X-ray Spectrum Correction Using Shadow Zone Masking
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Solution Overview
Problem
Current methods for medical and industrial X-ray imaging struggle to effectively separate primary radiation from scattered radiation, leading to distorted images due to the influence of scattered radiation, especially in materials with high atomic numbers and low-energy radiation.
Innovation Solution
A method using a pixelated detector and a mask with absorbing elements between the X-ray source and object, where the mask creates shadow zones on the detector, allowing for the estimation and correction of primary radiation spectra by analyzing the difference in radiation spectra within and outside these zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mask with absorbing elements is interposed between the source and object to create shadow zones, then scattered radiation can be estimated and corrected more accurately, but the device complexity increases
Solution Approach 1:
A mask with absorbing elements is introduced as an intermediary component between the X-ray source and the object. This mask creates shadow zones on the detector that allow for the estimation and correction of scattered radiation by providing reference measurements of primary radiation only, thereby improving spectrum correction accuracy without requiring fundamental changes to the imaging system architecture.
Solution Approach 2:
The detector surface is segmented into different regions: shadow zones where only primary radiation reaches (blocked by mask elements) and non-shadow zones where both primary and scattered radiation reach. This segmentation allows for separate measurement and correction of scattered radiation components, improving measurement precision through regional analysis.
2Measurement precision
If spectral imaging is used to acquire radiation data according to different energy bands, then the ability to correct and separate primary and scattered radiation improves, but the processing complexity and time increase
Solution Approach 1:
The imaging system transitions from conventional two-dimensional spatial imaging to three-dimensional spectral imaging by adding energy band discrimination. The pixelated detector measures radiation intensity across multiple energy bands simultaneously, creating spectral signatures that enable differentiation between primary and scattered radiation based on their distinct energy distribution patterns, thereby improving measurement precision through spectral analysis.
3Measurement precision
If the mask attenuates primary radiation to estimate scattered radiation alone, then scattered radiation can be measured directly, but the quantity of useful primary radiation information is reduced
Solution Approach 1:
The mask is designed with localized absorbing elements that create discrete shadow zones on the detector rather than uniform attenuation across the entire field. This local quality approach allows primary radiation to reach most of the detector (preserving quantity), while specific shadow zone regions provide the necessary conditions for scattered radiation estimation through comparison with adjacent non-shadow regions.
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 enables accurate correction of spectra to isolate primary radiation, providing a more faithful representation of radiation attenuation by the object, thereby improving image interpretation and reducing the impact of scattered radiation.
Implementation Method 1
a mask being interposed between the source and the object, the mask comprising absorbing elements, able to attenuate a part of said incident radiation
Implementation Method 2
Current detectors make it possible to obtain two-dimensional images... A recent development is the appearance of detectors allowing the acquisition of spectral images... These detectors, frequently based on semiconductor detectors having a spectrometric function
Implementation Method 3
The radiation transmitted by the object generally includes a component resulting from the scattering, by the object, of the radiation emitted by the source
Implementation Method 4
This image is representative of the attenuation, by the object, of the radiation emitted by the source
Data Source
Figure 1A~1B
Figure 1C~2C
Figure 3A
AI summary
The invention relates to a method for processing the energy spectra of radiation transmitted by an object irradiated by a source of ionizing radiation, particularly X-rays, for applications in medical imaging or non-destructive testing. The method employs a detector comprising a plurality of pixels, each pixel capable of acquiring a spectrum of the radiation transmitted by the object. From a plurality of detected spectra, the method establishes a spectrum, called the scattering spectrum, representative of the radiation scattered by the object. Each acquired spectrum is corrected by taking into account the scattering spectrum thus established. The invention reduces the influence of scattering by the object on the spectrum emitted by the source.