Currently, the diagnosis of TBI is time consuming, expensive, and often inconclusive. The typical method of diagnosis includes a neurological examination by an emergency physician. Additionally, expensive brain imaging equipment such as a CT scan is often used to help provide objective evidence to validate the diagnosis. Unfortunately, The CT scan is not able to detect most mild and some moderate TBIs as it is able to only detect bleeding or swelling in the brain. These imaging signs are not often present in mild and some moderate TBIs. Despite these limitations, nearly all patients are sent for a CT, which results in increased costs to the healthcare system and unnecessary patient exposure to radiation. The Food and Drug Administration (FDA), Center for Radiological Health (CDRH), The Joint Commission, The American College of Radiology, and the American College of Cardiology have recognized the overuse of medical imaging, especially CT scans.