Radiation Imaging Signal Processing for Energy Resolution Correction
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Solution Overview
Problem
Radiation imaging apparatuses with semiconductor detectors face a decrease in energy resolution due to insufficient correction for secondary radiation, leading to errors in energy discrimination and image quality.
Innovation Solution
A radiation imaging system that includes a detector with a conversion unit and a signal processing unit using a correction coefficient based on a pixel value obtaining process model to correct pixel values and suppress the decrease in energy resolution, accounting for secondary radiation and other noise sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a correction method based only on secondary radiation error is applied, then some error reduction is achieved, but the energy resolution decrease is not sufficiently suppressed
Solution Approach 1:
The patent changes the parameters of the correction method by introducing a comprehensive error model that includes not only secondary radiation error but also other error sources such as statistical fluctuations and detector response variations. This allows for a more accurate correction that sufficiently suppresses energy resolution decrease
Solution Approach 2:
The patent introduces an intermediary error model that mediates between the measured values and the corrected values. This error model acts as a bridge that accounts for multiple error sources, enabling more reliable correction of pixel values to maintain energy resolution
2Ease of operation
If a simple correction coefficient method is used, then the processing is simple, but the correction is insufficient for multiple error sources
Solution Approach 1:
The patent creates a universal correction coefficient method that handles multiple error sources through a unified approach. The error model and correction coefficients are designed to be applicable across different energy levels and detection conditions, providing both simplicity and comprehensive correction accuracy
Solution Approach 2:
The patent optimizes the parameters of the correction method by deriving correction coefficients that account for multiple error sources while maintaining computational efficiency. This allows the system to achieve accurate correction without excessive processing complexity
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
The system effectively suppresses the decrease in energy resolution, improving the accuracy of energy-discriminated radiographic images by correcting for errors caused by secondary radiation and other noise factors.
Implementation Method 1
a conversion unit configured to convert incident radiation photons into optical photons or charges
Data Source
AI summary
An energy resolution decrease in a radiation imaging apparatus is suppressed. The apparatus includes a detector including a conversion unit configured to convert incident radiation photons into optical photons or charges, a pixel array including pixels arranged in a two-dimensional matrix and configured to obtain a pixel value in accordance with the optical photons or charges, and an output circuit including a plurality of output channels configured to output the pixel value from the pixel array, and a signal processing unit configured to perform signal processing of correcting the pixel value by using a correction coefficient in accordance with a pixel value obtaining process model in which a process of obtaining the pixel value output from the pixel array via the plurality of output channels on the basis of the optical photons or charges is modeled and obtaining an energy-discriminated radiographic image based on the corrected pixel value.