New Orleans criteria. 

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... estimated 1.7 million people sustain a Traumatic Brain Injury (TBI) annually are seen in the United States' emergency rooms and 80% of them are classified as minimal or minor head injury where they are treated and released from an emergency department [1]. TBI is defined as a patient with a history of loss of consciousness, amnesia, or disorientation and a Glasgow Coma Scale (GCS) score of 13 -15 [2]. Most patients with minimal head injuries who are not suf- fered from the mentioned symptoms are rarely requiring admission to hospital and can be discharged home [2]. However, there are 10% of those patients who will develop deterioration in their conditions by intracranial hematoma and only 1% will require neurosurgical intervention [3]. Therefore, an early diagnosis of intracranial hematoma by Computed tomography (CT) and early interventions in such patients are critical and important [2]. Computed tomography (CT) scan is an essential diagnostic tool in Emergency room due to its easy accessibilities with high accurate diagnostic approach. Moreover, CT scan is an integral rule to triage and manage patients with traumatic head injury because the consequences of missing a clinically important problem are potentially life threatening. There- fore, there is an increase in the number of CT scans requested at an astonishing rate by emergency physicians (ERs) more than any other department. For exam- ple, in 10 large Canadian hospitals, the use of CT scan has increased 165%, from 30% to 80%, especially for minor head injury patients [1]- [9]. Routine scanning results in increased in radiation exposure, and in large health care expenditures, especially when 90% of CT scans are negative for clinically important brain in- jury. So, reliance on clinical judgment could reduce CT use, but the cost will be missing in 20% of patients with intracranial injury [5] [8] [9]. Furthermore, stu- dies and articles which have strongly suggested that all patients with minor head injury should undergo CT scan; it would eventually leads to a greater than 300% increase in the use of CT scan for Canadian and European patients with minor head injury [2]. Under these circumstances, the use of CT scan for minor head injury should be justified. Substantial potential for improving the efficiency of managing minor head trauma appears possible through the applications of clin- ical decision rules. A clinical decision rule is derived from original research and is defined as a decision making tool that incorporates 3 or more variables from the history, examination, or simple tests [9]. Several clinical decision rules are developed such as Canadian CT Head Rule (CCHR) " Figure 1", New Orleans CT Head Criteria (NOCC) " Figure 2" and guidelines from the National Institute for Clinical Excellence (NICE) [9]. This study aims to measure the emergency physicians' awareness toward indications of CT scanning in TBI according to CCHR and/or NOC by using a designed questionnaire with a short clinical sce- ...