3D Image Reconstruction via Automated Key Image Selection
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Solution Overview
Problem
Conventional three-dimensional image reconstruction techniques for moving objects, such as cardiovascular vessels, suffer from motion blur due to operator arbitrariness in selecting key images, leading to unstable image quality caused by varying tracking interval lengths.
Innovation Solution
A three-dimensional image processing apparatus that selects key images at predetermined angles and cardiac phases, with adaptive selection rates based on heart rate, to stabilize the tracking interval length and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator manually selects key images from multiple images, then feature points can be designated on selected images, but the tracking interval length varies causing unstable image quality
Solution Approach 1:
The patent changes the selection parameter from arbitrary manual choice to systematic automated selection based on radiography angle intervals. Key images are selected at predetermined angle intervals (e.g., every 15° or 30°) to ensure uniform tracking intervals, eliminating the quality instability caused by variable interval lengths while maintaining ease of operation through automation.
Solution Approach 2:
The system performs automatic key image selection based on predefined angle interval criteria, making the system self-sufficient in selecting appropriate key images without operator intervention. This eliminates human arbitrariness while maintaining operational simplicity, as the system automatically determines which images serve as key images based on their radiography angles.
2Quantity of substance
If images are disproportionally selected, then the number of tracking frames varies, but tracking accuracy decreases in intervals with more frames
Solution Approach 1:
The patent establishes a fixed parameter for key image selection based on radiography angle intervals. By selecting key images at uniform angular intervals rather than arbitrary selections, the system ensures consistent tracking interval lengths, maintaining tracking accuracy across all intervals regardless of the total number of images processed.
3Productivity
If conventional techniques are used for moving objects, then three dimensional image reconstruction can be performed, but motion blur occurs reducing image quality
Solution Approach 1:
The patent performs preliminary position correction using key images selected at predetermined angle intervals before final three-dimensional reconstruction. By establishing accurate positional relationships at these uniformly spaced key angles, the system creates a stable reference framework that eliminates motion blur in the final reconstructed image, maintaining both reconstruction capability and image sharpness.
Data Source
AI summary
A three dimensional image processing apparatus includes a storage unit storing data of images in different radiographing directions together with information concerning cardiac phases, a key image selection unit selecting key images from the images, a feature point designation unit designatting feature points on the selected key images in accordance with operation by an operator, and an image reconstruction unit reconstructing a three dimensional image from the images on the basis of positions of the designated feature points, wherein the key image selection unit selects, as the key images, a pair of images which are located at the same cardiac phase and whose radiographing directions are different by a substantially predetermined angle and images spaced apart from each other by an angle obtained by substantially equally dividing an interval between the pair of images by a predetermined number.