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Ege Journal of Medicine
2001, Cilt 40, Sayı 1, Sayfa(lar) 047-053
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Cem Çallı, Ahmet Yeşildağ, Ömer Kitiş, Nilgün Yünten
Ege Üniversitesi Tıp Fakültesi Radyoloji Anabilim Dalı, Bornova, İzmir
Keywords: cerebral infarction, magnetic resonance imaging, diffusion-weighted imaging

In this study, it is aimed to evaluate the use of diffusion-weighted imaging (DWI) findings in cerebral infarctions and to investigate the signal characteristics in different stages of infarction. 43 patients with the clinical evidence of cerebral infarction were included in the study. Ail patients were examined with echo-planar DWI followed by standard T1W and T2W images on a 1.5T MR unit With this imaging protocol, total scan time was 5.10 min (TSE T2W= 2.45 min, TSE T1W= 1.52 min, DWI = 33 sec) The MR findings in standard conventional sequences and diffusion-weighted images were correlated with clinical findings. DWI with b values of 0, 500 and 1000 sec mm2 and apparent diffusion coefficient (ADC) map images were obtained and DWI findings were correlated with standard spin-echo images, 10 patients with acute cerebral infarction underwent follow-up DWI. Of these 43 patients, 3 patients had hyperacute, 22 patients had acute, 11 patients subacute, and 7 had chronic cerebral infarctions. Different stages of cerebral infarctions (acute and chronic) were detected in 2 patients among acute phase patients. Acute infarctions were hyperintense on DWI (b=500 and 1000sec/mm2) and hypointense on ADC map images. Chronic infarctions were hypointense on DWI and hypenntense on ADC map images, In the follow-up patients, the acute infarctions showed lessening ol the signal on DWI (b=500 and 1000sec/mm2) and increase on ADC map images. DWI is a sensitive and a specific modality in the assesment of cerebral ischemia. Moreover, it enables the MR examination of these mostly uncooperative patients with its short scanning time, contributing to the diagnosis and clinical management.

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