Radiation Detector Reset Timing for Exposure Accuracy
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Solution Overview
Problem
Conventional radiation image capturing apparatuses face accuracy issues in detecting radiation due to variations in the time from pixel reset to readout, leading to inconsistencies in charge readout and reduced accuracy of radiation exposure measurement.
Innovation Solution
A radiation image capturing apparatus with a processor that performs a first reset operation and detects radiation exposure based on signals from detection elements, ensuring consistent and accurate readout of radiation levels by controlling the reset and readout operations to minimize the impact of dark current charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sequential row-by-row reset operation is performed for all pixels, then the reset operation can be completed systematically, but the time from last resetting to first signal readout varies in detection pixels, causing variation in dark current charges and decreasing measurement accuracy
Solution Approach 1:
The patent applies preliminary action by performing a dedicated reset operation on detection pixels immediately before radiation exposure begins. This ensures that the time from resetting to readout is consistent and known, eliminating dark current variation effects. The reset operation is performed in advance on specific detection pixels that will be used for exposure detection, rather than sequential row-by-row resetting of all pixels.
2Productivity
If immediate readout operation is performed after sequential reset, then productivity is maintained, but the variation in reset-to-readout time causes inconsistency in charge readout
Solution Approach 1:
The patent applies local quality by treating detection pixels differently from other pixels in the array. Detection pixels receive a specific reset operation immediately before exposure, while other pixels follow the常规 sequential reset procedure. This localized treatment ensures that detection pixels have consistent reset-to-readout timing without significantly impacting the overall operation speed of the entire pixel array.
3Reliability
If reset operation is performed repeatedly in predetermined cycle for all pixels, then dark current charges are removed, but the systematic sequential approach causes timing variation in detection pixels
Solution Approach 1:
The patent performs a preliminary reset operation specifically on detection pixels immediately before radiation exposure starts. This preliminary action ensures that dark current charges are removed from detection pixels at a known, consistent time point, eliminating the timing variation problem caused by sequential row-by-row resetting while maintaining effective dark current removal.
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 enhances the accuracy of radiation exposure detection by synchronizing reset and readout operations, reducing the influence of dark current variations and improving the reliability of radiation measurement.
Implementation Method 1
a conversion element which converts radiation into charges
Data Source
AI summary
A radiation image capturing apparatus is provided. The radiation image capturing apparatus includes an image capturing unit configured to capture a radiation image. The image capturing unit includes a detection element configured to detect radiation. The radiation image capturing apparatus comprises a processor configured to perform, in accordance with an exposure request from a user, a first reset operation of resetting the detection element, and configured to detect an amount of irradiation of the radiation based on a signal from the detection element after the first reset operation.