WO1997044142A1 - Scanning ultrasound probe - Google Patents

Scanning ultrasound probe Download PDF

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Publication number
WO1997044142A1
WO1997044142A1 PCT/GB1997/001367 GB9701367W WO9744142A1 WO 1997044142 A1 WO1997044142 A1 WO 1997044142A1 GB 9701367 W GB9701367 W GB 9701367W WO 9744142 A1 WO9744142 A1 WO 9744142A1
Authority
WO
WIPO (PCT)
Prior art keywords
transducers
sound wave
scanner
probe
transducer
Prior art date
Application number
PCT/GB1997/001367
Other languages
French (fr)
Inventor
Evelyna Dyson Cantwell
Jack Cantwell
Niels Helth Lauersen
Original Assignee
Evelyna Dyson Cantwell
Jack Cantwell
Niels Helth Lauersen
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
Application filed by Evelyna Dyson Cantwell, Jack Cantwell, Niels Helth Lauersen filed Critical Evelyna Dyson Cantwell
Priority to AU29066/97A priority Critical patent/AU2906697A/en
Publication of WO1997044142A1 publication Critical patent/WO1997044142A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
    • 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
    • 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
    • G01S15/8918—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a static transducer configuration using a transducer array the array being linear
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/34—Sound-focusing or directing, e.g. scanning using electrical steering of transducer arrays, e.g. beam steering
    • G10K11/341—Circuits therefor
    • G10K11/345—Circuits therefor using energy switching from one active element to another

