There are four conventional parameters in MRI, which are t1, t2, tfi2 and DWI. MRI images of cerebral infarction can reflect the severity of the disease to a certain extent, and the parameters of the images in different periods are different, which can be mainly categorized into four different situations such as hyperacute, acute, subacute, and chronic phases. 1. Hyperacute phase: within 6 hours of the onset of the disease, the MRI DWI shows a high signal with limited diffusion, and there is no obvious signal change in t1, t2, tfi2. 2. Acute phase: within 6-72 hours of cerebral infarction, high signal is demonstrated on DWI, and t2 and tfi2 gradually begin to show significant signal, although the signal of t2 will be smaller than that of DWI. 3. Subacute phase:At this time, when observing the MRI, you can find a weakened signal on DWI, while t2 and tfi2 will appear high signal. 4. Chronic phase:After two weeks of cerebral infarction, there is no signal change or low signal on MRI DWI, while the signal on t2 and tfi2 is high. According to different MRI images, you can have a preliminary understanding of the staging of cerebral infarction, which should be further examined in time, and then targeted treatment under the guidance of doctors.