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Method and system utilizing parameter-less filter for substantially reducing streak and or noise in computer tomography (CT) images
US8965144B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8965144-B2 |
| Application number | US-201313890132-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 8, 2013 |
| Priority date | Jun 6, 2011 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
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Abstract
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Photon starvation causes streaks and noise and seriously impairs the diagnostic value of the CT imaging. To reduce streaks and noise, a new scheme of adaptive Gaussian filtering relies on the diffusion-derived scale-space concept in one embodiment of the current invention. In scale-space view, filtering by Gaussians of different sizes is similar to decompose the data into a sequence of scales. As the scale measure, the variance of the filter linearly relates to the noise standard deviation of a predetermined noise model in the new filtering method. The new filter has only one optional parameter that remains stable once tuned. Although single-pass processing using the new filter generally achieves desired results, iterations are optionally performed.
First claim
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What is claimed is: 1. A method of equally reducing noise in measured signals, comprising the steps of: a) determining a relative value in noise variance at each of the measured signals based upon a function of a predetermined noise model to generate a noise-model based variance; b) automatically generating a discrete filter kernel of a noise-equalizing filter for each of the measured signals based upon the noise-model based variance; and c) applying the discrete filter kernel…
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- What does patent US8965144B2 cover?
- Photon starvation causes streaks and noise and seriously impairs the diagnostic value of the CT imaging. To reduce streaks and noise, a new scheme of adaptive Gaussian filtering relies on the diffusion-derived scale-space concept in one embodiment of the current invention. In scale-space view, filtering by Gaussians of different sizes is similar to decompose the data into a sequence of scales. …
- Who is the assignee on this patent?
- Toshiba Kk, Toshiba Medical Sys Corp
- What technology area does this patent fall under?
- Primary CPC classification G06T5/002. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Feb 24 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).