Reducing Noises and Artifacts Simultaneously of Low-Dosed X-Ray Computed Tomography Using Bilateral Filter Weighted by Gaussian Filtered Sinogram

Figure 2

Abdominal CT images of a 62-year-old woman. (a) Original SDCT image with tube current time product 150 mAs. (b) Original LDCT image with tube current time product 60 mAs. (c) Original LDCT image with tube current time product 30 mAs. (d, e, f) LDCT images (60 mAs) processed by BF, context, and MBF, respectively. (g, h, i) LDCT images (30 mAs) processed by BF, context, and MBF, respectively. (j, k, l) LDCT images (60 mAs) processed by MRBF, WIA-LN and proposed method, respectively. (m, n, o) LDCT images (30 mAs) processed by MRBF, WIA-LN, and proposed method, respectively. Compared to the original LDCT images in (b) and (c), the improvement of preservation of the hepatic cyst (white circles) for the WIA-LN, and proposed method in processed LDCT image (k), (l), and (n), (o) can be observed.

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