Graded frequency sensors

Details Graded frequency sensors Graded frequency sensors

1989-05-16

1991-06-25

Jaworski, Francis

Surgery

Truss

Pad

310336, 29 7535, A61B 800

Patent

active

050257900

ABSTRACT:
A graded frequency ultrasonic sensor [10] that compensates for frequency downshifting [32] in the body is disclosed. The outer portion [20] of the sensor's aperture is sensitive to the lower frequency returns which are a consequence of the frequency downshifting. Therefore, the invention achieves a high degree of lateral resolution. The central portion [18, 59] of the sensor is made thinner than the outer portion ]20, 57], so that the central portion is resonant at a higher frequency than the outer portion. Lateral resolution is improved by using the largest possible aperture to receive the downshifted frequencies. Techniques for shaping graded arrays, and for applying impedance matching layers [48] are disclosed for both spherical shells [10] and linear arrays [72]. The invention can be applied to different shapes of sensors, including spherical shells [10] and linear arrays [72].

REFERENCES:
patent: 4385255 (1983-05-01), Yamaguchi et al.
patent: 4478085 (1984-10-01), Sasaki
patent: 4635484 (1987-01-01), Lerch
Marcel Arditi et al., "Transient Fields of Concave Annular Array", Ultrasonic Imaging 3, pp. 37-61 (1981).
M. Arditi et al., "An Annular Array System for High Resolution Breast Echography", Ultrasonic Imaging 4, pp. 1-31 (1982).

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