Definitions

  • This invention relates to a scanning ultrasound probe for use in providing ultrasound images below the skin surface, for example below burns or the like, and in particular for providing ultrasound subsurface images of breast tissue etc.
  • a transducer to generate an impulse in the form of a sound wave at a particular frequency. This is known as ultrasound.
  • the transducer is located so that the ultrasound impulse can be emitted in a manner such that it is coupled to the skin surface to be transmitted through the tissue.
  • the impulse is then reflected by the boundaries of various structures that are encountered during the subsurface passage of the impulse. For example, the boundary between two different tissue types or at the interface between burn tissue and healthy tissue will result in a reflection.
  • the transducer is used to detect the reflected sound wave or echo. These reflected sound waves are then processed or translated into an image.
  • a single ultrasound impulse will give information along a single line extending into the tissue perpendicular to the general plane of the skin surface. Therefore, such an impulse will give a one dimensional image showing reflections from structures in the tissue at differing depths below the transmission entry point on the skin.
  • the information gained from such one dimensional images is limited and in clinical practice it is preferred to have a two dimensional image.
  • a two dimensional image is typically obtained from a scanning ultrasound probe.
  • the scanning ultrasound probe has a transducer mounted to a mechanical moving arrangement located in a water bath.
  • the water bath is covered with a membrane of some sort, against which the skin surface is held.
  • the transducer is then mechanically moved by the moving arrangement either linearly or rotationally so that the transmission entry point scans along a linear scan width on the skin surface.
  • the transducer produces an ultrasound impulse having a centre frequency of 20 MHz.
  • the mechanical moving arrangement is constructed so that is can move the transducer a distance of 25.2 ⁇ m between each impulse. Thus, there is a distance of 25.2 ⁇ m between each transmission entry point.
  • the transducer and moving arrangement are operated so that a total of 508 impulses are emitted producing a linear scan width of 12.9 mm for the scanning ultrasound probe.
  • the reflection or echo from an impulse is sampled at a rate of 100 MHz.
  • the transducer must be moved by an accurate mechanical moving arrangement and that a water bath is required to transmit the sound wave to the skin surface. This involves careful and precise control which is costly. Furthermore, the speed of obtaining the ultrasound image is limited by the mechanical moving means which must take into account the fragility of the transducer. In addition, whilst the concept of a scanning ultrasound probe per so would have many applications, the actual use of such a known scanning ultrasound probe is limited due to its construction.
  • a scanning ultrasound probe comprising:- a casing; and a plurality of sound wave transducers mounted in an array within the casing.
  • the probe of the present invention has considerable versatility in its application and uses.
  • the sound wave transducers are mounted in a linear array.
  • At least 56 sound wave transducers are mounted in said array.
  • 128 sound wave transducers are mounted in said array.
  • a scanner comprising a scanning ultrasound probe as hereinbefore defined and a transmission control means capable of actuating said transducers singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse in turn.
  • the scanner further comprises receipt control means capable of actuating a transducer to receive reflected sound waves.
  • the transducer has a dual function and a separate receiver for reflected sound waves is not required.
  • the receipt control means actuates at least a substantial proportion of all said transducers to receive reflected sound waves after each said respective sound wave impulse.
  • the scanner of the present invention is better able at a defined frequency to detect reflected sound waves than equivalent scanners of the prior art.
  • said receiving control means actuates all said plurality of transducers to receive reflected sound waves.
  • the scanner includes sampling means for sampling the transducer outputs in response to reflected sound waves; and an image processing means for translating the sampled transducer outputs into image format.
  • a method of operating an ultrasound scanner the steps comprising:- mounting a plurality of sound wave transducers in an array; actuating said transducers singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse. In this way, a two dimensional ultrasonic image can be produced without movement of the probe.
  • the method further comprises the step of actuating at least a substantial proportion of all said transducers to receive reflected sound waves after each said respective sound wave impulse.
  • the scanner of the present invention is better able at a defined frequency to detect reflected sound waves than equivalent scanners of the prior art.
  • Figure l illustrates a scanning ultrasound probe embodying the present invention
  • Figure 2 illustrates an ultrasound scanner embodying the present invention employing the probe shown in figure 1.
  • a scanning ultrasound probe 36 has a casing 37 which has mounted therein an acoustic module 38.
  • the acoustic module 38 comprises a linear array of 128 transducers which are located side by side at 0.1 mm centers. The transducers are fixed in place, preferably by adhesive although over fixing means can be employed.
  • Each single transducer has a rectangular cross-section and is built on a polymer basic (polyvenylidendifluoride) .
  • the transducer can be fired to emit sound waves with a frequency of 20 MHz with a focal length of 20 mm.
  • the ultrasound beam width in the focus area is about 166 ⁇ m and the axial resolution (into the depth of the skin) is about 65 ⁇ m.
  • a multi conductor cable 39 emerges from the casing to be connected to various electronic components as will be apparent from figure 2.
  • FIG 2 there is shown a scanner including the scanning ultrasound probe of figure 1.
  • the ultrasound probe 30 is connected to a 128 to 1 multiplexer switch unit 31.
  • the multiplexer switch unit 31 is connected by a bus 33 to a probe controller 32 which tells the switch unit 31, in a transmit mode, which particular single one of the 128 transducers of the acoustic module 38 is to be operated next for emission of the sound wave impulse or which tells the switch unit 31, in a receive mode, to multiplex the 128 transducers of the acoustic module 38 to 1 for receiving the reflected sound wave or echo.
  • the probe controller 32 is also connected to a drive unit 34 which is connected to the switch unit 31.
  • the drive unit 34 can be actuated by the probe controller 32 to provide the appropriate transducer trigger drive pulse in the transmit mode so as to operate or fire the particular single transducer selected via bus 33 to emit a sound wave impulse.
  • the drive unit 34 also includes an amplifier which amplifies the reflected sound wave signal received via the switch unit 31 in the receive mode, and applies an exponential time gain compensation (TGC) in a similar manner to that disclosed in US-A-5 031 627 so as to provide an output to the probe controller 32.
  • TGC exponential time gain compensation
  • the probe controller 32 has a 100 MHz digitizer, which samples this analogue output from the drive unit 34, as well as a setting means for setting the exponential TGC gain and rate.
  • the probe controller 32 is also connected to a computer 35 which controls the timing and selection of which transducer is to be operated, controls the sampling and hence conversion of the reflected sound wave and displays on a display (not shown) the image translated on the basis of the sampled reflected sound wave in a 256 color representation of the reflected sound wave.
  • the display can be printed or put into archive storage according to patient.
  • the image of such a scanner can depict a linear scan width of the skin area of 12.8 mm wide and with differing selected depths, for example in the range from 3.6 to 14.4 mm.
  • the firing rate of the transducer is typically at 1 ms intervals.
  • the computer 35 selects each transducer of the probe 30 in succession during successive transmit modes with a receive mode between the emission of each sound wave impulse.
  • a linear scan width or transmission pattern is produced over time.
  • the probe can be applied directly to the skin surface without the need for a water bath. Furthermore, the probe can be auto-indexed and translated along a predetermined path, for example around a breast.
  • the structure of the linear transducer array enables it to be mounted in various probes both for external and internal body investigations.
  • the number of transducers used and the array thereof can be varied according to requirements.
  • the frequency and other operating characteristics of the transducers can also be varied. It will be understood that the embodiment illustrated shows an application of the invention in one form only for the purposes of illustration. In practice, the invention may be applied to many different configurations , the detailed embodiments being straightforward for those skilled in the art to implement.

