X-ray Analyzer Shadow Image Projection for Target Positioning
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Solution Overview
Problem
Conventional X-ray CT apparatuses face challenges in accurately and efficiently positioning imaging targets within the X-ray transmission image field, particularly in cases where the target is not centered, leading to incomplete imaging and the need for repositioning and re-imaging.
Innovation Solution
An X-ray analyzer is equipped with a light irradiation mechanism that projects a shadow image of the imaging target onto an X-ray detector, allowing for visual confirmation of the target's position and size, enabling accurate alignment even in offset scanning configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning is confirmed from fluoroscopic image or CT imaging result, then positioning accuracy can be verified, but time consumption increases due to door closing and reopening operations
Solution Approach 1:
The shadow image projection mechanism performs preliminary positioning verification before actual CT imaging. By projecting the shadow image of the imaging target onto the detector using visible light, the system allows operators to confirm target positioning and adjust if necessary before committing to the full imaging process, thereby avoiding time-wasting re-imaging operations
Solution Approach 2:
The patent introduces a shadow image projection mechanism as an intermediary step between target placement and actual CT imaging. This intermediary mechanism uses visible light to create a projected shadow image that operators can visually observe and use for positioning adjustments, eliminating the need to open/close the door multiple times while maintaining positioning accuracy
2Extent of automation
If optical camera is used to capture image from above, then positioning can be automated, but positioning precision relative to X-ray transmission image field deteriorates
Solution Approach 1:
The patent replaces the optical camera-based positioning system with a shadow image projection mechanism. Instead of capturing images from above and processing them computationally, the system directly projects the shadow image of the imaging target onto the X-ray detector using visible light, allowing operators to visually confirm positioning accuracy that directly corresponds to the X-ray transmission image field
Solution Approach 2:
The shadow image projection mechanism creates an optical copy of the imaging target's silhouette that is projected onto the detector plane. This copied shadow image directly represents the target's position and dimensions as they will appear in the X-ray transmission image, providing accurate visual feedback for positioning without the complexities of optical camera-based 3D reconstruction
3Area of stationary object
If offset scanning is used to expand imaging visual field, then field of view increases, but confirmation of target positioning becomes difficult
Solution Approach 1:
The shadow image projection serves as an intermediary visualization tool that works effectively with offset scanning configurations. By projecting the shadow image onto the detector, operators can clearly see the target's position relative to the actual imaging field boundaries, making positioning confirmation straightforward even when the X-ray source and detector are offset from each other
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
This approach allows for easy and accurate positioning of the imaging target, ensuring that the entire target is within the X-ray transmission image field, reducing the need for re-imaging and improving the efficiency of the imaging process.
Implementation Method 1
a light irradiation mechanism configured to irradiate light coaxially with an X-ray optical axis of the X-ray irradiated from the X-ray source to project a shadow image of the imaging target onto a position of the X-ray detector
Data Source
AI summary
An X-ray analyzer has a configuration including an X-ray source, an X-ray detector configured to detect an X-ray irradiated from the X-ray source, a rotary stage (stage) disposed between the X-ray source and the X-ray detector, and configured to hold an imaging target, and a light irradiation mechanism configured to irradiate light coaxially with an X-ray optical axis of the X-ray irradiated from the X-ray source to project a shadow of the imaging target onto a position of the X-ray detector.