Radiation Imaging Pixel Readout for AEC Artifact Suppression
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Solution Overview
Problem
Existing radiation imaging apparatuses with automatic exposure control (AEC) function suffer from suboptimal image quality after automatic exposure control, particularly due to artifacts and inconsistencies in image signal characteristics.
Innovation Solution
The radiation imaging apparatus includes a pixel unit with distinct types of pixels for detection and correction, and a control unit that sequentially supplies driving signals to non-detection lines after radiation emission, allowing for accurate signal reading and interpolation to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If driving signals are supplied to all driving lines sequentially after radiation emission, then image quality is improved through stable signal characteristics, but reading time is extended
Solution Approach 1:
The patent applies preliminary action by supplying driving signals to all driving lines sequentially after radiation emission ends, before the actual image reading process. This preliminary signal supply stabilizes the image signal characteristics and reduces artifacts, thereby improving image quality without significantly impacting the overall reading time
Solution Approach 2:
The patent implements periodic action through the sequential supply of driving signals to each driving line in a systematic order. By periodically activating each driving line after radiation emission, the system ensures stable signal characteristics while maintaining an efficient reading sequence that minimizes time loss
2Use of energy by moving object
If automatic exposure control is performed during radiation emission, then radiation dose is optimized, but image signal characteristics become unstable
Solution Approach 1:
The patent applies preliminary action by performing automatic exposure control during radiation emission, then subsequently supplying driving signals to all driving lines before image reading. This two-stage approach allows radiation dose optimization during emission while stabilizing image signal characteristics in the subsequent phase, resolving the stability issue
Solution Approach 2:
The patent segments the imaging process into distinct phases: radiation emission with AEC control, post-emission driving signal supply to all lines, and final image reading. This segmentation allows each phase to be optimized independently, maintaining radiation dose efficiency while ensuring image signal stability
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 image quality by reducing artifacts and stabilizing image signal characteristics, resulting in higher accuracy and consistency of radiation images.
Implementation Method 1
a pixel unit including a plurality of elements arranged in a matrix and configured to generate charges based on emission of radiation
Data Source
AI summary
A radiation imaging apparatus having a function of detecting a start and an end of emission of radiation and an amount of emission of radiation includes a plurality of pixels configured to generate signals according to a dose of radiation, signal lines connected to the plurality of pixels, a reading circuit configured to read the signals from the pixels via the signal lines and generate values according to the signals, and a control unit configured to control an operation of the reading circuit. A row including a pixel from which a signal has been read during the emission of radiation is not read when a diagnosis image is generated.