Segmented X-ray Target Nugget Array for Micro-CT Imaging
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Solution Overview
Problem
Current X-ray sources for micro-CT and nano-CT applications are not versatile enough and lack the necessary resolution and durability for effective imaging of small specimens, as they rely on traditional high-atomic-number targets that require frequent replacement and calibration.
Innovation Solution
A novel X-ray source architecture utilizing a substrate with an array of mutually isolated high-atomic-number nuggets of varying compositions, sizes, and shapes, allowing for selective activation and easy replacement, combined with a thermally conductive coating for improved heat management and radiation shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional high-atomic-number targets are used for X-ray generation, then X-ray brightness is achieved, but target lifespan is short and frequent replacement is required
Solution Approach 1:
The target is segmented into multiple individual high-atomic-number nuggets (at least two nuggets with different compositions, sizes, and/or shapes) arranged in an array on a substrate. This allows selective activation of individual nuggets, extending the operational lifespan by rotating through multiple nuggets before any single one degrades.
Solution Approach 2:
Different nuggets have different physical parameters (composition, size, shape) that affect X-ray generation characteristics. By selecting and activating specific nuggets based on their parameters, the system can optimize X-ray brightness for different imaging requirements while managing target wear.
2Device complexity
If traditional single-target X-ray sources are used, then simplicity is maintained, but versatility and adaptability are limited
Solution Approach 1:
The target substrate integrates multiple high-atomic-number nuggets with different compositions, sizes, and shapes into a single array structure. This multi-functional design allows the same physical target to provide various X-ray generation characteristics, enabling versatile imaging capabilities across different specimen types and resolutions without requiring multiple separate targets.
Solution Approach 2:
The system dynamically selects which nugget to activate based on imaging requirements. The controller can switch between different nuggets in the array, providing adaptive versatility while maintaining a relatively simple fixed substrate structure.
3Productivity
If high beam current is used to increase X-ray brightness, then imaging efficiency improves, but thermal damage to the target increases
Solution Approach 1:
The segmented nugget array allows distribution of thermal load across multiple nuggets. By rotating through different nuggets, each individual nugget experiences reduced cumulative thermal stress, enabling sustained high beam current operation without excessive thermal damage to any single nugget.
Solution Approach 2:
Multiple nuggets serve as functional copies with similar X-ray generation capabilities. When one nugget becomes thermally damaged, another nugget can be activated as a replacement, maintaining imaging efficiency without interruption while the damaged nugget cools or is replaced.
4Reliability
If frequent target replacement is performed, then optimal imaging performance is maintained, but calibration time and operational downtime increase
Solution Approach 1:
The segmented nugget array allows individual nuggets to be used and depleted independently. Instead of replacing the entire target when one nugget degrades, the system can simply switch to another nugget in the array, dramatically reducing replacement frequency and associated calibration time.
Solution Approach 2:
Multiple nuggets are pre-installed on the target substrate during manufacturing. This preliminary preparation ensures that when one nugget degrades, replacement nuggets are already in position and ready for immediate activation, eliminating the need for time-consuming target replacement and recalibration 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
This approach enhances imaging resolution, extends nugget lifespan, reduces target replacement costs and calibration time, and allows for customizable X-ray spectra and brightness, enabling more efficient and accurate tomographic investigations.
Implementation Method 1
X-rays are generated by irradiating a target with a charged particle beam
Implementation Method 2
irradiating a target with a charged particle beam; producing a corresponding series of images
Implementation Method 3
combined with a thermally conductive coating for improved heat management
Implementation Method 4
Configuring said target to comprise a substrate of relatively low-atomic-number ('low-Z') material that carries an array of mutually isolated nuggets of a relatively high-atomic-number ('high-Z') material
Data Source
AI summary
A method, target, and apparatus are disclosed for investigating a specimen using X-ray tomography. The specimen in mounted on a specimen holder. An X-ray target has a substrate of relatively low-atomic-number material carrying an array of mutually isolated nuggets of a relatively high-atomic number material. X-rays are generated by irradiating a single nugget in the target with a charged particle beam, which then illuminates the specimen along a first line of sight through the specimen. A flux of X-rays transmitted through the specimen is detected to form a first image. The illumination process is repeated for a series of different lines of sight through the specimen, to produce a series of images. A mathematical reconstruction on the series of images is then performed to produce a tomogram of at least part of the specimen.