MRI is a physical phenomenon discovered in 1946. In 1978, MRI was used for imaging the human body, and magnetic resonance imaging (MRI) is a technique that combines the physical phenomenon of MRI and computer imaging technology for medical diagnosis. Compared with CT, MRI has its advantages and disadvantages; the sensitivity of MRI is higher than CT, and it is also better than CT in showing the tissue structure of liver cancer; CT can usually only perform cross-sectional scans, while MRI can perform cross-sectional scans, as well as multi-directional scans such as coronal and sagittal scans; MRI is not interfered by bone artifacts like CT, and it is better than CT in diagnosing liver cancer near the rib cage. However, MRI scan time is longer and can easily interfere with the imaging due to the movement of breathing, resulting in blurred images; MRI examination cannot be performed with metal objects, and those wearing cardiac pacemakers and other metal implants cannot perform MRI examination. Due to the above factors, the sensitivity of MRI is higher than that of CT, but due to the high cost, it should not be used as a routine examination for liver cancer, but if there is clinical suspicion of liver cancer and CT examination cannot detect or confirm it, MRI can be examined.