Radiographic Image Detection Device Offset Correction
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Solution Overview
Problem
Radiographic image detection devices face challenges in achieving accurate offset correction due to temperature-dependent dark current noise and residual images, which can reduce image quality and accuracy, especially when offset data is not acquired immediately before imaging.
Innovation Solution
A radiographic image detection device that acquires multiple correction images in a shorter accumulation time using binning reading before imaging, selects suitable images based on time elapsed since previous imaging or residual image variation, and performs correction using averaging and difference images to improve accuracy and suppress residual image influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset data is acquired immediately before X-ray imaging, then the accuracy of offset correction is improved, but a time lag occurs between the instruction to perform imaging and the actual imaging
Solution Approach 1:
The system performs offset data acquisition in advance during idle periods between imaging operations. The offset data is stored and then applied during subsequent imaging operations, eliminating the need to acquire it immediately before each imaging while maintaining correction accuracy.
Solution Approach 2:
The system dynamically determines whether to use pre-acquired offset data or to acquire new offset data based on temperature changes and imaging conditions. This adaptive approach allows the system to balance between maintaining accurate correction and minimizing time lag.
2Measurement precision
If the number of acquired correction images is increased, then the quality of correction image is improved with less noise, but the correction image may be affected by residual image from previous imaging
Solution Approach 1:
The system monitors temperature changes and imaging timing to determine the optimal number of correction images to acquire. Based on feedback from temperature sensors and imaging schedules, the system dynamically adjusts the number of correction images acquired, ensuring high quality while avoiding residual image contamination.
Solution Approach 2:
The system changes the parameter of the number of correction images acquired based on temperature conditions and imaging timing. When temperature is stable and sufficient time has elapsed since previous imaging, more correction images are acquired for higher quality. When temperature changes rapidly or imaging is urgent, fewer images are acquired to minimize time lag.
3Stability of the object's composition
If offset data is acquired with long time interval from X-ray imaging, then temperature stability is improved, but dark current noise component changes resulting in reduced offset correction accuracy
Solution Approach 1:
The system performs offset data acquisition during idle periods between imaging operations, utilizing the stable temperature conditions that exist when the device is not actively imaging. This preliminary action captures accurate offset data without requiring immediate use, thus maintaining both temperature stability and correction accuracy.
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 enhances the accuracy of offset correction and reduces the impact of residual images, ensuring high-quality radiographic images by selecting appropriate correction images and applying them effectively to the imaging process.
Implementation Method 1
an X-ray image detection device that directly converts X-rays into charge
Implementation Method 2
an indirect conversion type that converts X-rays into visible light and then converts the visible light into charge
Data Source
AI summary
The radiographic image detection device performs: a radiographic image generation process of reading a pixel signal from a pixel region in a state in which radiation is emitted to generate a radiographic image; a first correction image acquisition process of reading the pixel signal from the pixel region a plurality of times to acquire a plurality of first correction images in a shorter accumulation time than the radiographic image or using binning reading in a state in which the radiation is not emitted immediately before radiography including the radiographic image generation process; a selection process of selecting, as an averaging target, at least two or more of the plurality of first correction images according to a time elapsed since immediately preceding radiography or an amount of variation in a residual image based on the first correction image; and a correction process of correcting the radiographic image on the basis of an average image obtained by averaging the first correction images selected as the averaging target.