JP4222940B2 - トランスデューサの周波数アポダイゼーション及び振幅アポダイゼーション - Google Patents
トランスデューサの周波数アポダイゼーション及び振幅アポダイゼーション Download PDFInfo
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Classifications
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- 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
-
- 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
- A61B8/14—Echo-tomography
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
Description
ピッチ=pi=(yi/Σyi)AW
yi=(a/(σ(SQRT(2π))e**((−1/2(xi−μ)/σ2))
ここで、a=加重定数、σ=標準偏差、μ=平均、及びAW=結晶のアパーチャ幅である。実施形態の一例では、a=1、σ=4、μ=0、及びAW=14mmである。但し、他の値をこれらの式と共に用いてよい。
ピッチ=pi=(yi/Σyi)AW
yi=α+(1−α)cos(2πxi/a)
(−AW/2≦xi≦AW/2)
ここで、α=ハニング係数、a=加重定数、及びAW=結晶のアパーチャ幅である。実施形態の一例では、α=0.5、a=1、及びAW=14mmである。但し、他の値をこれらの式と共に用いてよい。参照として、yは複合用切断部ピッチであり、xは仰角方向アパーチャに関係する。例えば、xは、最小ピッチが最大ピッチの40%だけ小さくなるように選択してよい。周波数アポダイゼーションについては、ガウス分布又はハニング分布による変化は以下のように変形した式で表わされる。ガウス分布については、
yi=1−(a/(σ(SQRT(2π))e**((−1/2(xi−μ)/σ2))
及びハニング分布については、
yi=1−(α+(1−α)cos(2πxi/a))
である。
30 同軸ケーブル
40 表示器
50 被検体
110 超音波トランスデューサ・アレイ
112 超音波トランスデューサ素子
114 ハウジング
116 導線
118 接地箔
120 絶縁基材層
122 圧電層
124、126 音響マッチング層
130 基材
132 前面
134 背面
136 金属化層
138 分離切断部
140 背面電極
142 前面電極
144 包囲端部
146 担体フィルム
148 複合用切断部
149 奥側端部
180 ポリマー・バッキング材
500、700 基材中間部
505 ピッチ変化
510、710 基材端辺部
520、521、720 基材中間部から基材端辺部へ向かう方向
601 支柱
604 切り溝(切断部幅)
605、607 切断部の後端
606 切断部の前端
608 支柱幅
609 ピッチ
Claims (6)
- 圧電材料と、
前記圧電材料で形成されている複数の支柱であって、各支柱が可変の支柱幅を有し、隣接する支柱と切り溝により隔てられている前記複数の支柱と、
前記圧電材料に位置する中央部であって、前記圧電材料の当該中央部の支柱の支柱幅が当該中央部から遠い支柱の支柱幅よりも狭くなるように隔設されている、中央部と、を備えた超音波トランスデューサ装置であって、
前記中央部の支柱と前記中央部から遠い支柱の間に配置される複数の支柱の支柱幅が前記中央部から遠ざかるにつれて次第に広くなるようにして形成されており、前記中央部の支柱と前記中央部から遠い支柱の間に配置される前記複数の支柱の共振周波数が前記中央部から遠ざかるにつれて次第に低くなるようにして形成されており、
前記中央部の支柱と前記中央部から遠い支柱の間に配置される複数の支柱の音響インピーダンスが前記中央部から遠ざかるにつれて次第に大きくなるようにして形成されており、
前記各支柱の支柱幅とこれ隣接する切り溝の幅により規定されるピッチは、アポダイゼーション関数に従って変化するように決定される、
超音波トランスデューサ装置。 - 前記アポダイゼーション関数はガウス関数であり、前記ガウス関数のガウス分布は、式
ピッチ=pi=(yi/Σyi)AW
により定義され、ここで、
yi=1−(a/(σ(SQRT(2π))e**((−1/2(xi−μ)/σ2))
a=加重定数、σ=標準偏差、μ=平均、及びAW=結晶のアパーチャ幅である、請求項1に記載の装置。 - 前記アポダイゼーション関数はハニング関数であり、前記ハニング関数のハニング分布は、式
ピッチ=pi=(yi/Σyi)AW
により定義され、ここで、
yi=1−(α+(1−α)cos(2πxi/a))
(−AW/2≦xi≦AW/2)
α=ハニング係数、a=加重定数、及びAW=結晶のアパーチャ幅である、請求項1に記載の装置。 - 前記切り溝の幅は一定である、請求項1乃至3のいずれかに記載の装置。
- 前記切り溝の幅は変化する、請求項1乃至3のいずれかに記載の装置。
- 前記複数の支柱の各々の間に一体形成されているエポキシをさらに含んでいる請求項1に記載の装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/954,563 US6726631B2 (en) | 2000-08-08 | 2001-09-17 | Frequency and amplitude apodization of transducers |
PCT/US2002/024299 WO2003024625A1 (en) | 2001-09-17 | 2002-07-31 | Frequency and amplitude apodization of transducers |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005502437A JP2005502437A (ja) | 2005-01-27 |
JP4222940B2 true JP4222940B2 (ja) | 2009-02-12 |
Family
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003528314A Expired - Fee Related JP4222940B2 (ja) | 2001-09-17 | 2002-07-31 | トランスデューサの周波数アポダイゼーション及び振幅アポダイゼーション |
Country Status (6)
Country | Link |
---|---|
US (1) | US6726631B2 (ja) |
EP (1) | EP1429870B1 (ja) |
JP (1) | JP4222940B2 (ja) |
CN (1) | CN100398224C (ja) |
DE (1) | DE60238206D1 (ja) |
WO (1) | WO2003024625A1 (ja) |
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US11495730B2 (en) * | 2019-12-02 | 2022-11-08 | GE Precision Healthcare LLC | Methods and systems for wafer scale transducer array fabrication |
CN111842095B (zh) * | 2020-06-24 | 2021-07-27 | 深圳先进技术研究院 | 人工结构超声换能器以及超声装置 |
CN113171117B (zh) * | 2021-03-29 | 2022-12-23 | 聚融医疗科技(杭州)有限公司 | 一种在使用过程中阵元间距可调探头及其制备方法 |
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- 2002-07-31 WO PCT/US2002/024299 patent/WO2003024625A1/en active Application Filing
- 2002-07-31 DE DE60238206T patent/DE60238206D1/de not_active Expired - Lifetime
- 2002-07-31 JP JP2003528314A patent/JP4222940B2/ja not_active Expired - Fee Related
- 2002-07-31 EP EP02765910A patent/EP1429870B1/en not_active Expired - Lifetime
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EP1429870B1 (en) | 2010-11-03 |
US6726631B2 (en) | 2004-04-27 |
CN1568230A (zh) | 2005-01-19 |
JP2005502437A (ja) | 2005-01-27 |
US20020042577A1 (en) | 2002-04-11 |
CN100398224C (zh) | 2008-07-02 |
DE60238206D1 (de) | 2010-12-16 |
WO2003024625A1 (en) | 2003-03-27 |
EP1429870A1 (en) | 2004-06-23 |
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