Wigner-Ville distribution and Gabor transform in Doppler ultrasound signal processing.
Time-frequency distributions have been used extensively for nonstationary signal analysis, they describe how the frequency content of a signal is changing in time. The Wigner-Ville distribution (WVD) is the best known. The draw back of WVD is cross-term artifacts. An alternative to the WVD is Gabor transform (GT), a signal decomposition method, which displays the time-frequency energy of a signal on a joint t-f plane without generating considerable cross-terms. In this paper the WVD and GT of ultrasound echo signals are computed analytically.
Electrical Engineering Department, Iran University of Science & Technology, Islamic Azad University, Tehran South Unit, Tehran, Iran. s_ghofrani@iust.ac.ir
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Ghofrani
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Ayatollahi
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Shamsollahi
D000465:Algorithms; D016477:Artifacts; D005583:Fourier Analysis; D007089:Image Enhancement / Q000379:methods; D008954:Models, Biological; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013269:Stochastic Processes; D014463:Ultrasonography / Q000379:methods*