Title:
ULTRASONIC LINEAR ARRAY TRANSDUCER WITH COLLIMATOR
Document Type and Number:
Japanese Patent JPS58135977
Kind Code:
A
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 DEG 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.
Inventors:
MATSUSOO ODONERU
Application Number:
JP538183A
Publication Date:
August 12, 1983
Filing Date:
January 18, 1983
Export Citation:
Assignee:
GEN ELECTRIC
International Classes:
G01S7/521; G10K11/18; G10K11/30; (IPC1-7): G01S7/52
Domestic Patent References:
| JPS5635076A | 1981-04-07 |
Foreign References:
| US4211948A | 1980-07-08 | |||
| US3733580A | 1973-05-15 |
Attorney, Agent or Firm:
Tokunji Ikunuma