Radiation Sensor Signal Readout for Crosstalk Noise Reduction
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Solution Overview
Problem
Existing radiation image capturing apparatuses face decreased Auto Exposure Control (AEC) accuracy due to crosstalk noise and substrate noise, which affect signal levels from monitor sensors during radiation irradiation.
Innovation Solution
A radiation image capturing apparatus with a switch that alternates between conductive and non-conductive states to read out sensor signals, allowing for the calculation of radiation dose based on these signals and the potential of signal lines, thereby reducing crosstalk noise and improving AEC accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If signals are regularly read out from the monitor sensor during radiation irradiation, then Auto Exposure Control can be performed, but crosstalk noise and substrate noise cause signal level variation and decrease AEC accuracy
Solution Approach 1:
The switch alternates between conductive and non-conductive states at regular intervals during radiation irradiation, enabling periodic reading of sensor signals. This periodic action allows differentiation between signal components by comparing readings taken during conductive states (when sensor signal is present) and non-conductive states (when only noise is present), thereby improving AEC accuracy while maintaining automated control
Solution Approach 2:
The invention converts the harmful crosstalk noise and substrate noise into a useful reference signal. By reading the sensor output during non-conductive states when no sensor signal is present, the noise component is isolated and can be subtracted from the total signal read during conductive states, transforming the previously harmful noise into a benefit for improving measurement precision
2Productivity
If the switch is kept in conductive state for continuous signal reading, then AEC can be performed continuously, but crosstalk noise between control signal line and sensor signal line increases
Solution Approach 1:
Instead of maintaining continuous conduction, the switch operates periodically alternating between conductive and non-conductive states. This periodic operation maintains productivity by continuously sampling signals while reducing crosstalk noise by ensuring the switch is non-conductive during portions of the cycle when control signals are being transmitted, thereby isolating the sensor signal line from control signal interference
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 effectively increases AEC accuracy by canceling crosstalk noise and improving the precision of radiation dose calculation, leading to enhanced image capturing performance.
Implementation Method 1
a sensor (S31 to S33) configured to monitor an irradiating dose of radiation from a radiation source (300)
Data Source
AI summary
A radiation image capturing apparatus, comprising a sensor configured to monitor an irradiating dose of radiation, a switch configured output a sensor signal from the sensor, a readout unit configured to read out the sensor signal via a signal line, and a controlling unit, wherein the controlling unit performs first control of repeatedly performing, while the sensor is irradiated, a series of operations including a first operation of setting the switch to a conductive state and a second operation of setting the switch to a non-conductive state, second control of reading out the sensor signal in the first operation as a first signal and a potential of the signal line in the second operation as a second signal, and third control of calculating the irradiating dose of radiation based on the first signal and the second signal.