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相关概念视频

Differential Leveling01:12

Differential Leveling

908
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
908

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相关实验视频

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在使用零减法成像的大距离阵列上减轻格叶的缓解.

Mick Gardner1, Rita J Miller1, Michael L Oelze1

  • 1Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 306 N Wright St, Urbana, IL, 61801, USA.

Ultrasonics
|March 26, 2024
PubMed
概括

零减去成像 (NSI) 显著减少了超声波成像中的格子叶,改善了图像质量,并为腹部成像等应用程序提供了更广泛的视野.

科学领域:

  • 医疗成像医学成像
  • 超声波技术 超声波技术 超声波技术
  • 信号处理 信号处理

背景情况:

  • 零减去成像 (NSI) 是一种新的光束成形技术.
  • NSI提供高空间分辨率和低计算成本.
  • NSI可以减轻格子叶,减少图像对比度的工件.

研究的目的:

  • 为了研究NSI的可行性,使用大距离,宽视野阵列.
  • 在各种实验条件下,通过NSI量化格叶缩小.
  • 评估NSI对超声波成像中的图像质量指标的影响.

主要方法:

  • 实验使用NSI和延迟和总和 (DAS) 束形进行.
  • 格叶的缩小与阵列距离,直流偏移和f数进行了测量.
  • 测试涉及幻象中的电线和对比目标,在子肝脏上的体内验证.

主要成果:

  • 与DAS相比,NSI将格叶的亮度降低了多达45dB.
  • 在格叶区域的通用对比比 (gCNR) 从0.60提高到0.08.
  • 无声区域的ChNR从0.09增加到0.15在5波长阵列中.
  • 斑点质量保持在与DAS.类似的水平.
关键词:
这就是"apodization"的意思.梁成型 梁成型 梁成型格的叶片 格的叶片零减法成像 图像 零减法成像一个稀疏的数组阵列.的 f-号码.

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结论:

  • NSI有效地减少了网格叶子,即使是大型音调阵列.
  • 这种缩小允许更广泛的视野,而不会影响图像质量.
  • NSI显示出显著的潜力来增强超声波成像,特别是对于腹部应用.