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Background Thrombolysis with tissue-type plasminogen activator (IV-tPA) is a well-proved, widely used treatment in acute ischemic stroke patients, many predictors of functional outcome have been proposed as Age, vascular risk factors, initial clinical evaluation on admission using National institute of health stroke scale(NIHSS), functional state of patient(b.L) baseline before stroke and 3 months (3m) after stroke using modified Rankin stroke scale (MRS)and the most controversial Diffusion weighted image characteristics (volume, heterogeneity) Objective To evaluate DWI MRI characteristics (volume, heterogeneity) as a predictor for outcome in Acute stroke patients treated by IV-tPA Patients and Methods This study will be done on a sample of 100 acute ischemic stroke Egyptian patients receiving intra-venous tissue -type plasminogen activator presenting to Ain-Shams university hospitals Results Highly statistically significant (p-value < 0.001) Positive correlation (r = 0.394) between volume (DWI) and MRS (3m) post discharge in studied patients, No statistically significant (pvalue > 0.05) relation between heterogeneity and other studied parameters (MRS, NIHSS D & ADC values) in studied patients Conclusion DWI infarct volume is a predictor for outcome in acute ischemic stroke patients treated by tPA