Radiation Detector Threshold Setting for AEC Accuracy
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Solution Overview
Problem
Existing radiation imaging systems face challenges in accurately transferring automatic exposure control (AEC) parameters from an AEC sensor to a radiation detector, requiring complex work and affecting the precision of AEC in radiation imaging.
Innovation Solution
A radiation imaging apparatus with a pixel array that detects radiation and a notifying unit to set threshold values based on pixel values from initial radiation imaging, allowing for precise automatic exposure control in subsequent imaging sessions, enabling accurate reflection of AEC sensor control by the radiation detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AEC parameters are transferred from AEC sensor to radiation detector, then automatic exposure control accuracy is improved, but the complexity of parameter transfer and system integration increases
Solution Approach 1:
The patent uses pixel values from the radiation detector as a copy of the AEC sensor data to determine threshold values. Instead of directly transferring complex AEC parameters from the AEC sensor, the system captures equivalent information through the radiation detector's pixel array, simplifying the integration process while maintaining accuracy.
Solution Approach 2:
The radiation detector acts as an intermediary between the AEC sensor and the control system. By using the radiation detector's pixel values to infer threshold values, the system avoids direct complex parameter transfers and uses the detector as a mediating element to achieve accurate AEC control.
2Measurement precision
If threshold values are set based on pixel values from initial radiation imaging, then automatic exposure control precision is improved, but the time required for initial calibration increases
Solution Approach 1:
The system performs preliminary radiation imaging to capture pixel values that will be used for determining threshold values in subsequent imaging. This preliminary action establishes the basis for accurate AEC control while allowing the actual imaging to proceed efficiently using the pre-determined thresholds.
Solution Approach 2:
The system performs a single initial radiation imaging to obtain pixel values for threshold determination, rather than requiring multiple calibration shots. This partial action approach achieves sufficient accuracy without excessive time investment, balancing calibration thoroughness with operational efficiency.
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 solution ensures high-accuracy automatic exposure control by setting threshold values based on pixel values, allowing for precise control of radiation exposure, even when manufacturers of radiation generating and imaging apparatuses differ, thereby improving the overall precision and ease of integration of AEC systems.
Implementation Method 1
a radiation detector (for example, a sensor panel) that detects radiation, such as X-ray, as an electric signal
Data Source
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AI summary
The radiation imaging apparatus is provided that includes a radiation detector including a pixel array in which a plurality of pixels being capable of detecting radiation as electric signals are arranged, the radiation transmitted through an AEC sensor used for performing automatic exposure control of radiation irradicated from a radiation generating apparatus, a notifying unit for performing threshold value reached notification to the radiation generating apparatus, if a dose value of the radiation incident on the pixel array reaches a threshold value, and a threshold value setting unit for setting the threshold value in second radiation imaging in which automatic exposure control of the radiation by the radiation detector is performed after first radiation imaging in which the automatic exposure control of the radiation by the AEC sensor is performed, based on pixel values related to the electric signals detected by the plurality of pixels in the first radiation imaging.