Radiation Detector Auto Exposure Control via Pixel Charge Comparison
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Solution Overview
Problem
Existing radiation detectors require separate devices and complex configurations for auto exposure detection (AED), leading to radiation loss and image degradation due to incomplete reset operations and inefficient exposure control.
Innovation Solution
A radiation detector with a matrix-type radiation detecting unit, gate module, readout module, and auto exposure detecting unit that uses internal logic to autonomously determine radiation exposure through charge comparison, eliminating the need for external devices and optimizing exposure time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate device is added for auto exposure detection, then exposure detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the auto exposure detection function with the existing radiation detector by utilizing the pixel array and readout circuitry already present in the detector. The exposure detection pixel is integrated into the same sensor structure, eliminating the need for separate external detection devices while maintaining detection accuracy.
Solution Approach 2:
The radiation detector is designed to perform multiple functions: it serves both as the primary radiation imaging sensor and as the auto exposure detection device. The pixel array can operate in dual modes - capturing diagnostic images and simultaneously monitoring exposure levels through dedicated exposure detection pixels.
2Manufacturing precision
If reset operation is completed before exposure, then charge quality is improved, but exposure time is lost
Solution Approach 1:
The system performs a quick reset operation on selected line units before exposure, preparing them in advance to receive charges. This preliminary action ensures that the detector is ready for immediate charge accumulation when radiation arrives, improving charge quality without requiring a full reset of all lines.
Solution Approach 2:
Instead of resetting all line units before each exposure, the system selectively resets only the necessary line units. This partial action approach minimizes the reset time and reduces radiation loss while still ensuring adequate charge quality for the exposure operation.
3Loss of energy
If exposure operation starts before reset completion, then radiation loss is reduced, but image quality deteriorates
Solution Approach 1:
The detector is divided into multiple line units that can be independently controlled and reset. This segmentation allows different regions to be in different operational states - some lines being reset while others are already prepared - enabling the system to balance between minimizing radiation loss and maintaining image quality.
Solution Approach 2:
The system dynamically adjusts the reset operation timing for different line units based on their individual readiness status. The exposure operation can proceed as soon as sufficient line units are prepared, creating a flexible, dynamic system that optimizes the trade-off between radiation loss and image quality.
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
Enables rapid and accurate auto exposure detection with reduced radiation loss, minimizing unnecessary subject exposure and improving image quality by effectively utilizing the entire exposure time without separate optical or radiation detection members.
Implementation Method 1
storing charges generated in proportion to irradiation dose of radiation in the plurality of pixels
Data Source
AI summary
Provided is a radiation detector including a radiation detecting unit, a gate module controlling a gate line, a readout module reading out charges stored in an exposure detection pixel determined by a data line and the gate line, and an auto exposure detecting unit determining whether the radiation detecting unit is exposed to a radiation.