Radiation Imaging FPN Correction Using Temperature Compensation
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Solution Overview
Problem
Existing radiation imaging systems face challenges in accurately removing fixed pattern noise (FPN) from radiation images due to temperature variations between the time of generating the FPN image and the radiation image, leading to streaked artifacts and reduced frame rates.
Innovation Solution
A radiation imaging system that generates a first pixel value and first offset value before radiation imaging, and a second pixel value and second offset value during imaging, using these values to correct the radiation image, thereby accounting for temperature-induced variations and improving FPN correction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an FPN image is generated for every frame of fluoroscopy to achieve high FPN correction accuracy, then the FPN removal accuracy is improved, but the frame rate cannot be increased due to the time-consuming generation process
Solution Approach 1:
The patent applies preliminary action by generating the FPN image once before fluoroscopy starts, rather than generating it for every frame. This pre-generated FPN image is then reused for correcting multiple frames during fluoroscopy, which maintains FPN correction capability while significantly increasing the frame rate.
2Productivity
If an FPN image is generated before the start of fluoroscopy to increase frame rate, then the productivity is improved, but FPN cannot be satisfactorily removed and streaked artifacts appear due to temperature differences
Solution Approach 1:
The patent applies dynamics by introducing a temperature management mechanism. The system monitors temperature changes between FPN image generation and fluoroscopy, and dynamically adjusts the correction process by calculating temperature differences and applying appropriate compensation to the FPN correction values, thereby maintaining accuracy despite temperature variations.
Solution Approach 2:
The patent applies parameter changes by using temperature as a correction parameter. The system measures the temperature difference between FPN image acquisition and fluoroscopy execution, and uses this temperature parameter to adjust the FPN correction calculation, compensating for thermal drift effects on pixel characteristics.
3Productivity
If the temperature in the radiation imaging apparatus differs between FPN image generation and radiation image generation, then the frame rate can be maintained, but FPN in the radiation image differs from FPN in the FPN image leading to correction errors
Solution Approach 1:
The patent applies feedback by implementing a temperature monitoring and compensation loop. The system continuously monitors temperature changes, feeds this information back to the correction algorithm, and adjusts the FPN correction values accordingly. This feedback mechanism ensures that correction accuracy is maintained despite temperature variations during fluoroscopy.
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 enables high-accuracy FPN correction, reducing streaked artifacts and allowing for increased frame rates by using pre-generated FPN images in conjunction with real-time offset data, effectively isolating the radiation dose component in the corrected image.
Implementation Method 1
a plurality of pixels configured to generate a signal corresponding to a radiation dose
Data Source
AI summary
A radiation imaging system for performing a plurality of times of radiation imaging is provided. A readout circuit generates a value corresponding to a signal read out from each pixel. A control unit causes the readout circuit to generate a first pixel value corresponding to a signal read out from each pixel, and a first offset value of the readout circuit before starting the plurality of times of radiation imaging. The control unit causes the readout circuit to generate a second pixel value corresponding to a signal read out from each pixel, and a second offset value of the readout circuit during a plurality of times of radiation imaging. A correction unit corrects the second pixel value by using the first pixel value, the first offset value, and the second offset value.