Spectrum Correction Using Attenuation Masks
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Solution Overview
Problem
Current methods for X-ray imaging in medical and industrial fields struggle to effectively separate primary and scattered radiation, leading to distorted images due to the interference 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 attenuating elements between the radiation source and object to acquire and correct spectra, applying a transition matrix to estimate and subtract scattered radiation from the detected radiation, allowing for the extraction of primary radiation in multiple energy bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mask with attenuating elements is interposed between the source and the object to separate primary and scattered radiation, then the accuracy of spectrum correction is improved, but the device complexity increases
Solution Approach 1:
A mask with attenuating elements is introduced as an intermediary component between the radiation source and the object. This mask selectively attenuates scattered radiation while allowing primary radiation to pass through, enabling the separation of radiation components without directly interacting with the object itself. The mask acts as a mediator that facilitates the extraction of primary radiation spectra for accurate correction.
2Adaptability or versatility
If spectral imaging is used to obtain images according to different energy bands, then the capability to correct scattering radiation is improved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into multiple energy bands using spectral imaging capabilities. The detector is configured to resolve radiation into different energy bands, allowing separate analysis and correction of scattering radiation at each energy level. This segmentation enables the scattering correction method to be applied across multiple energy bands simultaneously, improving the overall capability while maintaining manageable system complexity through software-based spectral decomposition.
3Measurement precision
If the mask is used to attenuate primary radiation for scattering estimation, then the ability to estimate scattered radiation is improved, but the loss of primary radiation signal increases
Solution Approach 1:
The mask is designed with spatially varying attenuation properties, where different regions of the mask provide different attenuation levels. This local quality variation allows the mask to selectively attenuate scattered radiation in specific regions while preserving primary radiation signals in other regions. The varying attenuation characteristics enable optimized scattering estimation while minimizing the loss of primary radiation signal across the detection area.
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 significantly improves image quality by isolating primary radiation, reducing the influence of scattered radiation and enhancing spatial resolution, as demonstrated by simulations and experimental results.
Implementation Method 1
the mask comprising attenuating elements, configured to attenuate a part of said incident radiation
Implementation Method 2
a scattering radiation, caused by the scattering of the incident radiation in the object
Data Source
AI summary
The invention relates to a method for processing energy spectra of a radiation transmitted by an object irradiated by a source of ionizing radiations, in particular an X radiation, for applications in medical imaging or non-destructive inspection. The method implements a detector comprising a plurality of pixels, each pixel being able to establish a spectrum of the radiation transmitted by the object. The method makes it possible, from a plurality of spectra detected, to establish so-called corrected spectra. Each corrected spectrum is an estimation of the spectrum of a radiation, called primary radiation, transmitted by the object. The invention makes it possible to reduce the influence of the scattering, by the object, of the spectrum emitted by the source.