Clinically, in patients with cerebral hemorrhage, the amount of cerebral hemorrhage hematoma can be calculated by cranial CT. The formula often used is the length of the hematoma multiplied by the width of the hematoma multiplied by the number of layers divided by two, so that the amount of hematoma can be roughly derived. The length refers to the longest diameter at the largest level of the hematoma; the width refers to the wide diameter perpendicular to the long axis at the largest level of the hematoma; and the number of layers refers to the number of levels at which the hematoma occurs, and by dividing by two the amount of hematoma can be effectively derived. Such a formula is more accurate for calculating the hematoma if it has a more regular morphology, but if it appears lobulated or lunar, the calculated value is often not accurate enough.