关键词: 盲均衡, 恒模算法, CT图像, 均方误差, 时变步长

Abstract: A novel adaptive variable step-size constant module medical CT image blind equalization algorithm is proposed.The process of image restoration transformed by a linear operation is equivalent to one dimensional blind equalization.The constant modulus blind equalization cost function applied to medical CT image is founded.The mean square error is utilized as step-size control factor to speed up the convergence and improve the performance of the algorithm.Computer simulations show that new algorithm improves peak signal to noise ratio，restoration effects and efficiency of operations，and speeds up the convergence speed.

Key words: blind equalization, constant module algorithm, CT image, mean square error, variable step-size