Radiation Imaging Pixel Noise Correction via Preliminary Action
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Solution Overview
Problem
The reduction in radiation dose incident on a radiation imaging apparatus leads to decreased signal amounts, resulting in a lower signal-to-noise ratio and increased noise output from pixels, which affects the accuracy of radiation dose detection.
Innovation Solution
A radiation imaging apparatus with a control unit that manages a detection cycle for a second pixel to accurately determine and correct the radiation dose, taking into account noise output, allowing for precise radiation dose detection and optimal exposure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the radiation dose incident on the radiation imaging apparatus is reduced, then the exposure amount decreases, but the signal amount decreases and the S/N ratio deteriorates, increasing noise output from pixels
Solution Approach 1:
The patent applies preliminary action by measuring the noise output from each pixel before irradiation with radiation. The control unit stores noise information for each pixel in advance, based on detection cycles determined from irradiation information. When irradiation occurs, the control unit corrects the radiation dose by referencing these pre-measured noise values, thereby compensating for noise effects even at low radiation doses without requiring real-time noise measurement during exposure.
2Measurement precision
If the detection cycle is extended to improve dose detection accuracy, then the measurement precision improves, but the time required for detection increases
Solution Approach 1:
The patent performs noise measurement and stores noise information for each pixel in advance, before actual irradiation occurs. By determining detection cycles based on irradiation information beforehand and storing the corresponding noise characteristics, the system eliminates the need for extended real-time detection during exposure. The correction process uses pre-acquired noise data, significantly reducing the time required for accurate dose detection while maintaining measurement precision.
3Measurement precision
If noise correction is performed for each pixel to improve dose detection accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent implements self-service by having each pixel serve its own noise characterization function. The second pixel measures noise output and stores it in the control unit, creating a self-contained noise profile for each pixel. During dose detection, each pixel's noise-corrected signal is processed independently using its own stored noise information. This distributed approach achieves accurate per-pixel noise correction without requiring complex centralized processing, as each pixel essentially corrects its own measurements using pre-acquired noise data.
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 dose detection and improves image quality by effectively managing noise and exposure, ensuring accurate radiation imaging even at low doses.
Implementation Method 1
a conversion element which converts radiation into electric charge
Data Source
AI summary
A radiation imaging apparatus is provided. The apparatus comprises first pixels arranged in an image sensing region to obtain a radiation image, a second pixel configured to obtain a dose of incident radiation and a control unit configured to control the first pixels and the second pixel. The control unit causes the first pixels to accumulate charge corresponding to a radiation dose, while causing the second pixel to operate in a detection cycle determined based on irradiation information of radiation before irradiation with radiation, obtains a dose of incident radiation for each detection cycle, and corrects the obtained radiation dose in accordance with an amount of noise output from the second pixel operating in the detection cycle.