相关实验视频
Updated: Feb 13, 2026

10:05
In vivo 19F MRI for Cell Tracking
Published on: November 25, 2013
15.5K
死后间隔对未固定和固定猪大脑的定量MRI的影响:对活体MRI应用的含义
Lixian Wang1, Naoya Oishi1, Shin-Ichi Urayama1
1Human Brain Research Center, Graduate School of Medicine, Kyoto University, Kyoto Kyoto, Japan.
概括
死后间隔 (PMI) 显著影响猪大脑在24小时内T1放松时间. 虽然固定改变了定量MRI (qMRI) 值,但T1 PMI效应仍然可检测,为ex vivo研究提供了指导.
科学领域:
- 神经成像是一种神经成像.
- 生物物理学的生物物理.
- 法医科学 法医科学 法医科学
背景情况:
- 死后间隔 (PMI) 影响组织特性,影响定量MRI (qMRI) 信号.
- 了解这些变化对于解释ex vivo qMRI数据至关重要.
研究的目的:
- 系统地研究PMI对T1,T2和T2*放松时间的影响,在未固定和固定猪大脑中.
- 评估组织特征 (灰质与白质) 如何影响PMI依赖的qMRI信号变化.
- 评估组织固定对qMRI参数的影响以及PMI效应的检测能力.
主要方法:
- 在三个PMI窗口 (≈12,24,48小时) 扫描了12个猪大脑,它们处于未固定和固定状态.
- 使用相同的协议获得了定量T1,T2和T2*地图.
- 分析了PMI对灰质 (GM) 和白质 (WM) 放松时间的影响,以及固定诱导的变化和样本间的变化.
主要成果:
- 在未固定的大脑中,T1放松时间与24小时内GM和WM的PMI显著相关.
- T2放松时间与WM的PMI有反向相关性,而T2*没有显著的PMI关系.
- 固定改变了所有qMRI参数,增加了样本间的变异性,但保留了顺序T1-PMI关系.
结论:
- 死后间隔 (PMI) 对T1放松时间有最显著的影响.
- 组织固定对qMRI值产生重大影响,掩盖了一些PMI影响,但允许T1变化的排序检测.
- 这些发现为进行考虑PMI和固定性的ex vivo qMRI研究提供了实用见解.
更多相关视频
相关概念视频
Imaging Studies I: CT and MRI
921
Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
921
Radiological Investigation II: MRI and Ventilation Perfusion Scan
639
Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
639
Prediction Intervals
3.4K
The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y.
However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y.
3.4K
Confidence Intervals
10.8K
An unbiased point estimate is often insufficient to predict a population estimate, such as population mean or population proportion. In this scenario, a confidence interval is used. A confidence interval is an estimate similar to a sample proportion. However, unlike the point estimate which is a single value, the confidence interval contains a range of values. These values have lower and upper limits, known as confidence limits, and can be designated as L1 and L2, respectively.
A...
A...
10.8K
Improper Integrals: Infinite Intervals
118
An integral is classified as improper due to an infinite interval when at least one of its limits of integration extends to positive or negative infinity. In such cases, the region under the curve is unbounded, and standard techniques for evaluating definite integrals are not directly applicable. Instead, the improper integral is defined through a limiting process that allows one to determine whether the accumulated area remains finite despite the infinite domain.Application to Exponential...
118
Fixed Action Patterns
17.7K
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
17.7K

