KR100242625B1 - Ultrasonic focusing apparatus of ultrasonic converter for medical - Google Patents

Ultrasonic focusing apparatus of ultrasonic converter for medical Download PDF

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KR100242625B1
KR100242625B1 KR1019970047763A KR19970047763A KR100242625B1 KR 100242625 B1 KR100242625 B1 KR 100242625B1 KR 1019970047763 A KR1019970047763 A KR 1019970047763A KR 19970047763 A KR19970047763 A KR 19970047763A KR 100242625 B1 KR100242625 B1 KR 100242625B1
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ultrasonic
focusing
curvature
acoustic matching
matching layer
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KR1019970047763A
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Korean (ko)
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KR19990025909A (en
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김성수
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한진호
대원전자주식회사
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
    • A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/13—Tomography
    • 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
    • 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
    • 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
    • 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
    • G01S7/52053—Display arrangements
    • G01S7/52057—Cathode ray tube displays
    • G01S7/5206—Two-dimensional coordinated display of distance and direction; B-scan display

Abstract

본 발명은 인체 내부의 단면을 초음파를 이용하여 영상화하는 장치에 사용되는 초음파 진단기용 변환기에서 폭 방향으로의 집속방식을 2중 포커싱(focusing)으로 초음파 집속초점을 맞출 수 있게 하여 제작공정의 편의성과 고감도의 변환기를 제공할 수 있도록 한 것이다.The present invention enables the focusing method in the width direction in the ultrasonic diagnostic transducer used in the apparatus for imaging the cross section of the human body using the ultrasonic wave to focus the ultrasonic focusing focused by the double focusing (convenience and convenience of the manufacturing process) It is to provide a highly sensitive converter.

즉, 압전체(1)의 곡률과 제1,2차 음향 정합층(2)(3)의 곡률이 일치되게 형성하고 제2차 음향 정합층(3) 위에 인체에 비해 작은 음향렌즈(4)를 형성시켜 폭 방향으로 굴절에 의한 2중 포커싱으로 초음파 집속초점을 맞출 수 있게 한 의료용 초음파 변환기의 집속장치에 관한 것이다.That is, the curvature of the piezoelectric body 1 and the curvatures of the first and the second acoustic matching layers 2 and 3 are formed to match, and the acoustic lenses 4 smaller than the human body are placed on the second acoustic matching layer 3. The present invention relates to a focusing apparatus for medical ultrasound transducers which is formed so as to focus the ultrasound focus by double focusing by refraction in the width direction.

Description

의료용 초음파 변환기의 초음파 집속장치Ultrasound Focusing Device for Medical Ultrasound Converter

본 발명은 인체 내부의 단면을 초음파를 이용하여 영상화하는 장치에 사용되는 초음파 진단기용 변환기에서 폭 방향으로의 초음파 집속방식을 2중 포커싱(focusing)으로 초음파 집속초점을 맞출 수 있게 하여 제작공정의 편의성과 고감도의 초음파 변환기를 제공할 수 있도록 한 것이다.The present invention allows the ultrasound focusing method in the width direction in the ultrasound diagnostic transducer used in the apparatus for imaging the cross section of the human body using the ultrasound to focus the ultrasound focusing by double focusing (convenience of the manufacturing process) It is to provide an ultrasonic transducer with high sensitivity.

종래에 이 분야 초음파 진단기용 초음파 변환기는 다음과 같은 여러 방식으로 적용되고 있다.BACKGROUND ART Ultrasonic transducers for ultrasonic diagnostics in this field have been applied in various ways as follows.

첫째, 폭 방향으로의 초음파 집속을 위해서 초음파를 발생시키는 압전체의 곡률을 이용한 방식으로 초음파 집속을 하기 위한 방식으로서 압전체의 곡률을 초음파 집속을 하기 위한 지점에 맞추고 제1차 음향 정합층(matching layer)을 평면으로 형성시키고 여기에 제2차 정합층을 파장의 1/4로 만들어서 제품을 제작한다.(제3(a)도 참조)First, a method for focusing the ultrasound by using the curvature of the piezoelectric body to generate ultrasonic waves for the ultrasonic focusing in the width direction, the first acoustic matching layer (aligning the curvature of the piezoelectric to the point for the ultrasonic focusing) Is formed into a plane, and the secondary matching layer is made into 1/4 of the wavelength to manufacture a product (see also third (a)).

