Radiation Imaging Offset Correction via Dynamic Mode Switching
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Solution Overview
Problem
Existing radiation imaging apparatus face challenges in performing optimal offset correction processes due to noise components like residual charges, dark current, and afterimages, which degrade image quality and require increased memory and circuit capacity for determination and calculation units.
Innovation Solution
A radiation imaging apparatus with a correction data acquiring unit and a switching unit that acquires and switches acquisition modes based on predetermined imaging modes, allowing for optimal offset correction without increasing memory or circuit scale, by using a switching table to select the appropriate acquisition mode for offset correction data acquisition and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If offset correction data is acquired before capturing radiation images to increase frame rates, then productivity is improved, but measurement precision deteriorates due to insufficient afterimage reduction
Solution Approach 1:
The patent dynamically switches between two offset correction acquisition modes (first mode: acquire before radiation image for high frame rate; second mode: acquire after radiation image for better afterimage reduction) based on the imaging mode being used. This dynamic adaptation allows the system to optimize for either productivity or measurement precision depending on the specific imaging requirements.
2Measurement precision
If determination units and calculation units are added to optimize offset correction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the offset correction acquisition function into a separate, dedicated unit that operates independently from the main imaging pipeline. This extraction allows the offset correction process to be optimized without complicating the core imaging circuitry, as the correction unit can be implemented as a separate module that processes data without adding complexity to the radiation detection and imaging pathways.
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 improved image quality by optimizing offset correction processes based on imaging modes, reducing afterimages and noise, while maintaining memory and circuit efficiency.
Implementation Method 1
a lamination of a scintillator configured to convert radiation into visible light
Implementation Method 2
a solid-state photodetector in which an amorphous semiconductor is sandwiched by a transparent conductive film and a conductive film
Data Source
AI summary
The radiation imaging apparatus includes: a correction data acquiring unit configured to acquire, from image data captured in a predetermined imaging mode, offset correction data corresponding to the predetermined imaging mode; a switching unit configured to switch an acquisition mode for acquiring the image data, depending on the predetermined imaging mode; and an image processing unit configured to subtract the offset correction data from a radiation image of an object to perform an offset correction process.