没有对比的动态灵敏度对比使用鼻状和球状氧化挑战
Chau Vu1, Jian Shen1, Clio Gonzalez-Zacarias2
1Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA.
NMR in biomedicine
|February 1, 2024
概括
基于脱氧化的动态灵敏度对比 (dDSC) MRI提供了一种无加多的方法来测量大脑输液. 三次氧气挑战显示出可靠的脑血量估计,尽管脑血流和平均传输时间因刺激而异.
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.
- 医学物理 医学物理
背景情况:
- 动态灵敏度对比 (DSC) MRI通常依赖于加多对比剂.
- 基于脱氧化的DSC (dDSC) MRI利用来自呼吸挑战的内源对比,提供无加多的替代品.
- 评估大脑输液对于诊断各种神经疾病至关重要.
研究的目的:
- 为了比较三种不同的基于氧气的呼吸挑战对dDSCMRI的可靠性.
- 为了评估从这些dDSC方法中得出的输液估计 (CBF,CBV,MTT) 的准确性.
- 为了评估与传统的加多增强的DSCMRI的交叉模式相关性.
主要方法:
- 十名健康的志愿者接受了dDSCMRI,使用三个不同的呼吸挑战:脱,再和SineO2.2.
- 计算了脑输液参数,包括脑血流 (CBF),脑血量 (CBV) 和平均传输时间 (MTT).
- 在时间域 (脱,再和) 和频率域 (SineO2) 中应用了标志物动力学建模.
主要成果:
- 在所有三种dDSC方法中发现CBV估计的高相关性和一致性.
- 对MTT和CBF的估计显示了根据所使用的特定低氧刺激的变化.
- 与加多DSC的交叉模式相关性是中度的,特别是对于MTT,但与其他输液参考值相比较.
结论:
- 氧气呼吸挑战是可行的和可靠的使用dDSCMRI测量脑 perfusion.
- 虽然CBV估计是一致的,但CBF和MTT测量是刺激依赖的.
- 需要进一步的研究来验证dDSCMRI在中风,瘤和神经退行性疾病中的临床应用.
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