X-ray CT Apparatus Object Shift Correction
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Solution Overview
Problem
X-ray CT apparatuses face challenges in accurately reconstructing images due to the relative positional shift between the bed and the object during scanning, leading to artifacts and degraded image accuracy, as they primarily account for the bed's movement rather than the object's position.
Innovation Solution
Incorporating a positional shift detection and processing unit that utilizes distance measuring devices to calculate and compensate for the relative positional shift between the bed and the object, allowing for adjustments in scanning velocity, acceleration, and irradiation timing to improve image quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bed is driven to obtain data of a wide region, then the imaging coverage is improved, but the relative positional relationship between the object and the bed changes causing positional shift
Solution Approach 1:
The system uses distance measuring devices to detect the position of the object on the bed in real-time during scanning, and the control unit adjusts the scanning parameters based on this feedback information to compensate for positional shifts
Solution Approach 2:
The patent replaces mechanical positioning reliance with optical/electronic measurement systems (distance measuring devices) to detect and compensate for object position changes during scanning
2Productivity
If the bed moves continuously for helical shuttle scanning, then the imaging efficiency is improved, but the object position shifts relative to the bed causing artifacts
Solution Approach 1:
During continuous helical shuttle scanning, the distance measuring devices continuously monitor object position, and the control unit uses this feedback to adjust scanning parameters dynamically, maintaining image quality while preserving imaging efficiency
Solution Approach 2:
The system dynamically adjusts scanning parameters based on real-time object position detection, making the scanning process adaptive rather than static, allowing continuous motion while compensating for position changes
3Area of stationary object
If the bed moves for jog shuttle scanning, then the imaging coverage is improved, but the stoppage and movement cycles cause object position shifts
Solution Approach 1:
The system detects object position before scanning begins and can make preliminary adjustments to scanning parameters or object positioning to prevent position shifts during the scanning process
Solution Approach 2:
The control unit monitors object position throughout the stoppage and movement cycles and adjusts scanning parameters based on this feedback to maintain position consistency across multiple scanning cycles
Data Source
AI summary
An X-ray CT apparatus includes an X-ray tube, X-ray detector detecting the X-rays transmitted through an object, data acquisition unit acquiring projection data of the object based on an output from the X-ray detector, bed driving control unit moving a top to place the object along a long-axis direction of the top, image processing unit generating a reconstructed image based on the projection data, positional shift amount detection unit detecting a shift amount of a relative position between the top and the object, and positional shift processing unit performing processing based on a detection result obtained by the positional shift amount detection unit, in accordance with movement of the top by the bed driving control unit.