Radiation Imaging Detector Dark-Current Correction for Row Artifacts
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Solution Overview
Problem
Existing radiation imaging systems using flat panel detectors face issues with step-shaped artifacts due to changing dark current components over time, particularly in interlaced scan methods, leading to decreased image quality.
Innovation Solution
A radiation imaging apparatus that includes a radiation detector with a matrix of pixels and controllers to acquire output information with and without radiation, using adjusted accumulation periods to correct for dark current components, ensuring balanced charge accumulation times to reduce artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reset operation is performed using interlaced scan method, then the scanning efficiency is improved, but step-shaped artifacts appear more prominently due to dark current changes over time
Solution Approach 1:
The patent applies preliminary action by performing an accumulation operation for a predetermined period before the reset operation to capture dark current components. This pre-captured dark current data is then used to correct the image data, preventing step-shaped artifacts from appearing in the final image while maintaining the efficiency of interlaced scan method
2Ease of operation
If the accumulation period is not adjusted for dark current correction, then the operation is simplified, but step-shaped artifacts are generated in rows before and after the radiation detection row
Solution Approach 1:
The patent applies local quality by adjusting the accumulation period specifically for the correction image data acquisition. The accumulation operation is performed for a predetermined period to capture dark current components, while the imaging operation uses a different accumulation period. This localized adjustment of accumulation timing for correction purposes eliminates step-shaped artifacts without complicating the overall operation
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 solution effectively reduces step-shaped artifacts by aligning dark current components across rows, resulting in improved image quality and fine radiation images.
Implementation Method 1
a radiation detector including a plurality of pixels arranged in a matrix and configured to output a signal based on a charge accumulated in the plurality of pixels
Data Source
AI summary
A radiation imaging apparatus includes a radiation detector and one or more controllers being configured to acquire first output information and then acquire second output information being information about a charge accumulated in a plurality of pixels without radiation irradiation on the radiation detector, the first output information being information about the charge accumulated in the plurality of pixels with radiation irradiation on the radiation detector, wherein the first output information and the second output information are information for acquiring a corrected radiation image, and wherein an output value of a predetermined row that is included in the first output information is an output value of the charge accumulated over a first period, and an output value of the predetermined row that is included in the second output information is an output value of the charge accumulated over a second period, the second period being longer than the first period.