Flexible Radiography Substrate Vibration Noise Filtering
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Solution Overview
Problem
Radiography apparatuses with flexible resin substrates face challenges in distinguishing between radiation signals and noise caused by vibration, leading to incorrect determination of radiation emission due to lower natural frequency and increased noise frequency from impact.
Innovation Solution
A radiography apparatus with a flexible resin substrate, including imaging pixels, a detection unit, and a mode change controller that switches operation modes based on the rate of change and level of electric signals, utilizing a scintillator and support member to maintain a natural frequency of the structure at or below 1 kilohertz, and employing a program to function as the mode change controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a flexible resin substrate is used instead of a glass substrate, then the size, weight, and cost of the apparatus are reduced, but the natural frequency of the substrate decreases and vibration noise increases
Solution Approach 1:
The patent changes the material parameter from glass to flexible resin substrate, which reduces weight and cost but also reduces natural frequency. This parameter change is accepted with the understanding that it introduces vibration noise that must be compensated for through signal processing.
Solution Approach 2:
The patent converts the harmful effect of vibration noise into a useful signal characteristic. By analyzing the frequency content and temporal pattern of the noise, the system can distinguish vibration-induced signals from actual radiation signals, thereby using the noise characteristics to improve radiation detection accuracy.
2Adaptability or versatility
If the natural frequency of the substrate structure is reduced to 1 kHz or below, then the flexibility and weight are improved, but the frequency of vibration noise from impact increases
Solution Approach 1:
The patent explicitly addresses mechanical vibration by analyzing the frequency characteristics of signals generated during impact. By understanding the vibration behavior of the flexible substrate, the system can filter out noise frequencies that occur during impact while preserving actual radiation signals.
Solution Approach 2:
The patent uses feedback from signal analysis to determine whether an impact has occurred. By monitoring signal characteristics and comparing them against expected vibration patterns, the system can identify impact events and adjust its radiation detection accordingly, preventing false positives.
3Speed
If the radiography apparatus determines radiation emission based on electric signal level alone, then the detection speed is improved, but false determination occurs due to vibration noise
Solution Approach 1:
The patent performs preliminary analysis of signal characteristics before making a radiation detection determination. By examining multiple signal properties (level, rate of change, frequency content) in advance, the system can distinguish between vibration noise and actual radiation signals, ensuring accurate detection while maintaining rapid response.
Solution Approach 2:
The patent applies multiple levels of signal analysis beyond a simple threshold check. Instead of relying solely on electric signal level, the system also evaluates rate of change and frequency characteristics, using excessive analysis to ensure accurate differentiation between noise and genuine radiation signals.
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 provides resistance to noise-generated errors, reduces time lag in switching to accumulation mode, ensures accurate radiation emission determination, and reduces the size, weight, and cost of the apparatus while maintaining image data generation capabilities.
Implementation Method 1
a scintillator, an X-ray image detection device main body including a light detection unit that is provided on the X-ray incident side of the scintillator
Implementation Method 2
The light detection unit includes a thin film portion that detects fluorescence as an electric signal
Data Source
AI summary
The radiography apparatus includes: a plurality of imaging pixels that are provided on a resin substrate having flexibility, are used to capture a radiographic image; a detection unit; an accumulation controller that performs control such that the charge generated in each of the imaging pixels is accumulated in the imaging pixel in a case in which an operation mode is an accumulation mode; and a mode change controller that performs control such that the operation mode of the accumulation controller is changed to the accumulation mode in a case in which a rate of change in a level of an electric signal based on the charge generated in the detection unit per hour or an amount of change in the level of the electric signal per hour is greater than a first threshold value and the level of the electric signal is greater than a second threshold value.