X-ray Detection Timing Adjustment for Dead Zone Compensation
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Solution Overview
Problem
The detection accuracy of foreign substances in subjects is compromised due to unclear edges in subtraction images generated by dual-line sensors, primarily caused by the dead zone region between the sensors, leading to inaccuracies in identifying foreign substances, especially at high conveying speeds.
Innovation Solution
The detection timing of the second detector is adjusted based on the width of the dead zone region to ensure that radiation image data from both detectors corresponds, reducing unclear edges in subtraction images and improving detection accuracy by controlling the detection timing using a timing control section and timing calculating section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two line sensors are arranged in parallel to detect X-rays of different energy ranges, then detection accuracy of foreign substances is improved, but unclear edges appear in subtraction images due to the dead zone region between sensors
Solution Approach 1:
The patent applies preliminary action by calculating the dead zone width between the two line sensors in advance, and using this calculated value to pre-determine the timing adjustment amount. This allows the system to compensate for the dead zone effect before image subtraction, thereby eliminating unclear edges in the final subtraction image while maintaining high detection accuracy
2Measurement precision
If the dead zone region between two line sensors is reduced, then detection accuracy is improved, but the dead zone cannot be completely eliminated when different pixels are provided on an identical chip
Solution Approach 1:
The patent applies parameter changes by transforming the spatial parameter (dead zone width) into a temporal parameter (timing adjustment amount). By calculating the timing adjustment based on the dead zone width and the movement speed of the subject, the system compensates for the dead zone effect through timing synchronization rather than physical sensor reconfiguration, thus maintaining detection accuracy without increasing device complexity
3Manufacturing precision
If timing adjustment is performed based on dead zone width, then unclear edges in subtraction images are reduced, but detection timing must be precisely controlled
Solution Approach 1:
The patent applies feedback by using the detected movement speed of the subject as input to dynamically calculate the appropriate timing adjustment amount. The timing control section receives feedback about subject motion and automatically adjusts the detection timing of the second line sensor accordingly, making the system adaptive to different conveying speeds while maintaining image quality
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 detection accuracy of foreign substances by minimizing unclear edges in subtraction images, even at high conveying speeds, thereby improving the overall detection precision.
Implementation Method 1
a first detector (32) that detects transmitted X-rays in a low-energy range to generate first image data, and a second detector (42) that detects transmitted X-rays in a high-energy range to generate second image data
Data Source
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AI summary
A radiation image acquiring system that improves the detection accuracy of a foreign substance etc., in a subject is provided. An X-ray image acquiring system 1 irradiates X-rays to a subject S from an X-ray source, and detects X-rays in a plurality of energy ranges transmitted through the subject S. The X-ray image acquiring system 1 includes a low-energy detector 32 for detecting X-rays in a low-energy range that is transmitted through the subject S to generate low-energy image data, a high-energy detector 42 arranged in parallel to the low-energy detector 32 with a dead zone region 82 sandwiched therebetween, for detecting X-rays in a high-energy range that is transmitted through the subject S to generate high-energy image data, and a timing control section 50 for controlling detection timing of the high-energy detector 42 based on a dead zone width NW of the dead zone region 82 so that low-energy image data to be generated by the low-energy detector 32 and high-energy image data to be generated by the high-energy detector 42 mutually correspond.