Radiation Imaging Offset Correction via Temperature Stabilization
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Solution Overview
Problem
Current radiation imaging systems face challenges in maintaining accurate offset correction due to temperature fluctuations, leading to image quality deterioration and increased power consumption, especially when trying to perform high-speed imaging immediately after starting or completing a radiation imaging session.
Innovation Solution
A radiation imaging system that includes a temperature stabilizing unit to manage temperature changes, an imaging unit for capturing radiation images, an obtaining unit for non-exposure correction images, and a determination unit to switch between offset correction methods based on the effectiveness of the temperature stabilization, ensuring proper offset correction processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If offset correction data is obtained before imaging for a radiation image of an object, then the frame rate is high and high-speed continuous imaging can be performed, but the accuracy of offset correction processing is not satisfactory due to temperature fluctuations and dark current changes
Solution Approach 1:
The system performs preliminary actions by obtaining offset correction data both before imaging (for high frame rate) and after imaging (for accuracy). The control unit selectively uses the appropriate correction data based on timing requirements, allowing high-speed continuous imaging while maintaining correction accuracy through the use of post-imaging correction data when available
Solution Approach 2:
The control unit changes the parameter of correction data selection based on timing conditions. It switches between using pre-imaging offset correction data (when high frame rate is prioritized) and post-imaging offset correction data (when correction accuracy is prioritized), adapting to different operational requirements dynamically
2Reliability
If offset correction processing is performed by alternately obtaining a radiation image of an object and non-exposure image data, then the image lag is reduced, but the frame rate is low
Solution Approach 1:
The system performs preliminary offset correction by obtaining non-exposure image data before imaging, which allows high-speed continuous imaging to proceed without waiting for alternating correction cycles. This preliminary correction reduces image lag effects while maintaining high frame rate capability
Solution Approach 2:
The system maintains continuous imaging action by obtaining offset correction data in advance rather than alternating between imaging and correction. This continuous operation mode preserves high frame rate while the control unit ensures correction accuracy by selectively applying appropriate correction data
3Ease of operation
If the radiation imaging apparatus operates immediately after starting or completing imaging, then high operability is achieved, but stable offset correction processing cannot be executed due to temperature instability
Solution Approach 1:
The control unit implements feedback by monitoring the availability and quality of offset correction data. It determines whether to proceed with imaging based on whether stable correction data is available, and adjusts operation accordingly - allowing immediate operation when correction data is available while ensuring correction stability is maintained
Solution Approach 2:
The system performs preliminary offset correction data acquisition before immediate operation begins. By obtaining correction data in advance even during rapid sequential operations, the system enables high operability while maintaining correction stability through the use of pre-acquired correction data
4Measurement precision
If offset correction data is obtained periodically to maintain accuracy, then the accuracy of offset correction processing is improved, but power consumption increases due to operations other than imaging
Solution Approach 1:
The system performs partial offset correction by obtaining correction data only when necessary - specifically before imaging for high frame rate operations and after imaging when accuracy is prioritized. This selective correction approach maintains adequate accuracy while reducing unnecessary periodic corrections that would increase power consumption
Solution Approach 2:
The control unit changes the frequency and timing of offset correction data acquisition based on operational requirements. It adjusts between obtaining correction data before imaging, after imaging, or selectively based on temperature stability, thereby maintaining accuracy while optimizing power consumption by avoiding excessive periodic corrections
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 allows for improved image quality and reduced power consumption by adapting offset correction methods according to the temperature stabilization effectiveness, enabling high-frame-rate imaging while minimizing image lag and maintaining accurate offset correction.
Implementation Method 1
a scintillator that converts radiation into visible light
Implementation Method 2
a photodetector such as a CCD (Charge-Coupled device) or CMOS (Complementary Metal-Oxide Semiconductor)
Data Source
AI summary
A radiation imaging system stabilizes a change in temperature of a radiation imaging apparatus, obtains a radiation image of an object based on radiation applied from a radiation source and reaching through the object, obtains a correction image by performing imaging without irradiation with the radiation from the radiation source, performs, using the correction image, image processing for correcting an offset component appearing in the radiation image on the radiation image, and determines whether stabilization of a change in temperature of the radiation imaging apparatus is effectively functioning. The radiation imaging system switches modes of obtaining the correction image based on determination.