A method for estimating noise variance of CT image

作者：Ikeda Mitsuru^*; Makino Reiko; Imai Kuniharu; Matsumoto Maiko; Hitomi Rika

来源：Computerized Medical Imaging and Graphics, 2010, 34(8): 642-650.

DOI：10.1016/j.compmedimag.2010.07.005

• Medical Image analysis
• Image noise variance
• Radiation dose
• Image quality evaluation
• CT images

Rank et al have proposed an algorithm for estimating image noise variance composed of the following three steps the noisy Image is first filtered by a difference operator a histogram of local signal variances is then computed and finally the noise variance is estimated from a statistical evaluation of the histogram We have verified the accuracy of this algorithm on a CT image by indirect methods and have shown that this method is able to estimate CT image noise variance with reasonable accuracy regardless of whether or not the noiseless Image is uniform Further we have proposed a simple alternative method for the last two steps of the Rank et al method However one must pay attention to the fact that the estimated noise variance will be

• 出版日期2010-12