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This paper presents a new synchronization method of the time-delay chaotic system and its application in medical image encryption.Compared with the existing techniques,the error system is greatly simplified because many coupled items can be considered zero items.An improved image encryption scheme based on a dynamic block is proposed.This scheme divides the image into dynamic blocks,and the number of blocks is determined by a previous block cipher.Numerical simulations are provided to illustrate the effectiveness of the proposed method.