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Objective:To explore level diagnosis on CT and BA in cerebrovascular diseases. Meth-od:CT and BA were examined in 53 patients with eerebrovascular diseases and compared in level diagnosis. Result: The sides on level diagonsis of CT and BA were identical. The rang of diseases was larger in BA than that in CT. Conclusion: BA can help level diagnosis in cerebrovaseular diseases. The level diagnosis of BA and CT were basically identical.