Radiation Image Capturing Apparatus Noise Correction
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Solution Overview
Problem
Radiation image capturing apparatuses face challenges in reducing horizontal streak noise and offset component variations during moving image capture, leading to potential errors in image diagnosis due to increased noise offset components over time.
Innovation Solution
A radiation image capturing apparatus with a noise detector that estimates and subtracts noise data based on prior frame image data, using an estimator to calculate offset components and correct image data in real-time, thereby reducing the influence of horizontal streak noise and offset variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a noise detector is used to detect voltage noise in reverse bias voltage, then horizontal streak noise can be reduced, but the offset component of the noise detector increases over time during moving image capture
Solution Approach 1:
The patent implements a feedback mechanism where the noise detector continuously monitors the reverse bias voltage noise, and the system uses this detected noise information to correct image data in real-time. The offset component is updated based on detected noise levels, creating a closed-loop system that adapts to changing conditions during moving image capture.
Solution Approach 2:
The patent applies preliminary correction by detecting and storing the offset component before it significantly degrades image quality. The system proactively measures the noise offset and prepares correction data in advance, allowing subsequent image frames to be corrected using this pre-measured offset information.
2Reliability
If noise correction is applied using detected voltage noise, then image quality improves, but processing complexity increases
Solution Approach 1:
The patent extracts the noise detection function into a separate dedicated noise detector component that operates independently from the main imaging system. This modular approach allows noise correction processing to be handled by a specialized subsystem, simplifying the overall system architecture while maintaining correction capability.
Solution Approach 2:
The patent creates a copy of the noise detection pathway that parallels the main imaging pathway. The noise detector processes the reverse bias voltage separately, and this noise information is then used to correct the main image data without interfering with the primary imaging function.
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 apparatus effectively minimizes the impact of noise offset components on moving image capture, ensuring accurate and reliable image data by continuously correcting for noise variations, thus preventing erroneous diagnoses.
Implementation Method 1
so-called indirect-type radiation image capturing apparatuses each converting emitted radiation into another electromagnetic wave (visible light or the like) having a different wavelength using a scintillator and then generating electric charge according to the energy of the converted electric wave so as to be converted into an electric signal by using a photoelectric conversion device such as a photodiode
Implementation Method 2
in the intersection of the bias line 9 and the connecting wire 10 and the signal line 6, electric charge corresponding to an electric potential difference V0−Vbias between the reference voltage V0 of the signal line 6 and the reverse bias voltage Vbias of the bias line 9 and the connecting wire 10 is generated due to parasitic capacitance thereof
Data Source
AI summary
A radiation image capturing apparatus that generates a plurality of frame images includes: radiation detecting devices that are arranged on a substrate and can generate electric charge; a voltage applying part that applies a reverse bias voltage to the radiation detecting devices; the data reading part that reads image data; and a noise detector that detects a voltage noise of the reverse bias voltage and outputs data, wherein the data reading part includes: an estimator that estimates an offset component; a noise data calculator that calculates noise data on the basis of the data output by the noise detector and the offset component estimated by the estimator; and an image correcting part that generates image data after correction by subtracting the noise data calculated by the noise data calculator.