Sinogram Reconstruction for Cardiac CT Artifact Correction
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Solution Overview
Problem
In cardiac computed tomography angiography, existing methods for removing artifacts, such as motion artifacts, often alter image data values, thereby changing anatomical information, which is undesirable.
Innovation Solution
A reconstruction device and X-ray CT apparatus that acquire second sinogram data by removing artifacts from first sinogram data, select similar data points to generate third sinogram data, and reconstruct images based on this data without changing the original values, allowing for artifact correction while preserving anatomical information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If deep learning or numerical analysis methods are used to remove artifacts by changing pixel values, then artifact removal effectiveness is improved, but anatomical information accuracy deteriorates
Solution Approach 1:
The patent segments the sinogram data into multiple pieces and processes each piece separately to remove artifacts. By dividing the data processing into manageable segments, the method can apply artifact removal techniques while preserving the original anatomical information in each segment, thus resolving the contradiction between effective artifact removal and maintaining anatomical accuracy
Solution Approach 2:
The patent introduces sinogram data as an intermediary representation between the raw image data and the final processed image. By performing artifact removal in the sinogram domain rather than directly on image pixel values, the method can eliminate artifacts while preserving the original anatomical information, avoiding the problem of directly altering image data values
2Object-affected harmful factors
If image data values are changed to correct artifacts, then artifact correction capability is improved, but data integrity deteriorates
Solution Approach 1:
The patent performs artifact correction in advance during the image reconstruction process, before the final image is generated and used for diagnosis. By removing artifacts at the sinogram stage during reconstruction, the original image data integrity is preserved while still achieving effective artifact correction in the final image
Solution Approach 2:
The patent works with sinogram data as a copy or intermediate representation of the original image data, rather than directly modifying the final image pixel values. This allows artifact correction to be performed on the sinogram copy while the original image data remains unchanged, maintaining data integrity
Data Source
AI summary
A reconstruction device according to an embodiment includes a processing circuit. The processing circuit acquires a plurality of pieces of second sinogram data based on a plurality of pieces of first sinogram data, acquires third sinogram data by comparing the pieces of first sinogram data with the pieces of second sinogram data and by selecting pieces of first sinogram data having close similarity, and reconstructs an image on the basis of the third sinogram data.