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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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相关实验视频

Updated: Jun 28, 2025

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
09:02

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Published on: January 31, 2025

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使用基于频率转移信封的全波形逆转为超声计算机断层扫描的全球相关性规范.

Yun Wu1, Weicheng Yan1, Zhaohui Liu1

  • 1Department of Biomedical Engineering, School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

Physics in medicine and biology
|April 9, 2024
PubMed
概括

这项研究引入了一种新的超声波计算机断层扫描 (USCT) 方法,即基于频率转移外的全球相关性规范 (FSEGCN),以改善声速成像. 在没有低频数据的情况下,FSEGCN成功地重建了准确的图像,克服了传统的全波形反转 (FWI) 的局限性.

关键词:
在信封封面上频率转移的频率转移是如何发生的全球相关性规范是全球相关性规范.超声波计算机断层扫描 (CT) 是一种计算机断层扫描.

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科学领域:

  • 医疗成像医学成像
  • 生物医学工程 生物医学工程
  • 声学 声学 在声学方面

背景情况:

  • 超声波计算机断层扫描 (USCT) 能够进行定量组织声速测量.
  • 全波形逆转 (FWI) 可以重建高分辨率的音速图像,但容易跳过周期,导致局部最小值.
  • 由于相差超过半个周期,通常使用低频数据避免循环跳转,这种数据通常无法在实际的成像系统中获得.

研究的目的:

  • 开发一种用于USCT中准确的声速成像的新方法,可以绕过跳转周期的问题,而不依赖低频信息.
  • 评估拟议方法的性能与现有技术相比,如FWI,信封逆转 (EI),全球相关性规范 (GCN) 和基于信封的全球相关性规范 (EGCN).

主要方法:

  • 提出了一种基于频率转移包的全球相关性规范 (FSEGCN) 技术.
  • 利用人工低频源波段来生成用于反转的合成数据.
  • 与FSEGCN与FWI,EI,GCN和EGCN进行比较,使用同心圆幻影,人头和小牛幻影,特别是在缺乏原始低频信息的场景中.

主要成果:

  • 在没有低频信息的情况下,FSEGCN成功地重建了接近确切模型的声速图像.
  • 由于缺乏低频数据,传统方法 (FWI,EI,GCN,EGCN) 无法实现准确的重建.
  • 人工源波的应用在人类头部和小腿幻影中减少了图像文物,并提高了重建的稳定性.

结论:

  • FSEGCN为USCT中精确的声速成像提供了强大的解决方案,特别是当低频数据不可用时.
  • 使用人工源波段是一种可行的策略,以减轻文物并提高USCT重建的可靠性.
  • 这种方法通过克服传统的全波形反转的关键限制,推进了定量超声波成像.