What Is a Blood Oxygen Level?

The blood oxygen level depends on functional magnetic resonance imaging, which uses the change of local tissue T2 caused by the change in the ratio of oxygenated hemoglobin to deoxyhemoglobin in the local blood in the brain active area, so that the local activity function of brain tissue can be reflected on the T2 weighted image An MR imaging technique that can be used to study cortical activity in the brain. It is the most important technology in fMRI proposed by Ogawa et al. At present, it has become a powerful technical means for studying brain function. Compared to traditional positron emission tomography (PET) and other brain imaging methods, BOLD-fMRI uses the internal blood oxygen concentration change of the human body as a natural contrast agent for imaging, which can provide sufficiently high spatial and temporal resolution.