed method outperforms the state-of-the-arts for brain 18F-FDG PET images, and hence demonstrate the advantage of the method in effectively predicting AD.