- Below normal: 90-94%. Your blood oxygen level is lower than normal. Environmental factors such as altitude or physical conditions like asthma can cause lower SpO2 levels. - Low: Less than 90%. If your blood oxygen level is low, you may experience more severe symptoms like shortness of...
当大脑皮层受到生理刺激,局部神经元活动增加使其代谢率增高,局部血管扩张,血流量增加,但在增加程度上有明显差异,局部组织中氧的供应量超过代谢的耗氧量,HbO2相对增加,顺磁性的dHb相对减少,表现为该脑区的T2*MR信号强度相对增加。临床应用:fMRI研究已取得了很大的成绩,目前的研究已不仅停留在用fMRI技术来显示神经活动...
(also termed resistance vessels) and increases both blood volume and blood flow without affecting the metabolic rate of oxygen.4,5When imaged with BOLD MRI, CO2increases MRI signal and CVR can be quantified as percent MR signal change per unit stimuli (Fig 1). Although the changes quantified ...
aHe looked for the girl whose heart he knew,but whose face he didn't,the girl with the rose 他正在寻找心脏他知道,但面孔他没有,女孩与上升的女孩[translate] ablood oxygen level–dependent 血液氧气水平依赖[translate]
The blood in your body delivers oxygen to all of your cells. When you breathe and draw fresh oxygen into yourlungs,red blood cellsbind with the oxygen and carry it through your bloodstream. On a cellular level, oxygen helps replace cells that wear out, supplies you with energy, supports yo...
The difference between SaO2 and SpO2 may exceed three percentage points when oxygen is insufficient [353]. In a normal scenario, the value of SaO2 of an adult is not less than 90% [354], some scholars define SpO2 lower than 90% is considered as hypoxemia [355]. Hypoxia is a state in...
Others, such as mountain climbers or airline passengers, may need only additional oxygen provided by oxygen masks until they reach lower levels where oxygen concentrations are closer to the normal levels (about 21%) in the atmosphere. Care must be used when giving oxygen, as it can be toxic ...
variability in blood oxygen level dependent (bold) signal in patients with stroke-induced and primary progressive aphasia文献 热度: 肾的血氧水平依赖功能磁共振成像 热度: BOLD-fMRI脑功能成像 热度: 相关推荐 原理: 由于血液中Hb在与氧结合成HbO2时磁矩和顺磁性均下降,而去氧后变成dHb,具有顺磁效应...
blood oxygen-level dependent signal选择语言:从 到 翻译结果1翻译结果2 翻译结果3翻译结果4翻译结果5 翻译结果1复制译文编辑译文朗读译文返回顶部 血液含氧水平依赖(粗体)信号 翻译结果2复制译文编辑译文朗读译文返回顶部 血液氧气水平受养人 ( 粗体 ) 信号 翻译结果3复制译文编辑译文朗读译文返回顶部 血液氧水平取决...
Blood Oxygen Level-DependentBOLD BOLD imaging is a version of magnetic resonance imaging that depends on the different magnetic properties of oxygenated versus deoxygenated hemoglobin and thus, indirectly, on variations in...doi:10.1007/978-0-387-79948-3_10John Whyte...