Grading of cerebral infarction using CT-Hounsfield unit to report the Hounsfield unit in acute, Subacute and chronic stroke

Non contrast Computed tomography of brain scanning is the primary line for exigency evaluation of acute stroke due to its common availability, speed, low cost and accuracy in detecting hemorrhage and cerebral infarct. CT has the ability to quantify the beam attenuation, hence the measurements are expressed in Hounsfield units (HU), which indicates the HU values of various stages of infarct pathologies associated with the brain. This study is based on HU in CT Brain images. First, the scan report of the patient is checked for cerebral infarct and affected location is noted along with the type of infarct. Then the CT images are verified by selecting an axial section in which the infarct is properly visualized and 3 region of interest (ROI) is placed within the infarct for a better average value which enables to get a range of HU value for each type of cerebral infarct which will be evaluated and graded according to the variation seen in the readings. According to this study HU value for diverse sorts of infarct varies. Three set of values obtained in the present study. As per this study the HU for acute infarct is >19.13 HU, Sub-acute infarct 9.55 – 19.13 HU and chronic infarct is < 9.55 HU helps to grade the cerebral infarct which make the diagnosis easier & quicker and it’s useful to the patient those who are not co-operated with MRI.