Radiation Image Detector Dual Sampling Cycle Emission Start Judgment
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Solution Overview
Problem
Conventional X-ray image detecting devices face challenges in achieving both high responsivity and high precision in emission start judgment, as improving one aspect typically impairs the other, especially with the need for short emission times and low X-ray doses.
Innovation Solution
A radiation image detecting device with a panel unit, radiation detector, dose sampling unit, and emission start judgment unit, which performs a two-step judgment process with different sampling cycles for the first and second judgment processes, allowing the second sampling cycle to be longer than the first, thereby enhancing signal value and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sampling cycle of the dose signal is shortened to improve responsivity and detect emission start quickly, then the detection speed improves, but the signal value obtained in one-time sampling decreases, reducing measurement precision
Solution Approach 1:
The emission start judgment is divided into two separate processes: a first judgment process using a short sampling cycle to detect emission start quickly, and a second judgment process using a long sampling cycle to verify the judgment with high precision. This segmentation allows each process to optimize for its specific function without compromise.
Solution Approach 2:
The sampling cycle is made dynamic and adaptive - the system automatically switches between a short sampling cycle (first sampling cycle) during the first judgment process and a long sampling cycle (second sampling cycle) during the second judgment process. This dynamic adjustment optimizes both detection speed and measurement precision at different stages of the judgment workflow.
2Device complexity
If a single sampling cycle is used for both judgment processes, then the system structure remains simple, but it cannot simultaneously achieve high responsivity and high precision in emission start judgment
Solution Approach 1:
The system changes the sampling cycle parameter between different judgment processes. The sampling cycle is set to a first value (short duration) for the first judgment process and a second value (long duration) for the second judgment process. This parameter change enables the system to achieve both high responsivity and high precision without requiring complex additional hardware.
3Measurement precision
If the sampling cycle is extended to increase signal value and precision, then measurement accuracy improves, but the detection speed decreases and emission start cannot be identified timely
Solution Approach 1:
The first judgment process using the short sampling cycle performs a preliminary detection of emission start before the second judgment process with the long sampling cycle confirms it. This preliminary action ensures that emission start is detected quickly without waiting for the longer sampling cycle to complete, thus minimizing detection time while maintaining precision through subsequent verification.
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 enables the device to meet the requirements for both high responsivity and high precision in emission start judgment, effectively handling short emission times and low X-ray doses by optimizing the sampling cycles and threshold values.
Implementation Method 1
a radiation detector to detect the radiation
Implementation Method 2
a panel unit having a two dimensional array of pixels each for producing and accumulating signal charge in accordance with radiation emitted from a radiation source
Data Source
AI summary
To provide a radiation image detecting device providing high responsivity and high precision of an emission start judgment, an electronic cassette has a panel unit and a control unit. The panel unit has a two-dimensional array of normal pixels for accumulating signal charge upon receiving X-rays and detection pixels for detecting the X-rays. A signal processing circuit periodically samples a dose signal, corresponding to an X-ray dose per unit of time, from the detection pixels. An emission start judgment unit performs based on the dose signals of the detection pixels a first judgment process for judging whether X-ray emission has been started, and a second judgment process for judging whether a result of the first judgment process is correct. The control unit sets a second sampling cycle SP2 used in the second judgment process longer than a first sampling cycle SP1 used in the first sampling process.