X-Ray CT Reconstruction GUI for Rotation-Axis ROI Setting
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Solution Overview
Problem
Existing X-ray CT reconstruction methods generate artifacts (noise) at the boundary between a subject region and a protruding part due to information contradiction, necessitating accurate setting of the region of interest in the rotation axis direction, which is challenging to achieve.
Innovation Solution
An X-ray CT apparatus and method that utilizes a graphical user interface (GUI) to visually assist in setting and adjusting the region of interest in the rotation axis direction, incorporating Hilbert transformation to reduce artifacts by displaying X-ray projection images and allowing users to set the region of interest accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Hilbert transformation is used to reconstruct the tomographic image in the region of interest, then artifacts at the boundary between subject region and protruding part are reduced, but accurate setting of the region of interest in the rotation axis direction becomes necessary and difficult
Solution Approach 1:
An X-ray projection image is introduced as an intermediary visual aid between the user and the region of interest setting process. The projection image displays the subject's projection in the rotation axis direction, allowing users to visually identify boundaries and accurately set the region of interest without directly manipulating complex reconstruction parameters. This intermediary visualization mediates the interaction, making the setting process intuitive and accurate.
Solution Approach 2:
The patent replaces manual trial-and-error adjustment of region of interest parameters with a visual-based setting method. Instead of mechanically adjusting parameters in the rotation axis direction through complex operations, users simply reference the displayed projection image to visually determine and set the region boundaries, substituting mechanical adjustment with visual perception and direct setting.
2Ease of operation
If the region of interest is manually set without visual guidance, then the operation process becomes simple, but the position of the subject in the rotation axis direction cannot be accurately grasped leading to inappropriate setting
Solution Approach 1:
The X-ray projection image serves as a visual intermediary that bridges the gap between simple operation and accurate measurement. Users can maintain operational simplicity by directly setting parameters while simultaneously achieving measurement precision through visual reference to the projection image that displays subject boundaries in the rotation axis direction.
Solution Approach 2:
The projection image provides visual information through intensity variations and contrast changes that represent different regions of the subject. These visual changes in the projection data allow users to perceive subject boundaries and positions in the rotation axis direction, enabling accurate region of interest setting without complex measurement procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and accurate setting of the region of interest, reducing artifacts and improving the quality of tomographic images by visually guiding users through the GUI-based adjustment process.
Implementation Method 1
an X-ray irradiator configured to emit X-rays, an X-ray detector configured to detect the X-rays emitted from the X-ray irradiator and transmitted through a subject
Data Source
AI summary
In an X-ray CT apparatus, a processor is configured to display, on a display device, an X-ray projection image based on projection data, and perform processing of displaying a GUI, which is a graphical user interface for setting or adjusting a region of interest in a rotation axis direction of a subject for which a tomographic image is reconstructed, in region-of-interest reconstruction processing.