Title :
Differentiation of moving scatterers with different velocities using trapezoid filter and pulse echo ultrasound
Author :
Zheng, Yi ; Yao, Aiping ; Greenleaf, James F.
Author_Institution :
Dept. of Electr. Eng., St. Cloud State Univ., MN, USA
Abstract :
A trapezoid filter is introduced to map Doppler signals to spectral lines that associate to different velocities of scatterers. The filter completely rejects frequencies outside of a trapezoid area in the two-dimensional Fourier domain of Doppler RF signals. A three-dimensional Doppler image (or a movie of a two-dimensional image) with dimensions of location, Doppler spectrum, and time, can be obtained by listing the spectral lines along the beam axis. Gated integration of the Doppler image produces a coded map showing moving scatterers with different velocities. Experiments were performed using a peripheral vascular Doppler flow phantom. The method successfully differentiated the scatterers with different velocities at 29.8 cm/s and 14.6 cm/s. This new approach has potential for characterizing moving scatterers having different velocities within a sample volume
Keywords :
Doppler measurement; acoustic filters; biomedical ultrasonics; blood flow measurement; ultrasonic scattering; ultrasonic velocity; 14.6 cm/s; 29.8 cm/s; Doppler RF signals; Doppler signals; Doppler spectrum; beam axis; coded map; different velocities; gated integration; location; moving scatterer differentiation; peripheral vascular Doppler flow phantom; pulse echo ultrasound; sample volume; spectral lines; three-dimensional Doppler image; time; trapezoid filter; two-dimensional Fourier domain; two-dimensional image; Clouds; Direction of arrival estimation; Filters; Fourier transforms; Frequency; Imaging phantoms; Motion pictures; Scattering; Transducers; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.921604