Radiation Focal Position Detection Using Absorber Segmentation
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Solution Overview
Problem
Current radiation focal position detection methods in radiation tomographic imaging apparatuses, such as multi-slice X-ray CT systems, face challenges in accurately detecting the positional displacement of the radiation focal point due to miniaturization of detecting elements and collimator plates, leading to image artifacts in high-resolution regions.
Innovation Solution
A radiation focal position detecting method that uses a radiation absorber to cover adjacent detecting element regions in a radiation detector, allowing for high-resolution detection of the focal point displacement by analyzing the intensity ratios of radiation received by these regions, with the absorber's width being wider than the collimator plates and positioned to maximize the change in radiation ratios when the focal point moves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If miniaturization of detecting elements and collimator plates is implemented, then the resolution and detail of the radiation detector is improved, but the ability to detect focal point position displacement deteriorates
Solution Approach 1:
The invention divides the detecting element array into multiple regions (first detecting element region, second detecting element region, and third detecting element region) with different functions. The first and second regions are used for focal point position detection, while the third region serves as a reference. This segmentation allows the system to maintain high resolution through miniaturization while preserving the ability to detect focal point displacement through regional comparison.
Solution Approach 2:
The invention introduces a radiation absorber as an intermediary element positioned between the radiation source and the detecting element regions. The absorber creates intentional radiation shielding that enhances the contrast in radiation intensity patterns, making the focal point position more distinguishable against the detector background. This intermediary structure amplifies the detection capability without requiring larger detector elements.
2Measurement precision
If a reference channel method is used to detect focal point position, then the detection capability is maintained, but the resolution becomes insufficient for miniaturized systems
Solution Approach 1:
The invention applies different functional characteristics to different regions of the detecting element array. The first and second detecting element regions are optimized for focal point position detection with specific radiation absorber coverage, while the third region serves as a reference channel. This local differentiation allows each region to be optimized for its specific function, achieving high resolution detection without requiring uniform coverage across the entire detector.
Solution Approach 2:
The invention adds a spatial dimension to the detection approach by positioning the radiation absorber at specific locations relative to the detecting element regions. The absorber creates a three-dimensional radiation intensity distribution pattern that provides additional information for focal point position detection. This dimensional approach enhances detection capability beyond what traditional two-dimensional reference channels can provide.
3Reliability
If collimator plates are used to reduce scattered radiation, then the image quality is improved, but the focal point position error effects are amplified
Solution Approach 1:
The invention implements a feedback mechanism by using the third detecting element region as a reference channel that continuously monitors radiation intensity. The system compares the radiation intensity in the first and second regions against the reference region to detect focal point position displacement in real-time. This feedback information can then be used to correct image data or adjust the radiation source position, compensating for the harmful effects of focal point errors while maintaining the benefits of collimator plate usage.
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 precise detection and correction of radiation focal point position, improving image quality by enhancing the resolution of focal point displacement measurement and reducing the adverse effects of focal point movement on image geometry.
Implementation Method 1
providing a radiation absorber so as to cover parts of first and second detecting element regions... based on the intensities of radiation detected by the detecting elements
Data Source
AI summary
A radiation focal position detecting method for detecting a positional displacement of a focal point of a radiation source in a radiation tomographic imaging apparatus is provided. The method includes providing a radiation absorber that covers parts of first and second detecting element regions, the parts lying on mutually adjoining sides of the first and second detecting element regions in a radiation detector including a plurality of detecting elements arranged in channel and slice directions, and specifying, based on intensities of radiation detected by the detecting elements in the first and second detecting element regions, a position of the focal point or an amount of movement of the focal point from a reference position.