Ultrasonic processes and circuits for performing them
AssigneeSchering Corporation
InventorsVolkmar Uhlendorf, Thomas Fritzsch, Joachim Siegert
Life of this patent
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Abstract
A process for selective graphic representation and/or evaluation of the Doppler spectrum of objects limitedly resistant to sonic intensity, for example biological organs and tissues, by an ultrasonic process wherein an examination area is acoustically irradiated, nonlinear oscillations are produced in the examination area by irradiated ultrasonic waves and the signal is evaluated by an ultrasonic converter. Also, a circuit for carrying out the above process is disclosed.
Claims2
Circuit with a multielement ultrasonic converter with n-phase-delayed, actuated ultrasonic converter elements, comprising
- 1. a function generator (1), whose output (2) is connected
- 2. by an n-path signal divider (5),
- 3. n computer-controlled delay circuits (7.1.1 . . . 7.n.1)
- 4. and n T/R switches (3.1.1 . . . 3.n.1) controlled by function generator (1) or a computer, to
- 5. the inputs of the ultrasonic converter elements, whose
- 6. outputs are connected by n T/R switches (3.1.1 . . . 3.n.1) to, in each case, an
- 7. m-path signal divider (10),
- 8. which are connected respectively by m delay circuits (11),
- 9. m fixed or variable circuits (12) for frequency band selection and
- 10. a circuit for in-phase summation and optional signal distribution
- 11. to a system for selective further processing—individually or parallel—of m frequency bands.
Dependencies are inferred from the claim text.