Abstract

The present invention relates to a scanning ultrasound probe (36) and a method of operating an ultrasound scanner. The scanning ultrasound probe has a casing (37) which has an acoustic module (38) mounted therein. The acoustic module has a linear array of 128 transducers located side by side at 0.1 mm centres. The transducers are actuated singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse in turn. A substantial proportion of all the transducers are actuated to receive reflected sound waves after the emission of each sound wave impulse.

Description

SCANNING ULTRASOUND PROBE
This invention relates to a scanning ultrasound probe for use in providing ultrasound images below the skin surface, for example below burns or the like, and in particular for providing ultrasound subsurface images of breast tissue etc. It is known from the prior art to operate or fire a transducer to generate an impulse in the form of a sound wave at a particular frequency. This is known as ultrasound. The transducer is located so that the ultrasound impulse can be emitted in a manner such that it is coupled to the skin surface to be transmitted through the tissue. The impulse is then reflected by the boundaries of various structures that are encountered during the subsurface passage of the impulse. For example, the boundary between two different tissue types or at the interface between burn tissue and healthy tissue will result in a reflection. After the emission of the ultrasound impulse, the transducer is used to detect the reflected sound wave or echo. These reflected sound waves are then processed or translated into an image.
A single ultrasound impulse will give information along a single line extending into the tissue perpendicular to the general plane of the skin surface. Therefore, such an impulse will give a one dimensional image showing reflections from structures in the tissue at differing depths below the transmission entry point on the skin. The information gained from such one dimensional images is limited and in clinical practice it is preferred to have a two dimensional image.
A two dimensional image is typically obtained from a scanning ultrasound probe. The scanning ultrasound probe has a transducer mounted to a mechanical moving arrangement located in a water bath. The water bath is covered with a membrane of some sort, against which the skin surface is held. The transducer is then mechanically moved by the moving arrangement either linearly or rotationally so that the transmission entry point scans along a linear scan width on the skin surface. In one example of such a scanning ultrasound probe, the transducer produces an ultrasound impulse having a centre frequency of 20 MHz. The mechanical moving arrangement is constructed so that is can move the transducer a distance of 25.2 μm between each impulse. Thus, there is a distance of 25.2 μm between each transmission entry point. The transducer and moving arrangement are operated so that a total of 508 impulses are emitted producing a linear scan width of 12.9 mm for the scanning ultrasound probe. The reflection or echo from an impulse is sampled at a rate of 100 MHz.
However, it will be apparent that the transducer must be moved by an accurate mechanical moving arrangement and that a water bath is required to transmit the sound wave to the skin surface. This involves careful and precise control which is costly. Furthermore, the speed of obtaining the ultrasound image is limited by the mechanical moving means which must take into account the fragility of the transducer. In addition, whilst the concept of a scanning ultrasound probe per so would have many applications, the actual use of such a known scanning ultrasound probe is limited due to its construction.
It is therefore an object of the present invention to provide an improved and simplified scanning ultrasound probe which overcomes the above mentioned problems. According to one aspect of the present invention there is provided a scanning ultrasound probe comprising:- a casing; and a plurality of sound wave transducers mounted in an array within the casing. This construction of probe enables an ultrasound scan to be produced by actuating the transducers in turn without the need to actually move the transducers. Consequently, a much simpler and easier to operate probe can be produced without the need for an accurate and carefully controlled moving arrangement. In effect, a solid state probe is produced.
Moreover, because the transducer is not moved, the problems of coupling the sound wave to the skin surface are much reduced thereby avoiding the need for a water bath. Consequently, the probe of the present invention has considerable versatility in its application and uses.
Preferably, the sound wave transducers are mounted in a linear array.
Thus, by operating the transducers in turn, a linear scan width can be obtained, although the present invention is not limited to such a linear array.
Conveniently, at least 56 sound wave transducers are mounted in said array.
In one embodiment, 128 sound wave transducers are mounted in said array.
By having 128 sound wave transducers, transmission control and receipt control of the sound waves can be easily matched to microprocessor control.
According to another aspect of the present invention there is provided a scanner comprising a scanning ultrasound probe as hereinbefore defined and a transmission control means capable of actuating said transducers singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse in turn.
In this way, a two dimensional ultrasonic image can be produced without movement of the probe.
In a preferred embodiment, the scanner further comprises receipt control means capable of actuating a transducer to receive reflected sound waves.
In this way, the transducer has a dual function and a separate receiver for reflected sound waves is not required.
Preferably, the receipt control means actuates at least a substantial proportion of all said transducers to receive reflected sound waves after each said respective sound wave impulse.
