Multi-Source CT Scanning for Wider Imaging Field of View
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Solution Overview
Problem
Existing CT scanning systems face limitations in expanding the imaging field of view without increasing the size of the detector and system, particularly when using high-energy rays, leading to poor image quality or inconvenient system design and maintenance.
Innovation Solution
A CT scanning system with multiple ray sources arranged in a scanning plane, each with different divergence angles, rotates around the object to emit beams sequentially, allowing for a larger imaging field of view without enlarging the detector or system size, and includes a control apparatus for synchronized rotation and data processing to integrate and reconstruct images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the divergence angle of the ray source is enlarged to expand the imaging field of view, then the imaging field of view is expanded, but the image quality decreases due to dose angle distribution
Solution Approach 1:
The patent divides the single ray source into multiple ray sources (first ray source and second ray source) with different divergence angles. Each ray source emits rays at a specific divergence angle, allowing the system to cover a larger imaging field of view while maintaining adequate dose distribution in different regions. The controller coordinates the sequential emission of rays from multiple sources to achieve complete coverage without sacrificing image quality.
2Area of stationary object
If the distance between ray source and detector is increased to expand the imaging field of view, then the imaging field of view is expanded, but the overall system size increases
Solution Approach 1:
Instead of increasing the distance between a single ray source and detector, the patent segments the ray emission function into multiple ray sources positioned at different locations. This allows the system to achieve a larger imaging field of view by expanding the angular coverage from multiple sources rather than increasing the radial distance, thereby keeping the overall system size compact.
Solution Approach 2:
The patent transitions from a single-ray-source configuration to a multi-ray-source configuration arranged in specific spatial patterns. By utilizing spatial arrangement in addition to angular divergence, the system achieves extended imaging field of view without proportionally increasing system dimensions, effectively using multiple degrees of freedom (position and angle) to solve the field of view limitation.
3Area of stationary object
If the size of the detector is increased to expand the imaging field of view, then the imaging field of view is expanded, but the system complexity and size increase
Solution Approach 1:
The patent segments the detection function by coordinating multiple ray sources with a single or limited number of detectors. Instead of requiring a large detector to capture all rays, the system uses multiple ray sources emitting at different angles, allowing a smaller detector to receive rays from each source sequentially or simultaneously. This reduces detector size while maintaining comprehensive imaging coverage.
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
The system effectively expands the imaging field of view, maintains image quality, and reduces system size, facilitating efficient scanning of larger objects with high-energy rays.
Implementation Method 1
the at least one ray source group is configured to rotate around the scanned object during scanning to scan the scanned object at a plurality of rotation angles
Implementation Method 2
The rays emitted by each ray source irradiate the object to be detected, pass through the object and are received by the corresponding detector
Implementation Method 3
the detector is configured to receive the rays emitted from the corresponding ray source group and transmitted through the scanned object
Data Source
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Figure 3(a)~4(b)
Figure 5(a)~5(b)
AI summary
The present invention relates to a CT scanning system and method. The scanning system comprises: at least one ray source group, used for emitting rays to an object to be scanned, each ray source group comprising a plurality of ray sources, and the plurality of ray sources being spaced apart in the same scanning plane and having different ray spread angle directions; and at least one detector, arranged in one-to-one correspondence with the at least one ray source group, each detector receiving rays which are emitted from the corresponding ray source group and transmit through the object to be scanned. During a scanning process, the at least one ray source group rotates around the object to be scanned, so as to scan said object at a plurality of rotational angles, and at the same rotational angle, the plurality of ray sources in each ray source group emit ray beams one by one.