Studies have showed that ADC can represent brain edema after TBI. Apparent diffusion coefficient (ADC) is used to represent the range and velocity of the diffusion movement of water molecules in different directions in DWI. 5 Diffuse-weighted imaging (DWI) can show water molecule movement noninvasively at cell level. Recently, with the rapid development of imaging techniques, in comparison with conventional MRI, functional MRI (fMRI) has been shown to provide, in addition to the morphology information, metabolism and physiological functional information in TBI. 4 Therefore, early diagnosis and finding out of the mechanism of cerebral edema after TBI can provide new theoretical basis for treatment of TBI. 3 Secondary brain edema is considered to be an initiating factor in secondary brain injury. 2 Research has shown that secondary brain injury has become a major factor that affects the prognosis and outcome of the TBI patients. 1 After primary brain injury occurs, it is followed by a secondary brain injury cascade. TBI can bring serious health and economic burden to society and individuals. Traumatic brain injury (TBI) is a serious public health problem, which has high mortality and disability rate.
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