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Noise Estimation for Single-Slice Sinogram of Low-Dose X-Ray Computed Tomography Using Homogenous Patch
- Source :
- Mathematical Problems in Engineering, Vol 2012 (2012)
- Publication Year :
- 2012
- Publisher :
- Hindawi Limited, 2012.
-
Abstract
- We present a new method to estimate noise for a single-slice sinogram of low-dose CT based on the homogenous patches centered at a special pixel, called center point, which has the smallest variance among all sinogram pixels. The homogenous patch, composed by homogenous points, is formed by the points similar to the center point using similarity sorting, similarity decreasing searching, and variance analysis in a very large neighborhood (VLN) to avoid manual selection of parameter for similarity measures.Homogenous pixels in the VLN allow us find the largest number of samples, who have the highest similarities to the center point, for noise estimation, and the noise level can be estimated according to unbiased estimation.Experimental results show that for the simulated noisy sinograms, the method proposed in this paper can obtain satisfied noise estimation results, especially for sinograms with relatively serious noises.
- Subjects :
- Article Subject
Pixel
business.industry
lcsh:Mathematics
General Mathematics
General Engineering
Sorting
Variance (accounting)
lcsh:QA1-939
Noise
Similarity (network science)
lcsh:TA1-2040
Computer vision
Point (geometry)
Wafer
Tomography
Artificial intelligence
lcsh:Engineering (General). Civil engineering (General)
business
Algorithm
Mathematics
Subjects
Details
- ISSN :
- 15635147 and 1024123X
- Volume :
- 2012
- Database :
- OpenAIRE
- Journal :
- Mathematical Problems in Engineering
- Accession number :
- edsair.doi.dedup.....deb065e0601e85dde31890960785b6f1