As a result, a large number of transducers listen for and receive the sound waves reflected from a single ultrasound impulse. This improves the sensitivity of the scanner, improves the signal to noise ratio, and enables sound waves from deeper structures to be detected. Accordingly, the scanner of the present invention is better able at a defined frequency to detect reflected sound waves than equivalent scanners of the prior art.
Conveniently, said receiving control means actuates all said plurality of transducers to receive reflected sound waves.
This optimises the receiving response of the scanner. In a particular embodiment, the scanner includes sampling means for sampling the transducer outputs in response to reflected sound waves; and an image processing means for translating the sampled transducer outputs into image format. According to yet another aspect of the present invention there is provided a method of operating an ultrasound scanner, the steps comprising:- mounting a plurality of sound wave transducers in an array; actuating said transducers singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse. In this way, a two dimensional ultrasonic image can be produced without movement of the probe.
Preferably, the method further comprises the step of actuating at least a substantial proportion of all said transducers to receive reflected sound waves after each said respective sound wave impulse.
As a result, a large number of transducers listen for and receive the sound waves reflected from a single ultrasound impulse. This improves the sensitivity of the scanner, improves the signal to noise ratio, and enables sound waves from deeper structures to be detected. Accordingly, the scanner of the present invention is better able at a defined frequency to detect reflected sound waves than equivalent scanners of the prior art.
An example of the present invention will now be described with reference to the accompanying drawings, in which:-
Figure l illustrates a scanning ultrasound probe embodying the present invention; and Figure 2 illustrates an ultrasound scanner embodying the present invention employing the probe shown in figure 1.
Referring to figure 1, a scanning ultrasound probe 36 has a casing 37 which has mounted therein an acoustic module 38. The acoustic module 38 comprises a linear array of 128 transducers which are located side by side at 0.1 mm centers. The transducers are fixed in place, preferably by adhesive although over fixing means can be employed. Each single transducer has a rectangular cross-section and is built on a polymer basic (polyvenylidendifluoride) . The transducer can be fired to emit sound waves with a frequency of 20 MHz with a focal length of 20 mm. The ultrasound beam width in the focus area is about 166 μm and the axial resolution (into the depth of the skin) is about 65 μm. A multi conductor cable 39 emerges from the casing to be connected to various electronic components as will be apparent from figure 2.
Referring to figure 2, there is shown a scanner including the scanning ultrasound probe of figure 1. The ultrasound probe 30 is connected to a 128 to 1 multiplexer switch unit 31. The multiplexer switch unit 31 is connected by a bus 33 to a probe controller 32 which tells the switch unit 31, in a transmit mode, which particular single one of the 128 transducers of the acoustic module 38 is to be operated next for emission of the sound wave impulse or which tells the switch unit 31, in a receive mode, to multiplex the 128 transducers of the acoustic module 38 to 1 for receiving the reflected sound wave or echo.
The probe controller 32 is also connected to a drive unit 34 which is connected to the switch unit 31. The drive unit 34 can be actuated by the probe controller 32 to provide the appropriate transducer trigger drive pulse in the transmit mode so as to operate or fire the particular single transducer selected via bus 33 to emit a sound wave impulse. The drive unit 34 also includes an amplifier which amplifies the reflected sound wave signal received via the switch unit 31 in the receive mode, and applies an exponential time gain compensation (TGC) in a similar manner to that disclosed in US-A-5 031 627 so as to provide an output to the probe controller 32. The probe controller 32 has a 100 MHz digitizer, which samples this analogue output from the drive unit 34, as well as a setting means for setting the exponential TGC gain and rate.
The probe controller 32 is also connected to a computer 35 which controls the timing and selection of which transducer is to be operated, controls the sampling and hence conversion of the reflected sound wave and displays on a display (not shown) the image translated on the basis of the sampled reflected sound wave in a 256 color representation of the reflected sound wave. The display can be printed or put into archive storage according to patient.
The image of such a scanner can depict a linear scan width of the skin area of 12.8 mm wide and with differing selected depths, for example in the range from 3.6 to 14.4 mm. The firing rate of the transducer is typically at 1 ms intervals.
Essentially, the computer 35 selects each transducer of the probe 30 in succession during successive transmit modes with a receive mode between the emission of each sound wave impulse. Thus, a linear scan width or transmission pattern is produced over time.
It will be apparent that the probe can be applied directly to the skin surface without the need for a water bath. Furthermore, the probe can be auto-indexed and translated along a predetermined path, for example around a breast.
In addition, the structure of the linear transducer array enables it to be mounted in various probes both for external and internal body investigations. The number of transducers used and the array thereof can be varied according to requirements. The frequency and other operating characteristics of the transducers can also be varied. It will be understood that the embodiment illustrated shows an application of the invention in one form only for the purposes of illustration. In practice, the invention may be applied to many different configurations , the detailed embodiments being straightforward for those skilled in the art to implement.

