X-Ray Image Afterglow Correction Using Predictive Dark Frames
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Solution Overview
Problem
Existing X-ray imaging technologies suffer from afterglow effects, particularly in high-dose to low-dose transitions, leading to inaccurate image mapping and increased patient exposure due to the need for dark images to correct afterglow, which reduces dose efficiency and temporal resolution.
Innovation Solution
A computer-implemented method that utilizes a series of dark images captured during non-exposure intervals to predict and correct afterglow values by analyzing temporal derivatives of image data, allowing for accurate afterglow compensation without interrupting imaging sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dark images are recorded to correct afterglow effects, then image accuracy is improved, but dose efficiency deteriorates and temporal resolution is reduced
Solution Approach 1:
The system performs preliminary actions by capturing dark images during non-exposure intervals to characterize afterglow decay behavior before it affects subsequent measurements. This allows the afterglow correction to be prepared in advance without interrupting the main imaging sequence, thereby maintaining dose efficiency while improving image accuracy through predictive correction.
Solution Approach 2:
The system uses feedback from dark images captured during non-exposure intervals to continuously characterize and update the afterglow decay model. This feedback mechanism allows the system to adapt to varying afterglow conditions and improve correction accuracy without requiring continuous interruption of the imaging sequence, thus maintaining both image accuracy and dose efficiency.
2Measurement precision
If dark images are recorded to correct afterglow effects, then image accuracy is improved, but temporal resolution deteriorates
Solution Approach 1:
The system captures dark images during non-exposure intervals that occur naturally in the imaging sequence, performing the afterglow characterization action in advance before it is needed. This preliminary action eliminates the need to interrupt the main imaging sequence, thereby maintaining temporal resolution while improving image accuracy through predictive afterglow correction.
Solution Approach 2:
The system maintains continuity of useful action by capturing dark images during existing non-exposure intervals rather than introducing additional interruptions. This allows the afterglow correction process to continue alongside the main imaging sequence without breaking temporal resolution, achieving both image accuracy and temporal resolution simultaneously.
3Measurement precision
If deconvolution is used to remove afterglow, then short-term afterglow is compensated, but long-lasting afterglow cannot be adequately corrected
Solution Approach 1:
The system performs preliminary characterization of afterglow decay by capturing dark images during non-exposure intervals, building a temporal profile of the afterglow behavior before it affects subsequent measurements. This preliminary action enables the system to predict and correct long-lasting afterglow effects accurately, as the decay characteristics are established in advance without requiring continuous interruption of the imaging sequence.
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 method effectively corrects afterglow effects in X-ray images, improving dose efficiency and temporal resolution while reducing patient exposure by accurately predicting and subtracting afterglow values, even in long-lasting afterglow scenarios.
Implementation Method 1
charges accumulating, for example, in defective areas of the scintillator or the sensor's photodiode following prior X-radiation
Implementation Method 2
defective areas of the scintillator or the sensor's photodiode
Data Source
AI summary
A method for correcting an X-ray image that is based on imaging during a first time interval and indicates a respective X-ray image value for at least one image point includes receiving a plurality of dark images. A respective dark image is based on image data capturing during a respective subinterval of a second time interval preceding the first time interval, during which no X-rays are irradiated onto an X-ray detector, and indicates a respective dark image value for the respective image point. A respective afterglow value is predicted for the respective image point in the X-ray image, in dependence on the dark image values of a plurality of the dark images for the respective image point. The X-ray image is corrected by ascertaining a respective corrected X-ray image value for the respective image point in dependence on the respective X-ray image value and the respective afterglow value.