Detector Gain Offset Correction for Radiography Ring Artefacts
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Solution Overview
Problem
Current detector correction methods for radiography are time-consuming and require extensive experience to choose suitable parameters, leading to potential losses in precision and delay in image capture and evaluation, while also being prone to ring artefacts in three-dimensional representations.
Innovation Solution
A method that evaluates the quality of projection images to determine a preferred gain and offset correction by repeatedly modifying the measurement sequence and assessing image quality, allowing for precise correction with minimal time expenditure and reduced ring artefacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detector correction methods are used to ensure sufficient quality of radiographs, then measurement precision is improved, but loss of time increases due to extensive parameter selection requiring experience and repeated adjustments
Solution Approach 1:
The system automatically determines optimal gain and offset correction parameters by having the detector evaluate its own correction quality through repeated measurements and automated parameter optimization, eliminating the need for operator experience and manual parameter selection
Solution Approach 2:
The system implements a feedback loop where the detector performs repeated measurements with different parameter sets, evaluates the quality of correction results, and automatically adjusts parameters based on the evaluation outcomes to achieve optimal correction
2Manufacturing precision
If extensive parameter selection and repeated adjustments are performed to achieve precise detector correction, then manufacturing precision is improved, but productivity deteriorates due to delays in image capture and evaluation
Solution Approach 1:
The system performs preliminary automated parameter optimization and correction quality evaluation before actual image capture, establishing optimal correction parameters in advance to avoid delays during the main imaging process
Solution Approach 2:
The detector system automatically optimizes its own correction parameters and evaluates correction quality without requiring operator intervention, enabling precise calibration to be performed efficiently without impacting overall productivity
3Loss of time
If simple correction methods are used to reduce time expenditure, then loss of time is reduced, but measurement precision deteriorates leading to potential ring artefacts in three-dimensional representations
Solution Approach 1:
The system uses automated feedback loops to evaluate correction quality through repeated measurements and automatically adjusts parameters to eliminate ring artefacts, achieving high precision correction without manual intervention or time loss
Solution Approach 2:
The system replaces manual parameter selection and evaluation with automated computational algorithms that rapidly determine optimal correction parameters and evaluate their effectiveness, achieving both speed and precision
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 rapid and precise determination of suitable gain and offset correction settings, reducing ring artefacts and improving image quality in radiography, thereby enhancing the efficiency and accuracy of detector calibration.
Implementation Method 1
the detector can include a plurality of individual detector elements, which each generate a respective pixel. The detector elements are often configured in a matrix form with detector elements arranged in rows and columns, which in each case detect a radiation value specific to the element
Implementation Method 2
Detectors including, for example, a scintillator and/or photodiodes are used to record depictions of the radiography
Data Source
AI summary
A method for correcting a detector configured to generate object radiographs and an arrangement to implement the method is provided. The method includes the steps of (a) providing the detector having setting values for a gain and offset correction, (b) capturing a plurality of object radiographs of a test object by the detector and generating a reconstructed three-dimensional representation of the test object based on of the object radiographs, (c) determining at least one quality value of the reconstructed three-dimensional representation, repeating the steps (b) and (c) at least once, wherein before the repetition, a parameter set is generated and a measurement sequence is implemented on the basis thereof, at least one setting value for a gain and offset correction of the detector being determined anew based on the measurement sequence; and (e) determining a preferred gain and offset correction based on overall determined quality values.