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相关概念视频

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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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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...
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相关实验视频

Updated: Jul 18, 2025

High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain
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High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain

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快速压缩感应3D辐射T1映射与不同的稀疏和低等级模型.

Antti Paajanen1, Matti Hanhela1, Nina Hänninen1

  • 1Department of Technical Physics, University of Eastern Finland, 70211 Kuopio, Finland.

Journal of imaging
|August 25, 2023
PubMed
概括

这项研究比较了用于3D辐射定量磁共振成像的压缩传感模型. 最好的模型结合了空间总变化和局部低等级规范化,以获得高质量的T1地图.

科学领域:

  • 医疗成像医学成像
  • 磁共振成像技术 磁共振成像技术
  • 图像重建 图像的重建

背景情况:

  • 压缩感应模型对于加速MRI采集至关重要.
  • 关于3D辐射定量MRI中稀疏和低级模型的比较性能知识有限.
  • T1放松时间映射对于各种诊断应用是必不可少的.

研究的目的:

  • 为了比较不同压缩传感规范化模型的性能,用于3D辐射T1映射.
  • 确定用于定量MRI重建的最佳压缩传感模型.
  • 为了评估重建质量,使用规范化根平均平方误差和结构相似度指数来评估重建质量.

主要方法:

  • 利用了3D辐射T1放松时间映射数据.
  • 比较总变化,低级别和休伯惩罚函数规范化方法.
  • 用模拟和ex vivo样本数据进行模型评估.
  • 使用GPU加速的初级-双重近接分割算法解决了大规模的压缩传感模型.

主要成果:

  • 结合空间总变化和局部低级规范化的模型表现出卓越的性能.
  • 一个包含空间和对比度总变化的模型也显示出了强的结果.
  • 重建时间差异很大,低级别的方法比较计算密集 (2-113分钟).
关键词:
T1放松放松的过程压缩感应传感器 压缩感应图像重建 图像重建定量磁共振成像技术的使用.规范化 规范化 规范化

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression

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相关实验视频

Last Updated: Jul 18, 2025

High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain
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High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain

Published on: May 10, 2012

12.9K
Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

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Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression
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Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression

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结论:

  • 建议将空间总变化和局部低等级规范化的组合用于3D辐射T1映射.
  • 图像重建性能受到成像对象的特征的显著影响.
  • 高效的GPU实现使高质量的定量MRI可行计算时间.