Radiographic Sensor Gate Readout Pattern Selection
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Solution Overview
Problem
Conventional radiographic imaging devices often produce abnormal image quality due to fluctuations in bias voltage, especially under high radiation doses, leading to offset components and offset images.
Innovation Solution
A radiographic imaging system with a processor that sets imaging conditions affecting radiation dose, selects a gate readout pattern based on these conditions, and drives the gate driver and reader using the selected pattern to stabilize bias voltage and prevent image quality abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the readout time is extended to ensure accurate signal reading, then the image quality is improved, but the imaging speed and productivity deteriorate
Solution Approach 1:
The patent applies dynamic adjustment of the gate signal width based on the radiation dose. When the radiation dose is high, the gate signal width is extended to ensure complete charge transfer and accurate reading. When the radiation dose is low, the gate signal width is reduced to enable faster frame rates. This dynamic adaptation resolves the contradiction between image quality and imaging speed by optimizing the readout time according to actual imaging conditions.
Solution Approach 2:
The patent changes the parameter of gate signal width dynamically based on radiation dose levels. By adjusting this temporal parameter, the system can adapt the readout duration to match the charge accumulation level, ensuring sufficient readout time for high-dose images while maintaining high frame rates for low-dose images, thus resolving the quality-speed tradeoff.
2Measurement precision
If the gate signal width is extended to ensure complete charge transfer, then the readout accuracy is improved, but the frame rate and productivity deteriorate
Solution Approach 1:
The system dynamically adjusts the gate signal width based on the radiation dose level. For high-dose imaging where complete charge transfer is critical, the gate signal width is extended to ensure accurate reading. For low-dose imaging where frame rate is more important, the gate signal width is reduced. This dynamic adjustment resolves the contradiction between readout accuracy and frame rate.
Solution Approach 2:
The patent modifies the temporal parameter of gate signal width according to radiation dose conditions. This parameter change enables the system to optimize between complete charge transfer (requiring longer gate width) and high frame rates (requiring shorter gate width), resolving the accuracy-productivity contradiction.
3Productivity
If the imaging time is reduced to increase frame rate, then the productivity is improved, but the bias voltage stability and image quality deteriorate
Solution Approach 1:
The patent implements dynamic control of the gate signal timing relative to the radiation pulse. By carefully timing the gate signal to start after the radiation pulse and extending it sufficiently, the system ensures that charge transfer completes during periods when bias voltage fluctuations have settled. This dynamic timing adjustment allows high frame rates while maintaining bias voltage stability and image quality.
Solution Approach 2:
The system performs preliminary timing adjustment of the gate signal to account for bias voltage convergence time. The gate signal is scheduled to activate after the radiation pulse and during the period when bias voltage has stabilized, ensuring that charge transfer occurs under stable voltage conditions even at high frame rates.
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 system generates radiographic images without quality abnormalities even under high radiation conditions by securing sufficient time for bias voltage convergence, ensuring equal offset components in exposure images.
Implementation Method 1
a sensor that includes multiple semiconductor elements arranged two-dimensionally... amount of charge released by the each of the semiconductor elements
Data Source
AI summary
Provided is a radiographic imaging device including: a first hardware processor; a sensor that includes multiple semiconductor elements arranged two-dimensionally and multiple switch elements respectively connected to the semiconductor elements; a gate driver that causes each of the switch elements of the sensor to switch between a conductive state and non-conductive state so as to release charge from each of the semiconductor elements; and a reader that performs readout of a signal value according to an amount of the charge released by the each of the semiconductor elements of the sensor. The first hardware processor sets an imaging condition that affects a dose of radiation reaching the sensor, selects a gate readout pattern according to the set imaging condition among different gate readout patterns, and drives the gate driver and the reader using the selected gate readout pattern.