Dynamic Sampling Interval Adjustment for CT Spatial Resolution
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Solution Overview
Problem
Conventional scanning devices face challenges in achieving optimal spatial resolution and scanning dose during CT scanning due to isochronous and equidistant sampling, which fails to meet specific requirements at varying scanning angles, resulting in poor comprehensive performance of indicators such as spatial resolution and scanning dose.
Innovation Solution
The scanning device adjusts the initial sampling interval at each scanning angle based on ray attenuation variation, determining a corrected sampling interval to optimize spatial resolution and scanning dose, allowing for real-time or pre-determined adjustments to maintain signal noise levels and meet specific spatial resolution requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If isochronous and equidistant sampling is used, then the scanning process is simple and fast, but the spatial resolution and signal quality deteriorate when ray attenuation varies significantly
Solution Approach 1:
The patent applies dynamic sampling by adjusting the sampling interval based on ray attenuation characteristics at different scanning angles. The sampling interval is shortened when attenuation variation is large (requiring higher resolution) and lengthened when attenuation variation is small, transforming the static equidistant sampling into a dynamic adaptive process that optimizes both speed and precision
Solution Approach 2:
The patent changes the sampling parameter (sampling interval) according to the attenuation parameter. By calculating ray attenuation at different angles and using this information to modulate the sampling interval, the system adapts the sampling density to match the actual information content requirements, improving spatial resolution where needed while maintaining scanning efficiency
2Measurement precision
If the sampling interval is reduced to improve spatial resolution, then the scanning time increases and scanning dose increases
Solution Approach 1:
The patent applies local quality by differentiating sampling density across different scanning angles based on local attenuation characteristics. Instead of uniformly reducing the sampling interval throughout the entire scan, the system selectively shortens the interval only at angles where attenuation variation requires higher resolution, while maintaining larger intervals elsewhere, thus improving spatial resolution locally without proportionally increasing overall scanning time
3Measurement precision
If the sampling interval is reduced to improve spatial resolution, then the scanning dose increases
Solution Approach 1:
The patent reduces scanning dose by applying local quality principles to dose distribution. The scanning dose is concentrated at scanning angles where attenuation variation requires higher spatial resolution, while dose is reduced at angles where lower resolution is acceptable. This selective dosing strategy achieves the required spatial resolution in critical areas while minimizing overall patient exposure
Solution Approach 2:
The patent applies partial action by providing high-resolution sampling and higher dose only where attenuation characteristics require it, rather than uniformly across all angles. This partial focus on critical sampling regions achieves adequate spatial resolution for diagnostic purposes while avoiding excessive dose in regions where high precision is not necessary
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 the scanning device to achieve optimized spatial resolution and scanning dose by dynamically adjusting the sampling interval and dose according to ray attenuation variations, thereby improving the overall performance of the scanning process.
Implementation Method 1
rays emitted from the tube may penetrate through the subject, and the detector may receive rays emitted from the tube and through the subject
Implementation Method 2
the scanning system may be rotated around a center of rotation, rays emitted from the tube may penetrate through the subject
Data Source
AI summary
The present disclosure provides a sampling method and sampling apparatus of a scanning device. In at least one example, the sampling method comprises acquiring a ray attenuation variation at each of a plurality of scanning angles of the scanning device, determining a corrected sampling interval at each of the scanning angles of the scanning device by adjusting an initial sampling interval at each of the scanning angles of the scanning device according to the ray attenuation variation at each of scanning angles, and performing actual sampling according to the corrected sampling interval at each of the scanning angles of the scanning device.