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Other ways for diagnosing TBI can include various imaging tests like a CT scan or an MRI scan. However, these imaging techniques are often not sensitive/specific enough for milder TBI. According to experts, only 5-10% of mild TBI patients have abnormal CT/MRI scans. The problem with these scans is that they can only detect damage on a macroscopic level, whereas mild TBI manifests primarily at a microscopic level. Therefore, doctors can mistakenly believe that patients with a standard CT or MRI scan have not suffered a TBI.<ref name="Arti28">McKinlay, A., Lin, A., & Than, M. (2018). A comparison of emergency department medical records to parental self-reporting of traumatic brain injury symptoms. Concussion, 3(1), CNC52. https://doi.org/10.2217/cnc-2017-0017</ref> All in all, improvements are needed to objectively and effectively determine whether or not a patient is suffering from a TBI.