이 기술은 압전체의 곡률을 이용하여 초음파를 집속하기 때문에 초음파를 효과적으로 집속할 수 있고 압전체의 유효진동면적이 넓기 때문에 변환기의 감도가 좋아지는 이점이 있는 대신에 제1차 음향 정합층의 두께를 정확하게 조정할 수 없어서 변환기의 대역폭이 좁아지고 펄스의 폭이 넓어져서 이미지(image)에서의 측 방향 해상도가 많이 떨어지는 단점이 있고, 압전체를 각각의 요소(clement)로 분리하기 위하여 절단(dicing)할 경우 압전체의 곡률이 크기 때문에 절단날과 압전체가 쉽게 파손되는 제작 공정상의 단점이 있다.This technology focuses the ultrasonic waves using the curvature of the piezoelectric body, so that the ultrasonic wave can be effectively focused and the effective vibration area of the piezoelectric body has the advantage of improving the sensitivity of the transducer. Instead, it accurately adjusts the thickness of the first acoustic matching layer. The narrower the bandwidth of the transducer and the wider the pulse, the lower the lateral resolution in the image, and the piezoelectric element in the case of dividing the piezoelectric element into separate elements Since the curvature is large, there is a disadvantage in the manufacturing process that the cutting blade and the piezoelectric body are easily broken.

둘째, 음향렌즈를 마지막 음향 정합층에 사용하여 초음파의 굴절을 이용한 초음파 집속방식이 있다.Second, there is an ultrasonic focusing method using the refraction of the ultrasonic wave by using the acoustic lens in the last acoustic matching layer.

음속이 다른 매질을 초음파가 진행할 경우 입사각과 굴절각이 음속의 비에 따라 달라지게 되므로 마지막 음향 정합층에 원하는 초음파 집속부 위에 맞는 음향렌즈의 곡률을 형성시켜서 초음파를 집속시킨다.(제3(b)도 참조)When ultrasonic waves proceed to different media, the angle of incidence and the angle of refraction will vary depending on the ratio of the speed of sound, thereby converging the ultrasonic waves by forming a curvature of the acoustic lens that fits on the desired ultrasonic focusing portion in the final acoustic matching layer. See also)

이 방식은 압전체가 평면이므로 음향 정합층을 만들거나 압전체를 제작하는 데에는 용이하지만 압전체의 유효진동면적이 압전체의 곡률을 이용한 것에 비해 작고 초음파가 음향 렌즈층을 투과하면서 심한 감쇠가 발생하기 때문에 변환기의 감도가 떨어지는 단점이 있다.This method is easy to make an acoustic matching layer or a piezoelectric material because the piezoelectric plane is flat, but the effective vibration area of the piezoelectric body is smaller than the curvature of the piezoelectric material, and the ultrasonic wave penetrates the acoustic lens layer, causing severe attenuation. There is a disadvantage of low sensitivity.

셋째, 압전체의 곡률과 음향 정합층의 곡률을 일치시키고 제3차 음향 정합층(3')을 인체의 음속과 같은 음속을 가지는 물질로 형성시켜서 초음파가 굴절하지 않도록 하여 압전체의 곡률 중심에 초음파가 집속되게 한 방식이 있다.(제3(c)도 참조)Third, by matching the curvature of the piezoelectric material with the curvature of the acoustic matching layer and forming the third acoustic matching layer 3 'with a material having the same sound speed as the sound velocity of the human body, the ultrasonic wave is not refracted so that the ultrasonic wave is centered on the curvature of the piezoelectric body. There is a way to focus (see also section 3 (c)).

이는 매칭층의 두께를 조정할 수가 있어서 측 방향의 해상도를 양호하게 할 수 있는 대신 압전체의 곡률이 크므로 절단시(dicing)에 절단날(brade)이 깊이 들어가야 하므로 날과 압전체가 쉽게 파손되는 제작공정상의 단점이 있다.This is because the thickness of the matching layer can be adjusted to improve the lateral resolution, but the curvature of the piezoelectric material is large, so that a cutting blade must enter deeply during cutting, so that the blade and the piezoelectric body are easily broken. There are disadvantages.

