Dual X-ray Source Rings for High-Speed CT Imaging
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Solution Overview
Problem
Current X-ray computed tomography technologies face limitations in increasing rotational speed due to centrifugal forces and are not suitable for three-dimensional scanning, with existing systems being large and unsuitable for volume scanning due to offset positions of X-ray detectors and electron beams.
Innovation Solution
The implementation of two X-ray source rings with a single detector ring, where X-ray sources are arrayed along a central axis, and wedge filters and post-collimators are used to unify X-ray doses and limit solid angles, allowing for high-speed imaging and three-dimensional scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotational speed of the rotating ring is increased, then the imaging speed is improved, but the centrifugal force increases making it difficult to greatly increase the current rotational speed
Solution Approach 1:
The patent divides the single rotating ring into two separate rotating rings, each carrying only X-ray sources or detectors. This segmentation reduces the weight and moment of inertia of each rotating component, enabling higher rotational speeds without generating excessive centrifugal forces.
Solution Approach 2:
The patent replaces the mechanical rotation of heavy components with a stationary gantry structure where only lightweight collimators rotate. The X-ray sources and detectors remain fixed, eliminating the need for high-speed rotation of heavy masses while maintaining imaging capability.
2Power
If an electron gun is used to emit electron beam in fifth-generation CT, then X-ray generation is achieved, but the overall size of the system becomes large
Solution Approach 1:
The patent extracts and removes the electron gun and coil components from the system. Instead, it uses conventional X-ray tubes with cathodes and anodes that generate X-rays through electrical heating and electron acceleration, eliminating the need for electromagnetic deflection systems and reducing overall system size.
Solution Approach 2:
The patent uses a stationary array of X-ray tubes that replicate the X-ray generation function without requiring the complex electron beam deflection mechanism. Multiple fixed X-ray sources replace the single movable electron beam system, achieving the same imaging capability with a more compact design.
3Measurement precision
If X-ray detectors and electron beam are offset from each other in terms of positional relationship, then X-ray detection is achieved, but the scheme is not suitable for three-dimensional scanning
Solution Approach 1:
The patent transitions from a two-dimensional detection geometry to a three-dimensional volume scanning capability by arranging multiple X-ray sources and detectors in concentric rings. This configuration enables simultaneous acquisition of data from multiple angles and positions, providing true three-dimensional imaging capability.
Solution Approach 2:
The patent creates a multi-functional system where the stationary ring array can perform both conventional two-dimensional CT scanning and three-dimensional volume scanning. The same hardware configuration supports multiple imaging modes, including spectral CT and high-speed cardiac imaging, without requiring additional specialized components.
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 enables faster imaging times, reduces exposure dose, and improves spatial resolution by allowing for high-speed rotation of lighter components, making it suitable for cardiac imaging and other applications with minimal scattered radiation.
Implementation Method 1
Each of the plurality of X-ray sources 11 includes a cathode 111 and an anode 115. The gate electrode 113 generates an electric field between itself and the cathode 111 upon reception of a gate pulse. The electrons emitted from the cathode 111 fly to the anode 115 upon reception of tube voltages
Implementation Method 2
a first wedge filter 21 and a second wedge filter 21 are respectively arranged in front of the plurality of X-ray sources 11
Implementation Method 3
a first post-collimator 27 and a second post-collimator 27 are respectively arranged in front of the plurality of X-ray detectors 15
Data Source
AI summary
A gantry includes two X-ray source rings and a detector ring. Each X-ray source ring includes a plurality of X-ray sources arrayed circumferentially. The detector ring is provided next to the X-ray source ring and includes a plurality of X-ray detectors arrayed circumferentially. Each of the plurality of X-ray detectors detects X-rays from the X-ray source ring. A data collection circuit collects raw data corresponding to the intensity of the detected X-rays. A reconstruction unit reconstructs the collected raw data into a CT image based on digital data.