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STUDY ON THE IMPROVEMENT OF IMAGE DEGRADATION FOR ULTRASONIC ECHOGRAPHIC IMAGE BY USING HIGHER ORDER HARMONICS

高次谐波改善超声超声图像劣化的研究

基本信息

批准号：
17500338
负责人：
AKIYAMA Iwaki
金额：
$ 2.31万
依托单位：
Shonan Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17500338/
关键词：
SPECKLE ACOUSTIC NONLINEARITY SECONDARY WAVES ANNULAR TYPE TRANSDUCER DUAL-FREQUENCY DRIVE PZT-PVDF BROADBAND IMAGING SYSTEMS MECHANICAL SECTOR ULTRASONIC DIANOGSTIC EQUIPMENT 二周波アニュラ型振動子二周波積層振動子広帯域化 PZT 非線形音響メカニカルセクタ型水槽実験

项目摘要

This study concentrates on the improvement of image degradation of ultrasonic echographic images by using higher order harmonics which are generated while ultrasound waves propagate through the biological tissues., Since image degradation caused by speckle patterns in the echographic image has been a problem, it is an important task to reduce these patterns to obtain higher quality images. In order to detect the higher harmonic components contained in the echo signals efficiently, a specialized transducer for broadband reception, besides the transmitting transducer is necessary. By constructing a mechanical sector scanner of an ultrasonic diagnosis system using such a PZT-PVDF two-layered ultrasonic probe, an ultra-broadband ultrasonic imaging system capable of a real time imaging was prototyped. Thus, the real time imaging was carried out by obtaining the echo signal from phantoms using a PZT-PVDF two-layered ultrasonic mechanical sector probe, and the effectiveness of its higher harmonic components from the fundamental to the fourth harmonic was confirmed in speckle reduction. Then we prototyped the novel transducer which transmits ultrasonic pulse of dual-frequency and receives multi-frequency echoes from the biological tissues. When the ultrasonic pulse off and 4f_0 are transmitted into the biological tissues, 2f_0, 3f_0, and 5f_0 components are generated as the secondary waves. We have prototyped the PZT disk of 7 mm in diameter coaxially arranged in the PZT ring of 17 mm in outer diameter The ring and circular transducers transmit the pulses of 2 and 8 MHz, respectively. It was confirmed that this transducer formed the ultrasonic beams of 4, 6 and 10 MHz as well as the beams of 2 and 8 MHz in degassed water. Then the experiments of imaging the agar-gel phantom and pork meat were carried out by mechanical scanning. As a result, we also confirmed the improvement of image degradation by reducing the speckle noise.

本研究集中于利用超声波在生物组织中传播时产生的高次谐波来改善超声回波图像的图像退化。由于回波描记图像中由散斑图案引起的图像劣化一直是一个问题，因此减少这些图案以获得更高质量的图像是一个重要的任务。为了有效地检测回波信号中包含的高次谐波分量，除了发射换能器之外，还需要用于宽带接收的专用换能器。利用这种PZT-PVDF双层超声探头构建了超声诊断系统的机械扇形扫描器，实现了超宽带超声成像系统的真实的实时成像。因此，真实的时间成像是通过使用PZT-PVDF双层超声机械扇形探头从体模获得回波信号来进行的，并且证实了其从基波到四次谐波的高次谐波分量在散斑抑制中的有效性。在此基础上，研制了发射双频超声脉冲、接收生物组织多频回波的新型换能器。当超声波脉冲off和4f_0被发送到生物组织中时，产生2f_0、3f_0和5f_0分量作为二次波。我们已经制作了直径为7 mm的PZT盘，同轴地布置在外径为17 mm的PZT环中。环形和圆形换能器分别发射2 MHz和8 MHz的脉冲。确认该换能器在脱气水中形成4、6和10 MHz的超声波束以及2和8 MHz的束。然后对琼脂模体和猪肉进行了机械扫描成像实验。结果，我们还确认了通过减少斑点噪声来改善图像劣化。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Nonlinear Multibeam Ultrasonic Imaging-Simultaneous Trans-mission of Ultrasonic Waves of Two Frequencies-

非线性多波束超声波成像-同时传输两种频率的超声波-

DOI：
发表时间：
2007
期刊：
影响因子：
0
作者：
秋山いわき;斎藤繁実;大矢晃久;秋山いわき;Iwaki Akiyama;秋山いわき;秋山いわき;吉住夏輝;Natsuki Yoshizumi;吉住夏輝;Natsuki Yoshizumi;吉住夏輝;吉住夏輝;Natsuki Yoshizumi;吉住夏輝;Natsuki Yoshizumi;Iwaki Akiyama
通讯作者：
Iwaki Akiyama

Ultra-broadband Ultrasonic Imaging-Generation of Harmonic Beam by Transducer Divided into Bi-frequency-

超宽带超声成像——双频换能器产生谐波束

DOI：
发表时间：
2006
期刊：
影响因子：
0
作者：
秋山いわき;斎藤繁実;大矢晃久;秋山いわき;Iwaki Akiyama;秋山いわき;秋山いわき;吉住夏輝;Natsuki Yoshizumi;吉住夏輝;Natsuki Yoshizumi;吉住夏輝;吉住夏輝;Natsuki Yoshizumi;吉住夏輝;Natsuki Yoshizumi;Iwaki Akiyama;Iwaki Akiyama;秋山いわき;Iwaki Akiyama;Iwaki Akiyama;Iwaki Akiyama;Iwaki Akiyama;Iwaki Akiyama;秋山いわき;Iwaki Akiyama;秋山いわき;Iwaki Akiyama
通讯作者：
Iwaki Akiyama

Development of an ultra-broadband ultrasonic imaging system: prototype mechanical sector device.