X-ray CT Apparatus Dual Source Spatial Resolution
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Solution Overview
Problem
Existing X-ray CT technologies fail to improve spatial resolution in the row direction and channel direction, particularly in two-tube systems.
Innovation Solution
The X-ray CT apparatus employs two X-ray sources and detectors with shifted rotational trajectories and processing circuitry to acquire and generate image data, allowing for improved spatial resolution by dividing detection elements in the row direction and channel direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fan-shaped X-ray beam is used with a single detector array, then the device complexity is low, but the spatial resolution in the row direction cannot be improved
Solution Approach 1:
The detector array is divided into multiple independent detection element groups, where each group can be independently controlled to detect X-rays from different angular positions. This segmentation allows the system to achieve high spatial resolution in the row direction by combining data from multiple segmented detection groups, effectively resolving the contradiction between maintaining low device complexity and improving measurement precision.
2Measurement precision
If detection elements are arranged only in the channel direction, then the device complexity is low, but the spatial resolution in the channel direction cannot be improved beyond the detector's inherent capability
Solution Approach 1:
The invention introduces angular positioning as a new dimension for data acquisition. By arranging detection elements to detect X-rays from multiple angular positions around the subject, the system effectively adds an angular dimension to the traditional channel-direction arrangement. This dimensional expansion enables improved spatial resolution in the channel direction through computational reconstruction, without requiring more complex physical detector arrangements.
3Measurement precision
If multiple X-ray sources and detectors with shifted rotational trajectories are used, then the spatial resolution in row direction is improved, but the device complexity increases
Solution Approach 1:
The invention merges data from multiple detection element groups that are positioned at different angular locations into a unified reconstruction process. By combining the detection results from these groups and applying appropriate weighting based on their angular positions, the system achieves high spatial resolution in the row direction while managing system complexity through integrated data processing rather than physically separate systems.
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 configuration enhances spatial resolution in both the row and channel directions, achieving twice the resolution in the row direction and maintaining it in the channel direction, even in two-tube systems.
Implementation Method 1
a first X-ray source and a first X-ray detector which detects the first X-ray
Implementation Method 2
a second X-ray source and a second X-ray detector which detects the second X-ray
Data Source
AI summary
An X-ray CT apparatus includes a first X-ray source, a first detector, a second X-ray source, a second detector, and processing circuitry. The processing circuitry controls the first X-ray source, the second X-ray source, the first detector, and the second detector to perform scanning. The processing circuitry acquires first data of a plurality of first detection regions and second data of a plurality of second detection regions, each of the plurality of first detection regions and the plurality of second detection regions including one detection element or a plurality of detection elements in a row direction, and the plurality of first detection regions being offset by an amount corresponding to n (0<n<1) of a length of each of the plurality of first detection regions in the row direction from the respective plurality of second detection regions. The processing circuitry generates image data based on the acquired first data and the acquired second data.