相关实验视频
Updated: Jun 9, 2025
08:51
Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
Published on: February 19, 2021
8.9K
磁敏度和R2*映射的生物物理对比源:一个联合的7特斯拉,质谱和电子磁共振研究
Fábio Seiji Otsuka1, Maria Concepción Garcia Otaduy2, Roberta Diehl Rodriguez2
1InBrain, Departamento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo USP, Avenida Bandeirantes 3900, Vila Monte Alegre, Ribeirão Preto, São Paulo CEP 14040-901, Brazil.
NeuroImage
|October 21, 2024
概括
定量核磁共振技术,如R2*映射和定量敏感度映射 (QSM),与特定区域的大脑铁和费里水平的相关性很好. 这些发现提高了对神经系统疾病中MRI对比生成的理解.
科学领域:
- 神经成像是一种神经成像.
- 生物化学 生物化学
- 医学物理 医学物理
背景情况:
- 铁在大脑中是丰富的,在神经系统疾病中是高的.
- 定量核磁共振 (qMRI) 技术,如R2*映射和定量敏感性映射 (QSM) 在体内评估大脑铁.
- 以前的研究将总铁与MRI相关联,但ferritin与qMRI的关系尚不清楚.
研究的目的:
- 系统地分析费里水平与qMRI参数 (R2*和QSM) 之间的关系.
- 为了比较不同大脑区域的总铁和铁素与R2*和QSM的相关性.
- 调查实地定量MRI用于评估大脑铁的实用性.
主要方法:
- 在死亡前24小时内对15名受试者进行7特斯拉的死后定量核磁共振.
- 感应合等离子体质谱 (ICP-MS) 用于总铁的量化.
- 电子偏磁共振 (EPR) 用于费里丁的量化.
- 在8个灰色物质结构中,MRI参数 (R2*,QSM) 和生化测量 (铁,费里丁) 之间的相关性分析.
主要成果:
- 在基底和红核中,R2*和QSM与铁 (R2>0.7) 和费里丁 (R2>0.6) 有很强的相关性.
- 在皮质区域和海马体中,相关性较弱.
- 黑色物质仅与铁相关 (R2>0.5),而不是费里.
- 定量敏感性映射 (QSM) 显示出比R2*映射更强的相关性.
结论:
- 这项研究在in-situMRI设置中建立了R2*,QSM,总铁和费里丁之间的定量相关性.
- 这些发现有助于理解不同分子形式的铁如何对MRI对比度有所贡献.
- 这些结果支持使用qMRI进行神经疾病中大脑铁代谢的非侵入性评估.
相关概念视频
01:24Magnetic Resonance Imaging
5.0K
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...
5.0K
01:25Applications Of NMR In Biology
3.7K
Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
3.7K
01:05Atomic Nuclei: Magnetic Resonance
636
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
636
01:33Proteomics
7.2K
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
7.2K