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In the subacute and chronic stages,subarachnoid hemorrhage was seen as an area of high signal intensity on T2 weighted,proton density-weighted,T2- weighted and moderately T2-weighted MR images in 63%,90%,25%and 92%of cases respectively.On CT scans,subarachnoid hemorrhage was seen as an area of high attenuation in only 46%of cases.Especially in the chronic stage, subarachnoid hemorrhage was seen as an area of high signal intensity more frequently by MR imaging than by CT(90%on T2-weighted images;100%on moderately T2-weighted images;and 10%on CT scans).High signal intensity subarachnoid hemorrhage was demonstrated by MR imaging until a maximum of 39 days after the ictus,whereas high attenuation subarachnoid hemorrhage was demonstrated by CT until a maximum of 17 days after the ictus.Our findings show that MR imaging is superior to CT for the diagnosis of subacute and chronic subarachnoid hemorrhage.MR imaging is especially useful for the diagnosis of chronic subarachnoid hemorrhage. |
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aneurysm
CAT scan
CAT scan,abnormal
MRI
MRI,abnormal
MRI,CAT scan compared to
neurologic disease,diagnoses of
subarachnoid hemorrhage
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