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相关概念视频

Computed Tomography01:10

Computed Tomography

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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...

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Updated: May 13, 2026

Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method
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Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method

Published on: September 3, 2021

区域适应式零减法成像使用通用一致性因子用于一致的平面波组合.

Yijun Xu1, Yaoting Yue2, Hao Wang1

  • 1Academy for Engineering and Technology, Fudan University, Shanghai, China.

Ultrasonic imaging
|March 3, 2026
PubMed
概括
此摘要是机器生成的。

区域适应式零减法成像 (raNSI) 通过调整直流偏移来增强超快超声图像. 这种新的方法可以提高对比度,分辨率和斑点质量,而不会损害图像完整性.

关键词:
适应式光束成型 适应式光束成型一致的平面波浪复合.一般化的一致性因素.零减法成像 图像处理 零减法成像超声波成像的成像方法

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科学领域:

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

背景情况:

  • 连贯平面波组合 (CPWC) 是超快超声波的标准,但由于不聚焦的光束,其图像质量受到限制.
  • 零减去成像 (NSI) 提供了改进,但由于固定的直流偏移,在对比度,分辨率和斑点质量之间面临着权衡.

研究的目的:

  • 引入区域适应式零减法成像 (raNSI),以克服NSI中固定偏移的局限性.
  • 为了提高超快超声波成像中的图像对比度,分辨率和斑点质量.

主要方法:

  • 使用修改后的通用连贯因子 (GCF) 来识别不同的图像区域.
  • 应用了特定区域的DC偏移,并采用了基于社区统计的清洁 (NSBC) 来完善偏移选择.
  • 使用模拟,实验幻影和体内数据集验证的raNSI.

主要成果:

  • 与NSI相比,raNSI显著提高了57.94dB的对比率 (CR),0.19的斑点信号噪声比率 (sSNR),0.0327的对比噪声比率 (gCNR).
  • 实现了6.9%的侧面分辨率增强,同时保留了斑点图案,由科尔莫戈罗夫-斯米尔诺夫测试证实.
  • 证明了将所需的平面波数减少五倍的潜力.

结论:

  • raNSI有效地平衡高分辨率和对比度,同时保持超快超声波中的斑点图案完整性.
  • 拟议的方法与传统的NSI相比,提供了显著的进步,允许更高质量的成像,潜在的数据采集量更少.