Computer-assisted categorizing of head computed tomography reports for clinical decision rule research.

Study Objective: To develop software that categorizes electronic head computed tomography (CT) reports into groups useful for clinical decision rule research.

Methods: Data were obtained from the Second National Emergency X-Radiography Utilization Study, a cohort of head injury patients having received head CT. CT reports were reviewed manually for presence or absence of clinically important subdural or epidural hematoma, defined as greater than 1.