Weighted Conical Type Limited-Diffraction-Beam Transducers for High-Resolution Ultrasound Imaging

用于高分辨率超声成像的加重锥形有限衍射光束换能器

• 批准号: 07650387
• 负责人: YAMADA Ken
• 金额: $ 1.41万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650387/
• 关键词: ultrasound transducer; piezocomposite; weighting; diagnostic ultrasound; Bessel beam; limited diffraction beams; high resolution; conical; トランスジューサ; コニカル形; 高解像度

The purpose of this research project is to develop a new type of limited-diffraction-beam transducer which has a conical radiation surface for high-resolution ultrasound imaging. The results obtained in this project are as follows :(1)Discretely weighted structures have been presented that will facilitate the fabrication of weighted conical transducers. Divided conical transducers composed of a segmented cone with discrete weighting can create sound fields almost the same as those for the continuously weighted complete conical transducers.(2)A simple and practical method of realizing weighted conical transducers have been examined that uses apodisation on the vibration area by forming narrow electrode strips of a uniform width spreading radially on the transducer.(3)A weighted conical transducer has been fabricated using a piezoelectric composite with 1-3 connectivity that has the electromechanical coupling coefficient larger than that of a PVDF film. It has been shown that the large electromechanical coupling coefficient of the piezocomposite material increases the transducer sensitivity by 7 dB or more.(4)It has been demonstrated through preliminary experiments with B-mode imaging that high resolution is maintained over a large depth.

本研究旨在发展一种新型的有限绕射波束换能器，其辐射面为圆锥形，可用于高解析度的超音波成像。本研究取得的主要成果如下：（1）提出了离散加权结构，为加权圆锥换能器的制作提供了方便。由具有离散加权的分段圆锥组成的分开的圆锥换能器可以产生与连续加权的完整圆锥换能器几乎相同的声场。(2)A已经研究了实现加权锥形换能器的简单和实用的方法，该方法通过在换能器上形成均匀宽度的窄电极条而在振动区域上使用切趾。(3)A采用机电耦合系数大于PVDF膜的1-3连通度压电复合材料制作了加权圆锥换能器。已经表明，压电复合材料的大机电耦合系数使换能器灵敏度增加7 dB或更多。(4)It通过B模式成像的初步实验已经证明，在大深度上保持高分辨率。

项目成果

水野 隆: "パルス反射法による重み付けコニカル形トランスジューサの分解能評価" 日本音響学会講演論文集. 867-868 (1996)

Takashi Mizuno：“使用脉冲反射法评估加权锥形换能器的分辨率”日本声学学会会议记录 867-868 (1996)。

Ken Yamada: "LIMITED DIFFRACTION BEAM TRANSDUCER OF CONICAL TYPE WITH APODIZED VIBRATION AREA" 1996 IEEE Ultrasonics Symposium Proceedings. (未定). (1996)

Ken Yamada：“具有变迹振动区域的圆锥型有限衍射束换能器”1996 年 IEEE 超声波研讨会论文集（待定）。

T.Mizuno: "Piezocomposite Ultrasonic Transducer of Conical Type with Apodized Vibration Area." TECHNICAL REPORT OF IEICE. US96-40. 23-29 (1996)

T.Mizuno：“具有变迹振动区域的锥形压电复合超声波换能器。”

Takashi Koike: "Conical type ultrasonic transducer with apodised vibration area for generation of limited diffraction beams" Electronics Letters. 32. 2304-2305 (1996)

Takashi Koike：“具有变迹振动区域的锥形超声波换能器，用于生成有限的衍射束”《电子快报》。

Ken Yamada: "Quasi-nondiffracting beam of Hankel type produced by weighted conical Ultrasound Transducers" Electronics Letters. 30. 672-673 (1994)

Ken Yamada：“由加权锥形超声换能器产生的汉克尔型准非衍射光束”《电子快报》。