Abstract: This study observed the value of CT and MRI in the diagnosis of intracranial infection in patients after craniocerebral surgery, and analyzed the risk factors affecting the occurrence of intracranial infection in patients. Patients with suspected intracranial infection after craniocerebral surgery were selected as the research objects. All patients underwent MRI and CT examinations. After cerebrospinal fluid culture, 54 of 300 patients with suspected intracranial infection were finally diagnosed. The main infectious pathogens were Gram-positive bacteria, accounting for 61.11%, and Gram-negative bacteria accounted for 38.89% of patients. The sensitivity of CT in the diagnosis of intracranial infection in patients with craniocerebral surgery was 77.78%, the specificity was 79.67%, and the accuracy was 79.33%. The sensitivity of MRI in diagnosing intracranial infection in patients with craniocerebral surgery was 83.33%, the specificity was 87.80%, and the accuracy was 87.00%. Open surgery, more than one operation, more than 6 hours of operation time, and more than 5 days of extraventricular drainage will increase the risk of postoperative intracranial infection (OR values were 1.806, 2.160, 1.626, 1.694, respectively, P<0.05). The accuracy of MRI in diagnosing intracranial infection in patients after craniocerebral surgery is higher than that of CT examination. There are many factors that cause intracranial infection after craniocerebral surgery, which should be paid attention to and timely targeted intervention to reduce the risk of intracranial infection.

Key words: CT, MRI, brain surgery, intracranial infection