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Year : 2003  |  Volume : 13  |  Issue : 2  |  Page : 213-217
Role of diffusion weighted MR images in early diagnosis of cerebral infarction

Department of Radiodiagnosis, M.A.M.C and Lok Nayak Hospital, Jawaharlal Nehru Marg, Delhi-110002, India

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K Rima
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Objectives : The purpose of this study was to determine the role of Diffusion weighted (DW) MR Imaging in the early diagnosis and staging of evolution of cerebral infarction. Material and Methods : Forty patients of suspected cerebral infarction werestudied over an eight month period by echoplanar diffusion weighted (DW) MR images obtained on a 1.5 Tesla. MR Scanner the criteria for inclusion in the study included a clinical diagnosis of stroke, focal neurological deficits and clinical signs and symptoms persisting longer than 24 hours after onset. DW images were visually analyzed and compared with conventional spin-echo and FLAIR images for changes in signal intensity. Results Diffusion weighted images showed changes in signal intensity in all (11/11) lesions less than 1 day old, 15/16 lesions which were 1 to 7 days old, 4/7 lesions 8-14 days old and 1/12 lesions more than 14 days old. Conclusion : Abnormal signal intensity was present on all DW MR studies obtained in patients within 24 hours of symptom onset and in more than 94 percent of patients within the first two weeks after ictus. The percentage of abnormal diffusion studies decreased with time and changes in signal intensity were rare if MR scanning was done more than two weeks after the onset of clinical symptoms.

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