MAR image obtaining method and apparatus
An image, original image technology, applied in the field of image processing, can solve problems such as inability to accurately restore the true value, data loss, and blurred corrected images.
Active Publication Date: 2018-02-23
GENERAL ELECTRIC CO
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Problems solved by technology
Although these sinusoidal inpainting methods are generally successful in removing metal artifacts, they also reduce the resolution of the corrected image, in particular, they cannot accurately recover the replaced ground truth, and thus are corrected will appear blurry
For example, in normalized MAR (NMAR), which replaces the corrupted original data while suppressing most of the new artifacts, it still uses the full replacement scheme, which leads to the loss of data
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[0018] Specific implementations of the present invention will be described below. It should be noted that in the process of specific descriptions of these implementations, for the sake of concise description, it is impossible for this specification to describe all the features of the actual implementations in detail. It should be understood that, in the actual implementation process of any embodiment, just like in the process of any engineering project or design project, in order to achieve the developer's specific goals and to meet system-related or business-related constraints, Often a variety of specific decisions are made, and this can vary from one implementation to another. In addition, it will be appreciated that while such development efforts may be complex and lengthy, the technology disclosed in this disclosure will be Some design, manufacturing or production changes based on the content are just conventional technical means, and should not be interpreted as insuffic...
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The invention relates to a metal artifact reduction (MAR) image obtaining method and a corresponding apparatus. The method comprises the steps of performing reverse projection on an original sine curve to obtain an original image; obtaining a metal mask from the original image, and based on the metal mask, obtaining a metal track; performing metal beam hardening correction (BHC) on the original image to obtain a metal BHC image; obtaining a projection completion (PC) image from the metal track; performing calculation processing on the metal BHC image and the PC image to obtain a priori image;performing forward projection on the priori image to obtain a priori sine curve; and processing the priori sine curve to finally obtain an MAR image. Through the method and the apparatus, streak artifacts caused by high-density substances are reduced in the finally obtained MAR image.
Description
technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and device for obtaining metal artifact reduction (MAR) images. Background technique [0002] Metal artifact is a general term used in the measurement field to describe artifacts caused by radiation hardening, scattering, noise and nonlinear partial volume effects caused by dense objects. Metallic artifacts appear as thin striped artifacts as well as bright and dark banding artifacts, which seriously impair the image quality in computed tomography (CT) images and therefore often reduce the diagnostic value of these CT images. There are many MAR techniques that treat all parts of the raw data affected by metals as unreliable and replace them accordingly. Although these sinusoidal inpainting methods are generally successful in removing metal artifacts, they also reduce the resolution of the corrected image, in particular, they cannot accurately recover th...
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IPC IPC(8): G06T5/00
CPCG06T2207/10081G06T5/75Y02P10/25
Inventor 董淑琴李硕谢强
Owner GENERAL ELECTRIC CO