Methodological Study of Synaptic Plasticity Imaging With Diffusion MRI
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 35
- 试验地点
- 2
- 主要终点
- Assessment of synaptic plasticity using diffusion decline MRI
研究概览
简要总结
Diffusion MRI employed in functional imaging has the potential to probe directly brain activation instead of blood changes like the BOLD technique. The researchers investigated these rapid synaptic plasticity changes with visual activation followed by BOLD and diffusion functional MRI as well as anatomical (venography, tractography by diffusion) features in young and aged subjects.
详细描述
This study is devoted to explore brain plasticity by 2 modes of diffusion weighted imaging (DWI) of the brain :
- functional imaging using DWI and BOLD
- anatomical studies using DWI Theses DWI exams use high b-factor to sample tissue microstructure/metabolism. To correlated these DWI changes with anatomical ones, we used anatomical imaging like T1 maps and susceptibility-based maps.
First, the relatively new technique of diffusion functional magnetic Resonance (DfMRI) was explored to obtain activation of brain following visual stimulations. These modality was compared to BOLD and anatomical venography.
The DWI exams for anatomical (tractography) used both high angular resolution directional diffusion encoding (18 directions) and high b-values (as high as b=12 000 s/mm²) to obtain precise knowledge about tissue microstructure.
Study was approved by the National French Institute of Health and by french organism for biomedical studies (AFFSAPS). Study involve 35 subjects, with 5 additional subjects for eventual rejection because of ineligibility criterion, and compare 15 young (20-30 years) to aged healthy people (60-80 years).
研究设计
- 研究类型
- Observational
- 观察模型
- Case Crossover
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 20 Years 至 80 Years（Adult, Older Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •ages 20-30 years
- •60-80 years
排除标准
- •psychological or organic trouble
结局指标
主要结局
Assessment of synaptic plasticity using diffusion decline MRI
时间窗: To a maximum of 30 days
Diffusion decline imaging involves acquiring diffusion-weighted images (S image) by incrementing the b-factor (or diffusion weighting factor) over the course of several measurements; One measurement is taken for b = 0 s/mm² and provides image S0. This signal is obtained for each pixel of the S image, divided by the S0 image, producing an S/S0 image weighted by diffusion.
次要结局
未报告次要终点