Ultrasonic interrogating system and exciter-detector circuit the

Details Ultrasonic interrogating system and exciter-detector circuit the Ultrasonic interrogating system and exciter-detector circuit the

1977-10-25

1981-08-18

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

73612, 73626, H04N 530

Patent

active

042850100

ABSTRACT:
In order to obviate the necessity for providing a complete channel of electronics for each transducer of an array incorporated into a real-time ultrasonic imaging system, all system transducers are disposed in apparent series with a single inductor as to direct current. Charging resistors permit each transducer to slowly capacitively charge to a predetermined voltage under static conditions. When a switching transistor disposed in series with a given transducer is placed in the conducting state, the transducer rapidly discharges and mechanically deflects to introduce an ultrasonic pulse into an object. While the switching transistor remains conductive, the inductor and transducer are in parallel circuit as to echo signals returning to the transducer. When the switching transistor is rendered non-conductive, the transducer again charges capacitively in anticipation of a succeeding cycle. All echo signals sensed are amplified by a single preamplifier and applied to a display which is sweep coordinated with the sequence of transducer energization.

REFERENCES:
patent: 2852676 (1958-09-01), Joy
patent: 3086195 (1963-04-01), Halliday
patent: 3387257 (1968-06-01), Brech
patent: 3555889 (1971-01-01), Weighart
patent: 3672210 (1972-06-01), Cressman et al.
patent: 3820387 (1974-06-01), Grabendorfer et al.
patent: 3939696 (1976-02-01), Kossoff
Electro-Scanning Ultrasonic Diagnostic Equipment by Rokuro Uchida, Yoshio Hagiwara & Takasuke Irie, Japan Medical Electronics 71/72, pp. 58-62.

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