Radiation Image Capturing Apparatus Noise Subtraction
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Solution Overview
Problem
Existing radiation image capturing apparatuses face challenges in reducing horizontal noise and artifacts in moving image capturing, particularly when subtracting noise data from image data, which can lead to distorted frame images and inaccurate radiation dose calculations.
Innovation Solution
A radiation image capturing apparatus equipped with a noise detection unit that estimates an offset component and calculates noise data based on voltage noise generated in reverse bias and off-voltage, allowing for accurate subtraction from image data to generate corrected image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise data is subtracted from image data to reduce horizontal noise, then noise reduction is improved, but artifacts appear in frame images and radiation dose calculations become inaccurate
Solution Approach 1:
The patent segments the noise data into two distinct components: horizontal noise (striped pattern extending in scan line direction) and offset component (causing image unevenness). By separating these components, the system can selectively remove only the horizontal noise while preserving the offset component, thereby avoiding artifacts in frame images and maintaining accurate radiation dose calculations.
Solution Approach 2:
The patent applies different processing treatments to different components of the noise data. The horizontal noise component is removed through subtraction, while the offset component is preserved and not subtracted from the image data. This localized quality approach ensures that only the harmful horizontal noise is eliminated while maintaining the integrity of the offset information needed for accurate dose calculations.
2Object-affected harmful factors
If noise data is subtracted from image data, then horizontal noise is reduced, but image quality deteriorates due to distorted frame images
Solution Approach 1:
The patent segments the noise data into horizontal noise and offset component, allowing selective removal of only the horizontal noise portion. This segmentation prevents the offset component from being subtracted, thereby avoiding image distortion and maintaining frame image stability and quality.
3Device complexity
If simple noise subtraction is performed, then processing simplicity is maintained, but noise reduction effectiveness is insufficient due to horizontal noise and artifacts
Solution Approach 1:
The patent segments the noise data into distinct components (horizontal noise and offset component) and applies selective subtraction. This approach enhances noise reduction effectiveness by targeting only the horizontal noise, while the systematic processing method maintains reasonable complexity through automated component identification and selective removal.
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 effectively reduces horizontal noise and prevents artifacts in radiation images, ensuring accurate radiation dose calculations and improved image quality in both still and moving image capturing.
Implementation Method 1
The direct-type radiation image capturing apparatus generates electric charges according to the dose(s) of received radiation, such as X-rays, and converts the electric charges into electric signals with detection elements
Implementation Method 2
The indirect-type radiation image capturing apparatus first converts received radiation into electromagnetic waves of another wavelength, such as visible light, with a scintillator
Data Source
AI summary
A radiation image capturing apparatus includes scan lines, signal lines, radiation detection elements, bias lines, a readout IC, a control unit and a noise detection unit. The detection elements generate electric charges by receiving radiation. The readout IC reads respective image data based on the respective electric charges. The control unit controls at least the readout IC. At the time when each image data is read, the detection unit outputs data based on voltage noise in reverse bias voltage applied to the detection elements via the bias lines and/or voltage noise in off voltage applied to the scan lines. The control unit estimates an offset component in the output data, calculates noise data based on the output data and the offset component and subtracts the noise data from the image data, thereby generating corrected image data.