따라서, 본 발명은 이러한 문제점들을 해결하기 위하여 압전체의 곡률과 음향 정합층의 곡률을 일치시켜 이미지의 측방향 해상도를 좋게 하고 실제 폭 방향의 초음파 집속점에서부터 먼 거리에 집속 되도록 곡률을 형성시키고 여기서 발생되는 집속거리의 불일치를 보완하기 위해 제2차 음향정합층 위해 음향렌즈(Acoustic Lens)를 형성시켜 굴절에 의해 집속방식으로 집속거리를 원하는 위치로 맞출 수 있게 함으로서 압전체의 곡률을 제작할 수 있어 절단깊이를 낮게 하고 고감도 변환기를 얻을 수 있도록 한 것이다.Accordingly, in order to solve these problems, the present invention matches the curvature of the piezoelectric body with the curvature of the acoustic matching layer to improve the lateral resolution of the image and to form a curvature so as to focus at a distance from the ultrasonic focusing point in the actual width direction. In order to compensate for the mismatch of the focusing distance, an acoustic lens is formed for the second acoustic matching layer, and the curvature of the piezoelectric body can be made by adjusting the focusing distance to a desired position by focusing by refraction. It is to make the low and high sensitivity converter.

제1도는 본 발명에 따른 초음파 변환기의 단면도.1 is a cross-sectional view of an ultrasonic transducer according to the present invention.

제2도는 본 발명의 요부 확대 단면도.2 is an enlarged cross-sectional view of the main portion of the present invention.

제3(a), (b), (c)도는 종래 초음파 집속장치를 나타낸 단면도.3 (a), (b) and (c) are cross-sectional views showing a conventional ultrasonic focusing apparatus.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 압전체 2 : 제1차 음향 정합층1: piezoelectric material 2: first acoustic matching layer

3 : 제2차음향 정합층 4 : 음향렌즈3: second acoustic matching layer 4: acoustic lens

5 : 인쇄회로기판 6 : 도선5: printed circuit board 6: wire

7 : 후면층 8 : 등박7: back layer 8: back

(Cw) : 인체의 음속 (Cm) : 음향렌즈의 음속(Cw): Sound velocity of human body (Cm): Sound velocity of acoustic lens

(R) : 압전체의 곡률(R): curvature of the piezoelectric body

이하, 본 발명의 바람직한 실시예를 첨부한 도면에 따라 상세히 설명하고자 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제1도는 본 발명에 따른 초음파 변환기를 나타낸 것으로, 곡률 형태로 만든 압전체(1)와, 여기에 에폭시와 필터를 적당량 혼합하여 만든 제1차 음향 정합층(2)을 형성시키되 음향 정합층의 두께를 일정하게 설정하기 위해 곡면연마를 하고, 여기에 같은 방법으로 제2차 음향 정합층(3)을 제1차 음향 정합층(2) 위해 형성시키고, 압전체(1)를 각각의 요소로 분리하기 위하여 절단한 다음 각각의 요소에 전기신호의 입출력을 위해 인쇄회로기관[P.C.B](5)과 압전체(1)를 가는 도선(6)으로 연결한다.1 shows an ultrasonic transducer according to the present invention, in which a piezoelectric body 1 made of a curvature form and a primary acoustic matching layer 2 made by mixing an appropriate amount of epoxy and a filter are formed thereon, and the thickness of the acoustic matching layer is shown. The surface polishing is performed to set the constant, and the secondary acoustic matching layer 3 is formed for the primary acoustic matching layer 2 in the same manner, and the piezoelectric body 1 is separated into the respective elements. After cutting, the printed circuit unit [PCB] 5 and the piezoelectric element 1 are connected to each element by a thin wire 6 for input and output of an electric signal.

이어서 후면방향의 초음파 흡수를 위하여 에폭시와 필터를 적절하게 배합시켜 압전체(1) 후면에 후면층(7)을 형성하고 등박(8)을 이용하여 초음파 변환기의 양쪽을 감싼 뒤에 제2차 음향 정합층(3) 위에 인체의 음속(Cw)에 비해 음속(Cm)이 작은 음향렌즈(4)를 형성시켜서 된 것이다.Subsequently, an epoxy and a filter are suitably combined to form a rear layer 7 on the back of the piezoelectric body 1 and the second acoustic matching layer is wrapped around both sides of the ultrasonic transducer by using the thin foil 8. (3) The acoustic lens 4 is formed to have a smaller sound velocity Cm than the sound velocity Cw of the human body.

