Brain infarction generally does not involve X-rays because X-rays primarily target bone issues, not brain tissue issues. If a brain infarction occurs, a cranial CT or MRI can be performed. In acute cases of sudden onset, a cranial CT is primarily used to exclude cerebral hemorrhage, as brain infarction typically does not show up in the acute phase. However, in cases of extensive brain infarction, changes might also appear on a CT during the acute phase. Additionally, after the acute phase, about 1 day or 24 hours later, brain infarctions generally appear as low-density shadows on a CT. On an MRI, in diffusion imaging, brain infarctions generally appear as high-density, high-signal areas, while they appear as low-signal areas in T1 imaging and high-signal areas in T2 imaging. It is also suggested to perform cranial magnetic resonance angiography to examine the status of the blood vessels.