Title :
Extraction of spectrally overlapped second harmonic using the fractional Fourier transform
Author :
Harput, Sevan ; Arif, Muhammad ; McLaughlan, James ; Smith, Peter ; Cowell, David M. J. ; Freear, Steven
Author_Institution :
Sch. of Electron. & Electr. Eng., Univ. of Leeds, Leeds, UK
Abstract :
Tissue harmonic imaging provides better spatial resolution by producing the image with the second harmonic component generated by nonlinear propagation in tissue. However, the spectral overlap between the transmitted signal and received second harmonic signal results in image artifacts and reduces the image quality. Conventional filtering techniques such as a bandpass filter can separate the second harmonic and fundamental components at the expense of reduced bandwidth.
Keywords :
Fourier transforms; band-pass filters; biological tissues; biomedical ultrasonics; harmonic generation; image resolution; medical image processing; nonlinear acoustics; source separation; ultrasonic propagation; bandpass filter; bandwidth reduction; filtering techniques; fractional Fourier transform; fundamental component separation; image artifacts; image production; image quality reduction; nonlinear propagation; received second harmonic signal spectral overlap; second harmonic component generation; second harmonic separation; spatial resolution; spectrally overlapped second harmonic extraction; tissue harmonic imaging; transmitted signal spectral overlap; Chirp; Fourier transforms; Harmonic analysis; Imaging; Power harmonic filters; Time-frequency analysis; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium (IUS), 2013 IEEE International
Conference_Location :
Prague
Print_ISBN :
978-1-4673-5684-8
DOI :
10.1109/ULTSYM.2013.0010
