GB2006434A - Switchable Depth of Focus Pulse-Echo Ultrasonic-imaging Display System - Google Patents

Switchable Depth of Focus Pulse-Echo Ultrasonic-imaging Display System

Info

Publication number
GB2006434A
GB2006434A GB7840784A GB7840784A GB2006434A GB 2006434 A GB2006434 A GB 2006434A GB 7840784 A GB7840784 A GB 7840784A GB 7840784 A GB7840784 A GB 7840784A GB 2006434 A GB2006434 A GB 2006434A
Authority
GB
United Kingdom
Prior art keywords
depth
focus
switching
annular
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7840784A
Other versions
GB2006434B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US05/844,140 external-priority patent/US4138895A/en
Priority claimed from US05/844,141 external-priority patent/US4168628A/en
Application filed by RCA Corp filed Critical RCA Corp
Publication of GB2006434A publication Critical patent/GB2006434A/en
Application granted granted Critical
Publication of GB2006434B publication Critical patent/GB2006434B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/10—Amplitude; Power
    • G01H3/12—Amplitude; Power by electric means
    • G01H3/125—Amplitude; Power by electric means for representing acoustic field distribution
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
    • G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
    • G01S15/8909—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a static transducer configuration
    • G01S15/8915—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a static transducer configuration using a transducer array
    • G01S15/8922—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a static transducer configuration using a transducer array the array being concentric or annular
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
    • G01S7/52046—Techniques for image enhancement involving transmitter or receiver

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The invention permits changing of the effective depth of focus in the system to which the invention relates by providing a transducer unit (10) having a central section (18/16) and a separate surrounding annular section (20/16) which are effective in detecting different parts of the signal portion of the reflected beam, the central section detecting a part returning through only a small portion of the lens aperture and the annular section detecting the part returning through the remainder of the aperture. Switching (12) is coupled to the two transducer sections (18/16, 20/16) for selectively displaying either only the parts detected by the central portion or both that part and the part detected by the annular portion together. The switching can be used to select only the center portion (providing a greater depth of focus) for initial setting up prior to selecting both portions for a high resolution display of a target area in a desired plane with reduced depth focus. Alternatively the switching may be time-controlled relatively to the outward and return journeys of the transmitted pulses to provide maximum resolution within a small focal region of a relatively large aperture lens, using both center and annular portions of the transducer, while structure under examination but outside of that region can be displayed at lower resolution using only the center portion. <IMAGE>
GB7840784A 1977-10-20 1978-10-17 Switchable depth of focus pulse-echo ultra-sonic imaging display system Expired GB2006434B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/844,140 US4138895A (en) 1977-10-20 1977-10-20 Switchable depth of focus pulse-echo ultrasonic-imaging display system
US05/844,141 US4168628A (en) 1977-10-20 1977-10-20 Pulse-echo ultrasonic-imaging display system having time-varied effective aperture

Publications (2)

Publication Number Publication Date
GB2006434A true GB2006434A (en) 1979-05-02
GB2006434B GB2006434B (en) 1982-03-03

Family

ID=27126479

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7840784A Expired GB2006434B (en) 1977-10-20 1978-10-17 Switchable depth of focus pulse-echo ultra-sonic imaging display system

Country Status (4)

Country Link
JP (1) JPS5470675A (en)
DE (1) DE2845791A1 (en)
FR (1) FR2406833A1 (en)
GB (1) GB2006434B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033508A1 (en) * 1980-01-30 1981-08-12 Siemens Aktiengesellschaft Circuit for intermittently transmitting and receiving with only one sound transmitter-transducer
GB2223377A (en) * 1988-09-30 1990-04-04 Dornier Gmbh Piezoelectric transducer
GB2232321A (en) * 1989-03-07 1990-12-05 Mitsubishi Mining & Cement Co Focusing piezoelectric transducer
GB2232323A (en) * 1989-06-02 1990-12-05 Udi Group Ltd Acoustic transducer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242911A (en) * 1979-02-01 1981-01-06 Mediscan, Inc. Ultrasonic medical diagnostic apparatus and method
US4442713A (en) * 1982-03-09 1984-04-17 Sri International Frequency varied ultrasonic imaging array
FR2579886A1 (en) * 1985-04-05 1986-10-10 Edap Ultrasound echography apparatus allowing the display of the blood flow in a vessel
JPS6336172A (en) * 1986-07-29 1988-02-16 Toshiba Corp Ultrasonic coupler

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033508A1 (en) * 1980-01-30 1981-08-12 Siemens Aktiengesellschaft Circuit for intermittently transmitting and receiving with only one sound transmitter-transducer
GB2223377A (en) * 1988-09-30 1990-04-04 Dornier Gmbh Piezoelectric transducer
GB2223377B (en) * 1988-09-30 1993-06-02 Dornier Gmbh A hydrophone and a piezoelectric hydrophone transducer
GB2232321A (en) * 1989-03-07 1990-12-05 Mitsubishi Mining & Cement Co Focusing piezoelectric transducer
GB2232323A (en) * 1989-06-02 1990-12-05 Udi Group Ltd Acoustic transducer

Also Published As

Publication number Publication date
JPS5470675A (en) 1979-06-06
GB2006434B (en) 1982-03-03
DE2845791B2 (en) 1979-10-18
DE2845791A1 (en) 1979-04-26
FR2406833A1 (en) 1979-05-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee