Tomography Apparatus Motion Artifact Correction via Non-Rigid Registration
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Solution Overview
Problem
Tomography images reconstructed from moving objects often suffer from motion artifacts, leading to blurred edges and degraded image quality, which hinders accurate diagnosis.
Innovation Solution
A tomography apparatus and method that acquire partial images from different angular sections at distinct times, calculate motion information using non-rigid registration, and reconstruct a target image by warping and back-projecting the data to correct for motion, thereby reducing motion artifacts and improving image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tomography scan is performed on a moving object to acquire cross-sectional images, then internal structures can be visualized without overlap, but motion artifacts occur causing image blurring and degraded quality
Solution Approach 1:
The system performs preliminary actions by acquiring projection data from multiple angular sections and estimating motion information before final image reconstruction. Motion information is calculated from projection data acquired at different time points, and this motion estimation is then used to correct the projection data before reconstructing the final tomography image, thereby preventing motion artifacts from degrading image quality
Solution Approach 2:
The system implements feedback by estimating motion information from acquired projection data and using this information to correct subsequent image reconstruction. The motion estimation process provides feedback about object movement, which is then applied to adjust the reconstruction algorithm and compensate for motion-induced blurring, improving both image quality and diagnosis accuracy
2Manufacturing precision
If projection data is acquired from multiple angular sections at different time points to reconstruct a target image, then motion artifacts can be reduced, but the complexity of the reconstruction process increases
Solution Approach 1:
The system divides the tomography scan into multiple angular sections, acquiring projection data from each section at different time points. This segmentation allows the reconstruction process to handle motion artifacts from different regions separately, improving image quality while managing computational complexity through structured data organization
Solution Approach 2:
The system performs preliminary motion estimation and data organization before final reconstruction. By pre-processing the projection data from multiple angular sections and estimating motion information in advance, the system simplifies the subsequent reconstruction process while maintaining high image quality and reducing motion artifacts
Data Source
AI summary
A tomography apparatus includes a data acquirer configured to acquire partial images of an object including a first image and a second image having imaged a surface of a portion of the object corresponding to a first time and a second time, respectively, by performing a tomography scan on the object that is moving, and acquire first information indicating motion of the object by using the first image and the second image; and an image reconstructor configured to reconstruct a target image by using the first information.