Analysis of ultrasonic guided waves propagating in long bones and cortical thickness based on time-frequency methods |
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| Authors: | LUO Chungou TA De'an LI Wei WANG Weiqi |
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| Institution: | LUO Chungou TA De'an LI Wei WANG Weiqi (Department of Electronic Engineering,Fudan University Shanghai 200433) |
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| Abstract: | The ultrasonic signals in long bones contain multiple guided modes which are mutual superposed.The velocities of guided waves in long bones are very sensitive to cortical thickness (CTh).In this paper,Hilbert-Huang transform(HHT) was proposed to analyze multi-mode guided waves,which can decompose superposed waves into many independent modes.Then the group velocity of each mode was obtained at corresponding frequency,which was compared with the results of short time Fourier transform(STFT).The CTh was also o... |
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