DocumentCode :
3461452
Title :
C-scan imaging by radiation force stimulated acoustic emission method
Author :
Fatemi, Mostafa ; Greenleaf, James F.
Author_Institution :
Ultrasound Res., Mayo Clinic, Rochester, MN, USA
Volume :
2
fYear :
1996
fDate :
3-6 Nov 1996
Firstpage :
1459
Abstract :
A novel C-scan imaging method is presented. This method utilizes the radiation force to stimulate an acoustic emission by the object at low frequencies. The radiation force, which is highly localized, is produced employing two intersecting focused ultrasound beams driven by two CW sources at slightly different frequencies. The acoustic emission is generated at the difference, or the beat, frequency. This field is nondirective and is detected by a hydrophone. It is shown that the amplitude of the acoustic field is linearly proportional to the peak instantaneous ultrasound power. This has been verified experimentally using a pinhead object and two identical transducers in a water tank. C-scan images are obtained by displaying the amplitude of the acoustic field versus beam position while the object is raster scanned
Keywords :
acoustic emission; acoustic field; biomedical ultrasonics; hydrophones; radiation pressure; ultrasonic focusing; ultrasonic materials testing; ultrasonic transducers; C-scan imaging; CW sources; acoustic field amplitude; beam position; beat frequency; difference frequency; hydrophone; intersecting focused ultrasound beams; low frequencies; materials science; medical diagnosis; nondestructive inspection; nondirective field; peak instantaneous ultrasound power; pinhead object; radiation force stimulated acoustic emission method; raster scanned object; transducers; water tank; Acoustic beams; Acoustic emission; Acoustic imaging; Acoustic signal detection; Acoustic transducers; Focusing; Frequency; Sonar equipment; Ultrasonic imaging; Ultrasonic transducers;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
ISSN :
1051-0117
Print_ISBN :
0-7803-3615-1
Type :
conf
DOI :
10.1109/ULTSYM.1996.584341
Filename :
584341
Link To Document :
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