Radiation Imaging Pixel Segmentation for Dose Control
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Solution Overview
Problem
Existing radiation imaging apparatuses face challenges in accurately controlling radiation irradiation stop and maintaining image quality, as techniques either leave no signal in detection pixels or stop irradiation prematurely, leading to defective dose information and degraded image quality.
Innovation Solution
A radiation imaging apparatus with a matrix arrangement of pixels, including first and second kinds of pixels, performs cumulative dose detection and processing based on threshold conditions to accurately control irradiation stop, ensuring sufficient dose information is retained for image correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the irradiation stop timing notification is transmitted before the irradiation stop timing to account for delay time, then the irradiation stop control accuracy is improved, but the dose information in the detection pixel becomes defective and image quality degrades
Solution Approach 1:
The pixel array is divided into two distinct types: first kind of pixels for image detection and second kind of pixels for dose detection. This segmentation allows independent optimization of each function - image pixels capture the radiation image while dose pixels monitor cumulative dose without compromising image quality
Solution Approach 2:
The second kind of pixel acts as an intermediary element that performs dose detection without affecting the primary image detection function. By using a separate pixel type for dose monitoring, the system obtains accurate dose information while preserving image quality in the first kind of pixels
2Loss of information
If the switching element is turned off to leave dose information in the detection pixel, then the dose information is preserved, but the irradiation cannot be stopped timely and image quality degrades
Solution Approach 1:
By segmenting the pixel array into first kind (image detection) and second kind (dose detection) pixels, the system can continuously read out dose information from second kind pixels without turning off switching elements, enabling timely irradiation stop control while preserving dose information
Solution Approach 2:
The second kind of pixels autonomously perform dose detection and can be read out independently without requiring switching element manipulation. This self-service capability allows continuous monitoring and immediate irradiation stop when dose threshold is reached, eliminating the need to turn off switching elements
3Measurement precision
If the dose detection operation continues until comparison with threshold is completed, then the dose information accuracy is improved, but the irradiation stop timing is delayed and image quality degrades
Solution Approach 1:
The dose detection operation in second kind of pixels continues continuously throughout irradiation without interruption for threshold comparison. Cumulative dose information is constantly updated and can be immediately compared with threshold, eliminating delays while maintaining accuracy
Solution Approach 2:
The second kind of pixels continuously accumulate and store dose information independently during irradiation. When irradiation stops, the accumulated dose data is immediately available for comparison with threshold, eliminating the need for continuous comparison operations during irradiation and reducing time delays
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 enables high-accuracy irradiation stop control and reduces image quality degradation by ensuring sufficient dose information is maintained in detection pixels, thereby improving the overall quality of radiation images.
Implementation Method 1
a radiation imaging apparatus comprising a flat panel detector (FPD) including a semiconductor material
Data Source
AI summary
A radiation imaging apparatus comprising: a radiation detecting panel including a plurality of pixels including a first kind of pixel and a second kind of pixel; a unit that obtains a cumulative dose information by performing dose detecting operation for reading charge of the second kind of pixel a plurality of times in a situation where radiation is irradiated and charge is accumulated in the first kind of pixel; a unit that performs processing of stopping the dose detecting operation and stopping the irradiation of radiation based on a combination of a first threshold condition and the cumulative dose information or a combination of a second threshold condition and the cumulative dose information; and a unit that reads the charge of each of the first kind of pixel and the second kind of pixel and obtains a radiation image.