Title:
ULTRASONIC OBSERVING DEVICE
Document Type and Number:
Japanese Patent JP3043857
Kind Code:
B2
Abstract:
PURPOSE: To reduce the influence of noise and to detect the fine voltages of received signals as well by connecting a substrate to execute the logarithmical amplification/detection of input signals to an ultrasonic oscillator and a substrate to execute the analog/digital conversion of amplified received signals by a means equipped with an impedance.
CONSTITUTION: The received signals from a probe are supplied through a connector 2 connected to a transformer 4, and the output terminal of the transformer 4 is connected to a log amplifier 5 of a first analog ground. The output of the log amplifier 5 is passed through a detection circuit 6, variable amplifier 7, attenuator 8 and buffer circuit 9 and guided through a coaxial cable 10 to a second analog ground 11. At the second analog ground 11, inputted signals are passed through a low-pass filter 13, converted to digital signals by an A/D converter 14, latched by a latch circuit 16 of a digital ground 15 and inputted to a DSC 17. Thus, digital noise is attenuated, and the resolution of ultrasonic tomographic images can be improved.
Inventors:
Kazuhiro Misono
Application Number:
JP23816891A
Publication Date:
May 22, 2000
Filing Date:
September 18, 1991
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
A61B8/12; G01N29/22; G01N29/44; G11B23/087; (IPC1-7): A61B8/12; G01N29/22
Domestic Patent References:
| JP63264047A | ||||
| JP62167545A | ||||
| JP2211133A | ||||
| JP399644A | ||||
| JP2286142A | ||||
| JP56144508U |
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)