Tomography Apparatus Motion Reliability Compensation
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Solution Overview
Problem
Computed tomography (CT) image processing systems face challenges in obtaining accurate cross-sectional images of moving objects due to motion artifacts, which degrade image quality and make it difficult to compensate for object movement effectively.
Innovation Solution
A tomography apparatus and method that acquire and process images at different time points to determine motion reliability, allowing for motion compensation in image reconstruction, with features including directional vectors, error calculation, and weighted compensation based on reliability values to improve image accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion compensation is performed on the entire target image, then image quality is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent divides the target image into multiple partial sections and performs motion compensation selectively on each section based on its motion reliability value. This segmentation approach allows the system to apply complex processing only where necessary, improving image quality in regions with reliable motion data while avoiding unnecessary computational overhead in regions with unreliable motion data.
Solution Approach 2:
The patent applies different processing strategies to different regions of the image based on local motion reliability characteristics. Regions with high motion reliability undergo full motion compensation, while regions with low motion reliability are handled differently (either skipped or processed with reduced complexity), optimizing the balance between image quality and computational resources.
2Reliability
If motion compensation is performed, then artifacts are reduced, but processing time increases
Solution Approach 1:
By segmenting the image into partial sections and evaluating motion reliability for each, the system identifies and processes only those regions where motion compensation will be effective. This reduces the total processing time compared to applying motion compensation to the entire image, while still achieving artifact reduction in the relevant regions.
Solution Approach 2:
The patent performs motion compensation partially - only on portions of the image where motion reliability indicates it will be beneficial. This partial action approach avoids the excessive processing time that would result from applying motion compensation uniformly across the entire image, while still achieving the desired artifact reduction where it matters most.
3Measurement precision
If motion reliability threshold is set high, then processing accuracy is improved, but fewer regions qualify for motion compensation
Solution Approach 1:
The patent accepts that different regions of the image will have different motion reliability characteristics. By using a high threshold for motion reliability, the system ensures that only regions with sufficiently accurate motion measurements undergo motion compensation, maintaining high processing accuracy while allowing the processed region area to vary locally across the image.
Data Source
AI summary
A tomography apparatus and a method of processing a tomography image are provided. The tomography apparatus includes a data acquirer configured to acquire a first image corresponding to a first time point and a second image corresponding to a second time point, based on data that is obtained from performing tomography on a moving object, acquire first information indicating a movement of the object between the first time point and the second time point, and determine a motion reliability indicating a degree to which the movement of the object corresponds to a physical movement, based on the first information. The tomography apparatus further includes an image reconstructor configured to reconstruct a target image indicating the object at a target time point, based on the motion reliability.