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1- Mashhad Branch, Islamic Azad University, Mashhad, Iran.
Abstract:
Introduction: Neurodegenerative diseases (NDD) present substantial challenges due to their impact on movement, emphasizing the critical role of biomedical engineering research in clinical diagnosis. Measuring the biomechanical properties of gait during walking can provide valuable insights into the movement pattern of NDDs and has great promise for developing non-invasive automated NDD classification techniques.
Methods: Based on the GaitNDD database, two experimental trials were conducted on healthy controls and three NDDs: Parkinson’s disease, amyotrophic lateral sclerosis, and Huntington’s disease, showcasing a comprehensive analysis of one-dimensional and two-dimensional force gait features. In the first trial, two time-frequency feature sequences are extracted from right, left, and combined feet during a walking task, feeding a bidirectional long short-term memory (BiLSTM) network. The second trial involves constructing spectrogram images of the gait signal as input for three popular pre-trained convolutional neural networks (CNNs): AlexNet, GoogLeNet, and VGG16.
Results: VGG16 emerges as the standout performer, achieving a remarkable accuracy of 99.91%, sensitivity of 99.93%, and specificity of 99.97% for automatic four-class NDD detection using high-level features from the right foot gait signal. Notably, BiLSTM performance significantly improves when fed with VGG16-extracted high-level features, surpassing hand-crafted features.
Conclusion: The study underscores the superiority of CNNs, particularly VGG16, in extracting high-level features from spectrogram-derived vertical ground reaction force (vGRF) signals for robust NDD classification. The hybrid VGG16-BiLSTM approach demonstrates enhanced performance, affirming the synergistic benefits of combining deep learning techniques. Overall, the CNN high-level features derived from vGRF signal spectrograms provide valuable insights into NDD groups, offering a promising avenue for understanding diverse mechanisms underlying gait-related conditions.
Methods: Based on the GaitNDD database, two experimental trials were conducted on healthy controls and three NDDs: Parkinson’s disease, amyotrophic lateral sclerosis, and Huntington’s disease, showcasing a comprehensive analysis of one-dimensional and two-dimensional force gait features. In the first trial, two time-frequency feature sequences are extracted from right, left, and combined feet during a walking task, feeding a bidirectional long short-term memory (BiLSTM) network. The second trial involves constructing spectrogram images of the gait signal as input for three popular pre-trained convolutional neural networks (CNNs): AlexNet, GoogLeNet, and VGG16.
Results: VGG16 emerges as the standout performer, achieving a remarkable accuracy of 99.91%, sensitivity of 99.93%, and specificity of 99.97% for automatic four-class NDD detection using high-level features from the right foot gait signal. Notably, BiLSTM performance significantly improves when fed with VGG16-extracted high-level features, surpassing hand-crafted features.
Conclusion: The study underscores the superiority of CNNs, particularly VGG16, in extracting high-level features from spectrogram-derived vertical ground reaction force (vGRF) signals for robust NDD classification. The hybrid VGG16-BiLSTM approach demonstrates enhanced performance, affirming the synergistic benefits of combining deep learning techniques. Overall, the CNN high-level features derived from vGRF signal spectrograms provide valuable insights into NDD groups, offering a promising avenue for understanding diverse mechanisms underlying gait-related conditions.
Keywords: Neurodegenerative disease, Gait analysis, Spectrogram, Time-frequency features, Short-time Fourier transform
Type of Study: Original |
Subject:
Computational Neuroscience
Received: 2023/12/21 | Accepted: 2024/09/9
Received: 2023/12/21 | Accepted: 2024/09/9
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