X-Ray CT Reconstruction GUI for Hilbert Region Setting
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Solution Overview
Problem
Existing X-ray CT reconstruction methods face challenges in accurately setting or adjusting the Hilbert transformation region due to insufficient user control over the region of interest, leading to artifacts like cupping phenomena and noise in tomographic images, especially when parts of the subject protrude from the X-ray irradiation region.
Innovation Solution
An X-ray CT apparatus and method that includes a graphical user interface (GUI) for visually setting or adjusting the Hilbert transformation region, allowing users to accurately grasp the subject's shape and perform region-of-interest reconstruction processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Hilbert transformation method is used to reconstruct the tomographic image in the region of interest, then the cupping phenomenon and artifacts are suppressed, but the user cannot appropriately and easily set or adjust the Hilbert transformation region without accurately grasping the shape of the subject
Solution Approach 1:
The patent introduces a GUI as an intermediary tool between the user and the complex Hilbert transformation region setting process. The GUI provides visual feedback by displaying the subject shape and allowing users to set the region of interest through simple interactions like dragging and dropping, thereby mediating between the user's lack of expertise and the complex requirements of the transformation process
Solution Approach 2:
The system automatically determines the subject shape from the projection data and uses it to guide the region setting process. This self-service approach eliminates the need for users to manually analyze and understand the complex subject geometry, as the system provides the necessary information and constraints automatically
2Measurement precision
If projection data is acquired while rotating the subject with part of the subject in the X-ray irradiation region and the other part protruding, then magnification imaging is achieved, but artifacts and noise are generated at the boundary due to information contradiction
Solution Approach 1:
The patent extracts and processes only the relevant projection data corresponding to the region of interest using the Hilbert transformation method. By separating the region of interest from the rest of the data and applying specialized processing, it eliminates the harmful artifacts generated at the boundaries while preserving the magnification imaging capability
Solution Approach 2:
The patent changes the processing parameters by applying the Hilbert transformation specifically to the projection data in the region of interest. This parameter change in the processing method allows for accurate reconstruction in the magnified region while suppressing artifacts that would otherwise be generated by the partial inclusion of the subject
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 Hilbert transformation region, reducing artifacts and improving the quality of tomographic images by visually guiding users through the GUI for precise region selection and transformation.
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, a tomographic image, and perform processing of displaying a GUI, which is a graphical user interface for setting or adjusting a Hilbert transformation region on which processing by the Hilbert transformation is performed, in region-of-interest reconstruction processing.