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相关概念视频

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
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Joints01:26

Joints

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Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...
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Introduction to Joints00:58

Introduction to Joints

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The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no...
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相关实验视频

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Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques
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心脏MR指纹在0.55T使用深度图像之前的联合T1,T2,和M0映射.

Zhongnan Liu1, Zexuan Liu2, Imran Rashid3,4

  • 1Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA.

Journal of magnetic resonance imaging : JMRI
|January 22, 2026
PubMed
概括

在0.55T的心脏MRI是可行的,使用MR指纹 (MRF) 与深度图像前重建. 这种技术有效地降低了噪音,提高了图像质量,并使心脏中准确的T1和T2映射成为可能.

关键词:
在MR指纹采集.T1映射 T1映射 T1映射 T1映射T2映射的映射 T2映射的映射的映射这是心脏病,心脏病.深度学习是一种深度学习.这是一个低地低地.

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科学领域:

  • 心血管成像 - 心血管成像
  • 医学物理 医学物理
  • 生物医学工程 生物医学工程

背景情况:

  • 0.55T MRI 系统为更广泛地获得心脏磁共振成像提供了机会.
  • 探索MR指纹 (MRF) 等新技术对于优化低场MRI性能至关重要.

研究的目的:

  • 为了评估心脏MR指纹 (MRF) 在0.55T的可行性.
  • 评估深度图像先前 (DIP) 重建在缓解噪声的有效性,为0.55T心脏MRF.

主要方法:

  • 幻影和前性体内研究使用0.55TMRI系统进行.
  • 实施了MR指纹 (MRF) 并与传统的修改的Look-Locker (MOLLI) 和T2-准备的平衡稳定状态自由前行 (T2-bSSFP) 序列进行了比较.
  • 重建方法包括低级技术 (SLLR-MRF) 和深度图像先前方法 (DIP-MRF).

主要成果:

  • DIP-MRF显示了与传统方法相比的T1映射精度和显著较低的T2值.
  • 图像质量评分在DIP-MRF (T1: 3.8,T2: 4.1) 中最高,其次是传统映射 (T1: 3.4,T2: 3.9),SLLR-MRF (T1: 2.3,T2: 2.9) 中最低.
  • 与SLLR-MRF相比,DIP-MRF在T1和T2中实现了显著较低的心肌标准偏差.

结论:

  • 心脏MR指纹 (MRF) 在商用0.55T系统上是可行的.
  • 深度图像预先重建是通过有效地减少图像噪声,在0.55T处实现高质量的心脏MRF的关键因素.
  • 这一进步有望扩大低场心脏MRI的实用性.