Title :
Passive detection method for synchronizing with resonant oscillations of bubbles
Author :
Carson, Paul L. ; Fowlkes, J. Brian ; Gardner, Edward A.
Author_Institution :
Dept. of Radiol., Univ. of Michigan Med. Center, Ann Abor, MI, USA
Abstract :
In medical ultrasound, microbubbles might be grown in a body fluid to create a bolus of high scattering fluid for study of circulatory or urinary tract dynamics. Microbubble creation and growth via rectified diffusion has been investigated for chirps with a temporally decreasing frequency to drive the growing bubbles at resonance. A method is considered for control of the ultrasound frequency and amplitude to maintain the bubbles at a desired size or growth rate. If the frequency of the ultrasound growth or maintenance field can be modulated over a significant portion of a bubble resonance curve, the modulation of the backscattered or transmitted waveform by the resonance can be used to keep the frequency centered on the resonance, and the amplitude can be adjusted to maintain the desired growth rate
Keywords :
biomedical ultrasonics; bubbles; haemodynamics; backscattered waveform; body fluid; bubbles; chirps; circulatory dynamics; growth rate; high scattering fluid; medical ultrasound; microbubbles; rectified diffusion; resonant oscillations; temporally decreasing frequency; transmitted waveform; urinary tract dynamics; Amplitude modulation; Backscatter; Chirp modulation; Clouds; Frequency modulation; Frequency synchronization; Resonance; Resonant frequency; Size control; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275894
