Dynamic X-ray CT Magnification for Plate Samples
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Solution Overview
Problem
Current X-ray CT methods face limitations in achieving high spatial resolution for plate-shaped samples without destructive cutting, as the rotation or resolution is restricted by the sample's width, leading to incomplete observation of internal fine structures.
Innovation Solution
The method involves rotating the sample around a rotation center between the X-ray source and detector, varying the separation distance between the X-ray source or detector and the rotation center based on the sample's shape and angle, allowing for projection image acquisition at different magnification ratios over 180° or more, enabling nondestructive, high-resolution imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sample is approached to the X-ray source to increase magnification ratio, then spatial resolution is improved, but the sample and X-ray source come into contact
Solution Approach 1:
The patent applies dynamics by making the separation distance between the X-ray source and rotation center variable rather than fixed. The control apparatus dynamically adjusts this distance based on the rotation angle and sample shape, allowing the system to optimize magnification ratio while preventing contact. This is achieved through equations that calculate the required separation distance as a function of rotation angle, sample width, and magnification ratio, enabling continuous adaptation during the imaging process.
2Loss of information
If the sample is rotated by 360° to collect projection images, then complete three-dimensional CT image is obtained, but plate-shaped samples come into contact with the X-ray source
Solution Approach 1:
The system dynamically adjusts the separation distance during rotation to enable complete 360° imaging without contact. By continuously varying the distance between X-ray source and rotation center according to the sample's rotation angle and geometry, the apparatus maintains safe clearance while capturing projection images at all necessary angles for complete three-dimensional reconstruction.
Solution Approach 2:
The patent changes the parameter of separation distance as a function of rotation angle. Instead of maintaining a constant distance, the system modulates this parameter dynamically throughout the rotation cycle, allowing the sample to complete full rotation while preventing contact with the X-ray source at any angle.
3Reliability
If the separation distance is kept fixed to prevent contact, then sample safety is ensured, but magnification ratio and spatial resolution are limited
Solution Approach 1:
The system transitions from fixed to dynamic separation distance control. The control apparatus calculates and adjusts the optimal separation distance in real-time based on rotation angle and sample characteristics, ensuring sample safety is maintained while maximizing magnification ratio and spatial resolution at each moment of the imaging process.
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 efficient and nondestructive acquisition of three-dimensional CT images at high spatial resolution, improving the observation of fine structures within plate-shaped samples, such as electronic substrates and carbon fiber reinforced resins, by adjusting the magnification ratio and separation distances dynamically.
Implementation Method 1
X-ray CT collects a plurality of projection images (data for CT) while rotating a sample by 360°
Data Source
AI summary
There is provided an acquiring method of a projection image of a sample whose shape is uneven with respect to a rotation center, the method comprising the steps of setting the sample S0 at a position of the rotation center C0 provided between an X-ray source 116a and a detector 117, and acquiring the projection image of the sample S0 at each different rotation angle for each different magnification ratio over a rotation angle of 180° or more by rotating the sample S0 around the rotation center C0, and by relatively changing a separation distance between the X-ray source and the rotation center, or a separation distance between the rotation center and the detector in an optical axis direction according to the shape of the sample S0 and the rotation angle of the sample S0.