Claims

1. A scanning ultrasound probe comprising:- a casing; and a plurality of sound wave transducers mounted in an array within the casing.
2. A probe according to claim 1 wherein said sound wave transducers are mounted in a linear array.
3. A probe according to claim 1 or 2 wherein at least 56 sound wave transducers are mounted in said array.
4. A probe according to claim 1 or 2 wherein 128 sound wave transducers are mounted in said array.
5. A scanner comprising a scanning ultrasound probe according to any preceding claim and a transmission control means capable of actuating said transducers singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse in turn.
6. A scanner according to claim 5 further comprises receipt control means capable of actuating a transducer to receive reflected sound waves.
7. A scanner according to claim 6 wherein the receipt control means actuates at least a substantial proportion of all said transducers to receive reflected sound waves after each said respective sound wave impulse.
8. A scanner according to claim 7 wherein said receiving control means actuates all said plurality of transducers to receive reflected sound waves.
9. A scanner according to any one of claims 5 to 8 further comprising sampling means for sampling the transducer outputs in response to reflected sound waves; and an image processing means for translating said transducer outputs into image format.
10. A method of operating an ultrasound scanner, the steps comprising:- mounting a plurality of sound wave transducers in an array; actuating said transducers singly in a predetermined pattern so that the transducers individually emit a respective sound wave impulse in turn.
11. A method according to claim 10 further comprising the step of actuating at least a substantial proportion of all said transducers to receive reflected sound waves after each said respective sound wave impulse.
PCT/GB1997/001367 1996-05-20 1997-05-20 Scanning ultrasound probe WO1997044142A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29066/97A AU2906697A (en) 1996-05-20 1997-05-20 Scanning ultrasound probe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9610511A GB9610511D0 (en) 1996-05-20 1996-05-20 Scanning ultrasound probe
GB9610511.9 1996-05-20

Publications (1)

Publication Number Publication Date
WO1997044142A1 true WO1997044142A1 (en) 1997-11-27

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AU (1) AU2906697A (en)
GB (1) GB9610511D0 (en)
WO (1) WO1997044142A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9078593B2 (en) 2008-02-05 2015-07-14 Fujitsu Limited Ultrasound probe device and method of operation
CN110244196A (en) * 2018-03-09 2019-09-17 保定华创电器有限公司 A kind of ultrasound-enhanced receiver and its design method for measurement of partial discharge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU490412B1 (en) * 1974-03-18 1976-09-23 Commonwealth Of Australia, The A multiple line-of-sight ultrasonic visualization apparatus
GB2035010A (en) * 1978-11-08 1980-06-11 Gen Electric Front surface matched ultrasonic transducer array with wide field of view
EP0283854A1 (en) * 1987-03-10 1988-09-28 Matsushita Electric Industrial Co., Ltd. Ultrasonic probe having ultrasonic propagation medium
EP0641606A2 (en) * 1993-09-07 1995-03-08 Acuson Corporation Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU490412B1 (en) * 1974-03-18 1976-09-23 Commonwealth Of Australia, The A multiple line-of-sight ultrasonic visualization apparatus
GB2035010A (en) * 1978-11-08 1980-06-11 Gen Electric Front surface matched ultrasonic transducer array with wide field of view
EP0283854A1 (en) * 1987-03-10 1988-09-28 Matsushita Electric Industrial Co., Ltd. Ultrasonic probe having ultrasonic propagation medium
EP0641606A2 (en) * 1993-09-07 1995-03-08 Acuson Corporation Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9078593B2 (en) 2008-02-05 2015-07-14 Fujitsu Limited Ultrasound probe device and method of operation
CN110244196A (en) * 2018-03-09 2019-09-17 保定华创电器有限公司 A kind of ultrasound-enhanced receiver and its design method for measurement of partial discharge
CN110244196B (en) * 2018-03-09 2023-02-03 保定华创电气有限公司 Ultrasonic enhanced receiver for partial discharge measurement and design method thereof

Also Published As

Publication number Publication date
GB9610511D0 (en) 1996-07-31
AU2906697A (en) 1997-12-09

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