Figure 2From: Comparison of ring artifact removal methods using flat panel detector based CT images Drawbacks of the wavelet-Fourier method. (a-c) Magnified image view of the coefficients of the horizontal, diagonal and filtered (Fourier) vertical detail bands, respectively. These three bands' coefficients must be free from stripe information. But we see that vertical stripes are present in these three detail band coefficients as marked by arrows.Back to article page