Collimation of ultrasonic linear array transducer

Details Collimation of ultrasonic linear array transducer Collimation of ultrasonic linear array transducer

1982-01-18

1984-04-10

Howell, Kyle L.

Surgery

Truss

Pad

310336, 73644, A61B 1000, H01L 4122

Patent

active

044415036

ABSTRACT:
The beam characteristics of individual array elements of a linear transducer array are altered by collimation of ultrasonic waves using critical angle effects. A phased array transducer for a medical imaging system with a 90.degree. image sensor has a collimator which is a thin sheet of polyethylene. Acoustic waves whose angle of incidence is greater than the critical angle are totally reflected. Insignificant ultrasonic energy is generated outside of the imaged sector and there is a modest insertion loss over the acceptance region.

REFERENCES:
patent: 3971962 (1976-07-01), Green
patent: 4197921 (1980-04-01), Alphonse et al.
patent: 4211948 (1980-07-01), Smith et al.
patent: 4211949 (1980-07-01), Brisken et al.
patent: 4361044 (1982-11-01), Kupperman et al.
patent: 4385255 (1983-05-01), Yamaguchi et al.

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