Ultrasonic sensor with starved dilatational modes

Details Ultrasonic sensor with starved dilatational modes Ultrasonic sensor with starved dilatational modes

1989-05-16

1991-10-29

Jaworski, Francis

Surgery

Truss

Pad

310336, A61B 800

Patent

active

050606530

ABSTRACT:
A method and apparatus to improve the performance of an ultrasonic imaging sensor [11] is disclosed. The key to the performance improvement obtained in the present invention is in the matching of sensor element [10] size to the electrical characteristics of the train of pulses [24,32] used to drive the sensor. The matching causes essentially all the energy provided to the sensor [11] to go into the desired sensor resonances, those in the direction of the sensor's thickness dimension [12]. The matching also minimizes the energy which goes into the undesired dilatational resonance modes [16,18] those in the sensor element's width dimension [14]. The invention discloses the matching of each sensor element [10] so that its maximum dilatational response [54] is essentially at the same frequency as every other element in the array, so that dilatational response is substantially reduced for the array as a whole. The invention also disclosed the "fine tuning" of the frequency of the drive pulses, so that the dilatational response is further reduced. The invention therefore permits the fabrication of ultrasonic sensor arrays [11], having high sensitivity, freedom from spurious returns, and low noise signals.

REFERENCES:
patent: 4101795 (1978-07-01), Fukumoto et al.
patent: 4240003 (1980-12-01), Larson, III
patent: 4385255 (1983-05-01), Yamaguchi et al.
patent: 4442715 (1984-04-01), Brisken et al.
"An Annular Array System for High Resolution Brease Echography", by M. Arditi, W. B. Taylor, F. S. Foster and J. W. Hunt; Ultrasonic Imaging 4, 1982, pp. 1-31.

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