X-ray CT Detector Orbit Adjustment for Head Contact Prevention
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Solution Overview
Problem
Existing X-ray CT imaging apparatuses face challenges in obtaining clear images while preventing the X-ray generator and detector from contacting the subject, especially when the detector is brought closer to the imaging region than the generator, leading to potential contact with the head during imaging.
Innovation Solution
An X-ray CT imaging apparatus with a turning support mechanism that includes a shaft between the X-ray generator and detector, controlled by motors to adjust the distance of the detector relative to the imaging region, allowing the detector to turn along a go-around orbit that comes close to the front side of the head and moves away from the rear side, preventing contact while maintaining a clear imaging position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the X-ray detector is brought closer to the imaging region than the X-ray generator to obtain clear images, then the image quality is improved, but the X-ray detector may come into contact with the subject during rotation
Solution Approach 1:
The patent implements dynamic adjustment of the detector-to-subject distance during rotation by moving the turning axis or subject position in the plane perpendicular to the turning axis. This allows the system to maintain optimal imaging distance at critical rotation angles while preventing contact, resolving the contradiction between image quality and contact prevention.
Solution Approach 2:
The system changes the enlargement ratio by relatively adjusting the distance between the X-ray generator/detector and the rotation center. By dynamically modifying these parameters during rotation, the system achieves clear imaging without the detector contacting the subject.
2Device complexity
If the X-ray generator and X-ray detector are turned at a constant enlargement ratio, then the imaging geometry is simplified, but the X-ray detector may contact the subject when the center of the imaging region is not matched with the center of the subject
Solution Approach 1:
The patent transitions from constant enlargement ratio to dynamic enlargement ratio adjustment. The turning mechanism simultaneously rotates the generator-detector pair while the moving mechanism adjusts their distance from the rotation center, creating a dynamic imaging geometry that prevents contact while maintaining image quality.
3Measurement precision
If the X-ray detector is positioned close to the head for high-quality imaging, then the image resolution is improved, but the risk of mechanical contact increases
Solution Approach 1:
The system preemptively adjusts the detector position and turning axis location to maintain a safe distance from the subject throughout the rotation path. By planning the rotation trajectory in advance and positioning the turning axis appropriately, the system prevents mechanical contact before it can occur, ensuring both high-resolution imaging and mechanical safety.
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 clear X-ray CT imaging by allowing the X-ray detector to turn as close to the head as possible without contacting it, while maintaining a stable imaging position and reducing shaking, thus ensuring high-quality images are obtained without mechanical interference.
Implementation Method 1
an X-ray generator that generates an X-ray
Data Source
AI summary
When X-ray CT imaging is performed with a part located close to a front of a head as the imaging region, using the turning mechanism and the distance changing mechanism, the turning controller causes the X-ray generator and the X-ray detector to turn around the head while locating the imaging region therebetween, and causes the X-ray detector to turn along a go-around orbit, in which the X-ray detector comes close to the imaging region with respect to a front side of the head and moves away from the imaging region with respect to a rear side, by changing a distance between the X-ray detector and the center of the imaging region.