Radiation Image Pickup System Reset Non-Adjacent Rows
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Solution Overview
Problem
Existing radiation image pickup systems face delays in detecting the start of radiation exposure, leading to artifacts in images due to electric charge accumulation, with current methods either discarding data, reducing resolution, or increasing noise through image addition.
Innovation Solution
A radiation image pickup system that includes a detection unit for identifying the start of exposure, a drive control unit for switching from reset to charge accumulation, and a correction coefficient calculation unit to correct pixel output values using calculated coefficients, ensuring accurate image capture by resetting non-adjacent rows and interpolating data without losing original values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reset process is performed sequentially on scanning lines before radiation exposure, then artifacts can be prevented from appearing on multiple scanning lines, but the detection of radiation exposure start is delayed and artifacts still occur on adjacent lines
Solution Approach 1:
The pixel array is divided into multiple scanning lines that can be reset independently and simultaneously. The detection unit is segmented to detect radiation exposure start independently from the reset operation, allowing parallel processing of reset operations on multiple scanning lines without waiting for sequential completion.
Solution Approach 2:
The reset operation is performed in advance on multiple non-adjacent scanning lines before radiation exposure begins. By performing preliminary reset on n rows simultaneously, the system ensures that pixels are ready to accumulate charge without delay when radiation exposure starts, preventing artifacts while maintaining timely detection.
2Reliability
If image data on scanning lines with artifacts is discarded and replaced by interpolation, then artifacts are repaired, but diagnosis information is lost and resolution is reduced
Solution Approach 1:
The system uses feedback from the detection unit to determine when radiation exposure has started. Based on this feedback, the control unit adjusts the reset operation timing and switches to charge accumulation mode, preventing artifacts from occurring in the first place rather than requiring post-processing repair that would lose diagnostic information.
3Reliability
If two images are added together to repair artifacts, then artifact repair is achieved, but random noise increases by a factor of about √2
Solution Approach 1:
The reset operation is performed in advance on multiple non-adjacent scanning lines before radiation exposure begins. By performing preliminary reset on n rows simultaneously, the system ensures that pixels are ready to accumulate charge without delay when radiation exposure starts, preventing artifacts while maintaining timely detection.
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 high-quality image capture with suppressed artifacts, maintaining resolution and reducing noise, by accurately accounting for charge accumulation and interpolation across rows.
Implementation Method 1
a plurality of pixels arranged in the form of an array and each configured to convert radiation to an electric charge
Data Source
AI summary
A radiation image pickup system includes a correction coefficient calculation unit that calculates a correction coefficient using pixel output values of a plurality of pixels, and a correction unit that corrects pixel output values of a plurality of pixels using the correction coefficient. A drive control unit repeatedly resets an electric charge caused by a dark current of a plurality of pixels until a detection unit detects a start of radiation exposure. The reset operation is performed simultaneously for n rows that are not adjacent to each other, where n is an integer equal to or greater than 2. The correction coefficient calculation unit calculates the correction coefficient using pixel output values of pixels in a row subjected to the reset operation in a period from a start of radiation exposure to a start detection time and pixel output values of pixels in an adjacent row.