제2도는 상기한 본 발명의 요부 확대를 나타낸 것으로서, 제1·2차 음향 정합층(2)(3)과 압전체(1)의 곡률(R)과 일치시킬 수 있게 되므로 음향 정합층(2)(3)의 형성이 용이하여 이미지(image)의 측 방향 해상도를 향상시킬 수 있게 된다.FIG. 2 is an enlarged view of the main part of the present invention, and the acoustic matching layer 2 can be matched with the curvature R of the first and second acoustic matching layers 2 and 3 and the piezoelectric body 1. (3) can be easily formed to improve the lateral resolution of the image.

그리고 압전체(1)를 각각의 요소로 분리하기 위해 절단기(Dicing Saw)로 절단할 때 실제 폭 방향의 초음파 집속점에서부터 먼 거리에 집속되도록 압전체(1)의 곡률이 형성되어 있고 여기서 발생되는 집속거리의 불일치를 인체의 음속(Cw)에 비해 음속(Cm)이 작은 음향렌즈(4)에서 폭 방향으로 굴절에 의한 2중 포커싱(focusing)으로 초음파 집속초점을 맞추게 되므로 집속거리를 원하는 위치로 맞출 수 있게 된다.In addition, the curvature of the piezoelectric body 1 is formed so as to focus at a distance from the ultrasonic focusing point in the actual width direction when cutting the piezoelectric body 1 by dicing saw to separate the elements into individual elements. The mismatch of the ultrasonic focusing is achieved by double focusing by refraction in the width direction in the acoustic lens 4, which has a smaller sound velocity (Cm) than the sound velocity (Cw) of the human body. Will be.

이렇게 하여 압전체(1)의 곡률을 작게 할 수 있어서 절단깊이가 낮게 유지되므로 절단날과 압전체가 절단과정에서 파손되는 것을 방지할 수 있게 된다.In this way, the curvature of the piezoelectric body 1 can be made small, so that the cutting depth is kept low, so that the cutting blade and the piezoelectric body can be prevented from being broken during the cutting process.

또한, 음향렌즈(4)에 의한 집속방식으로부터 발생되는 감도 저하문제도 압전체(1)의 곡률에 의한 기계적 집속방식을 유지하기 때문에 음향 정합층 형성으로 인한 이득과 함께 고감도 변환기를 제작할 수 있게 되는 것이다.In addition, the problem of sensitivity deterioration caused by the focusing method by the acoustic lens 4 also maintains the mechanical focusing method due to the curvature of the piezoelectric body 1, so that a high-sensitivity converter can be manufactured with the gain due to the formation of the acoustic matching layer. .

이상과 같이 본 발명은 초음파 진단기용 변환기에서 폭 방향으로의 집속방식을 2중 포커싱으로 초음파 집속초점을 맞출 수 있게 함으로써 제작공정의 편의성과 측 방향 해상도가 향상된 고감도의 초음파 변환기를 얻을 수 있는 효과가 있다.As described above, the present invention has the effect of obtaining a high-sensitivity ultrasonic transducer with improved convenience and lateral resolution of the manufacturing process by allowing the ultrasound focusing apparatus to focus the ultrasonic focusing method in the focusing direction in the width direction by double focusing. have.

Claims (1)

의료용 초음파 진단기 초음파 변환기에 있어서, 압전체(1)의 곡률(R)과 제1·2차 음향 정합층(2)(3)의 곡률(R)이 일치되게 설치하고, 제2차 음향 정합층(3)위에 인체의 음속(Cw)에 비해 음속(Cm)의 작은 음향렌즈(4)를 설치하여 폭 방향으로 굴절에 의한 2중 포커싱으로 초음파 집속초점을 맞출 수 있게 한 의료용 초음파 변환기의 초음파 집속장치.In the ultrasonic ultrasound transducer for medical use, the curvature R of the piezoelectric body 1 and the curvature R of the first and the second acoustic matching layers 2 and 3 are provided to coincide, and the second acoustic matching layer ( 3) Ultrasonic focusing device of medical ultrasonic transducer which has focused on ultrasonic focusing by double focusing by refraction in width direction by installing small acoustic lens 4 of sound velocity (Cm) compared to sound velocity (Cw) of human body .
KR1019970047763A 1997-09-13 1997-09-13 Ultrasonic focusing apparatus of ultrasonic converter for medical KR100242625B1 (en)

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KR100419806B1 (en) * 2001-12-31 2004-02-21 주식회사 메디슨 Synthetic aperture focusing method for ultrasound imaging based on planar waves
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