MRI examinations can be performed by eating, either by MRI scan or MRI enhancement, and eating does not affect the examination. The principle of MRI is to scan by magnetic field, and MRI can show early infarct lesions, which is better than CT, which cannot show infarct lesions within 6 hours. In addition, MRI is also better than CT for joint and soft tissue examinations, for example, for knee joints, MRI can visualize ligament and meniscus injuries, while CT cannot visualize ligament and meniscus conditions.