Chest Radiography Versus Ultra-Low-Dose Chest Computed Tomography in Adults in the Emergency Department

Inclusion Criteria: * Patients presenting to the emergency department during daytime weekday hours in whom CAP is a differential diagnosis, and who are able to undergo the assigned imaging examination. Exclusion Criteria: * Patients requiring immediate imaging for a critical condition (for example suspected pneumothorax). * Bariatric patients exceeding the technical limits of the scanner * Pregnancy * Patients requiring additional imaging beyond the chest (for example abdominal CT) * Severe dementia, or need for sedation to complete imaging * Patients requiring mechanical ventilation. * Patients requiring accompaniment by medical staff during transport