Imaging Apparatus Pixel Grouping for Line Noise Reduction
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Solution Overview
Problem
Conventional radiation imaging systems for medical fluoroscopic radiographing suffer from line noise artifacts, which degrade image quality and diagnosis capability, especially due to structural errors in matrix drive and read-out circuit configurations, and existing solutions are inadequate in reducing low-intensity, low-frequency line noise without significant pixel loss or complex operations.
Innovation Solution
The system divides pixels into groups with independent power sources for each group, allowing for the suppression of line noise artifacts by providing unrelated reference potentials to operational amplifiers in the read-out circuit, reducing line noise without complex operations or significant pixel reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common power source is used for all pixels in the sensor array, then the device complexity is reduced, but line noise artifacts occur due to collective switching operations affecting multiple pixels simultaneously
Solution Approach 1:
The sensor array is divided into multiple groups, with each group having its own independent power source. This segmentation prevents collective switching operations from affecting all pixels simultaneously, thereby reducing line noise artifacts while maintaining manageable device complexity through modular power source organization
2Object-generated harmful factors
If pixels are divided into multiple groups with independent power sources, then line noise is reduced, but the device complexity increases due to multiple power sources and wiring
Solution Approach 1:
The sensor array is divided into multiple groups, with each group having its own independent power source. This segmentation prevents collective switching operations from affecting all pixels simultaneously, thereby reducing line noise artifacts while maintaining manageable device complexity through modular power source organization
3Device complexity
If a common reference potential is supplied to all operational amplifiers, then the circuit design is simplified, but line noise artifacts occur due to power fluctuations affecting all channels simultaneously
Solution Approach 1:
The read-out circuit is divided into multiple channels, with each channel having its own independent reference potential. This segmentation ensures that power fluctuations or switching operations in one channel do not affect other channels, thereby reducing line noise artifacts while maintaining organized circuit design through modular reference potential distribution
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 configuration effectively suppresses line noise artifacts, improving image quality and diagnosis capability in medical fluoroscopic radiographing systems by reducing line noise to 1/v2 or ½, depending on the number of power source divisions, while maintaining display immediacy and radiographic area.
Implementation Method 1
a conversion element for converting radiation into charge
Data Source
AI summary
An imaging apparatus capable of reducing a line noise artifact in a simple configuration without complicated operations includes: a plurality of pixels arranged in row and column directions and having a photoelectric conversion element and a switch element; a plurality of signal wirings connected to the plurality of switch elements in the column direction; a read-out circuit connected to the plurality of signal wirings; and a power source for supplying a voltage to the photoelectric conversion element. With the configuration, the plurality of pixels are classified into a plurality of groups, and the power sources are independently provided for each of the plurality of groups.