چاپ صفحه |  صفحه نخست سامانه |  نویسندگان |  اطلاعات تفضیلی |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| نویسنده | نفر چندم مقاله |
|---|---|
| رامین قاسمی شایان | اول |
| عنوان | متن |
|---|---|
| خلاصه مقاله | Background and Aim : Traumatic brain injury (TBI) is a major cause of morbidity and mortality worldwide. Imaging plays an important role in the evaluation, diagnosis, and triage of patients with TBI. Recent studies suggest that it will also help predict patient outcomes. TBI consists of multiple pathoanatomical entities.A brain imaging method could be defined as any experimental technique that allows human (or animal) brain structure or function to be studied, preferably in vivo in the current context. Such a method should ideally produce accurate timing (in the case of functional imaging) and spatial localization (for both structural and functional imaging) of cerebral function, structure, or changes in these properties of the brain. The method should be minimally invasive and repeatable (to facilitate use in treatment monitoring and development of therapeutic strategies).In recent years, many researchers have emphasized the role of various forms of brain injury in producing neurocognitive deficits and neurobehavioral abnormalities. As a result, increased attention has turned to imaging evaluation of the head trauma patient. Methods : A hand-search of articles published in the past 5 years (2005–2009) that contain information of interest to the radiologist interpreting CT and MR findings of head trauma patients will be discussed using PubMed and Google Scholar. Results : In subacute and chronic stages of head injuries, MR is more sensitive than CT for detecting brain contusions. T2-weighted spin-echo images are best for demonstrating the abnormalities. CT is better than MR for showing hemorrhagic components during the acute phase of trauma. Hemorrhages are displayed on MR as high signal intensity on Ti -weighted images and as either low or high signal on T2- weighted images, depending on the age of the hemorrhage. The approximate age of hemorrhagic contusions is often suggested by the signal characteristics and appearance on Ti - and T2-weighted images. The improved detection and anatomic localization of brain contusions by MR provides new opportunities to correlate brain structure with function, and should also allow more accurate assessment of brain injuries and prediction of outcome. CT will likely retain an important role in evaluating acute head injuries to exclude life-threatening intracranial hemorrhage or cerebral swelling. Definition of the role of MR in evaluating acute head trauma requires further investigation. Conclusion : This review has outlined a variety of aspects of head trauma imaging in the recent medical literature. It is worth summarizing both the imaging advances and some issues that remain to be addressed. First, it is clear that MRI is much more sensitive than CT for detection of small trauma-related brain abnormalities .Furthermore, some MRI sequences are particularly sensitive to detection of specific forms of brain injury. However, the actual clinical relevance of this increased sensitivity is relatively unclear. Although articles reporting correlation of imaging findings and clinical outcome have some value, more information is needed regarding how the increased sensitivity of MRI techniques affects physician decision making. |
| کلمات کلیدی | Neuroimaging,CT Scan,MRI,Trauma,Brain |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| 7th brain.pdf | 1398/11/16 | 600358 | دانلود |
