Multi-Pixel X-Ray Source for CT Scanning
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Solution Overview
Problem
Current CT scanning systems face challenges in achieving improved image quality and cost-effectiveness, particularly with the impracticality of new scanning geometries like the saddle curve geometry, which are mechanically difficult to implement, especially with rotating gantries and high-speed scanning, and the high maintenance costs of conventional rotating systems.
Innovation Solution
The implementation of a CT scanning system utilizing a multi-pixel x-ray source with a plurality of pixels along the z-axis, each controllably emitting x-rays, combined with a reduced detector array and an image reconstruction system, allowing for improved scanning geometries such as a saddle curve trajectory without tilting the gantry or table, and enabling stationary CT systems with minimal x-ray beam coverage to satisfy reconstruction requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a saddle curve scanning geometry is implemented by tilting gantry or table, then improved image quality is achieved, but mechanical complexity and difficulty increase significantly
Solution Approach 1:
The x-ray source is divided into multiple pixels arranged along the z-axis, with each pixel independently controllable. This segmentation allows the system to achieve saddle curve scanning geometry through selective activation of pixels rather than mechanical tilting, thereby improving image quality while avoiding the mechanical complexity of tilting gantries or tables
Solution Approach 2:
The patent replaces the mechanical tilting system (gantry or table tilt) with an electronic control system that selectively activates pixels along the z-axis. This substitution eliminates the need for complex mechanical tilting mechanisms while achieving the same saddle curve scanning geometry, resolving the contradiction between image quality improvement and mechanical complexity
2Productivity
If conventional rotating gantry systems are used, then scanning functionality is achieved, but maintenance cost increases
Solution Approach 1:
The system transitions from a mechanically rotating gantry to a stationary configuration where pixels are sequentially activated along the z-axis. This dynamic approach maintains scanning functionality through electronic control while eliminating the mechanical wear and maintenance issues associated with rotating gantries
Solution Approach 2:
The rotating mechanical gantry system is replaced with a stationary x-ray source configuration that uses electronic pixel activation to achieve scanning. This substitution eliminates mechanical rotation components, thereby reducing maintenance costs while preserving scanning functionality
3Device complexity
If multi-pixel x-ray sources are used, then device complexity increases, but detector array size can be reduced
Solution Approach 1:
The x-ray source is segmented into multiple pixels along the z-axis, distributing the scanning function across multiple source elements. This segmentation enables the use of a reduced detector array, as each pixel can be activated sequentially to provide the necessary projection data, balancing source complexity with detector reduction
Solution Approach 2:
The patent extends the x-ray source configuration along the z-axis with multiple pixels, adding a dimensional aspect to the source. This dimensional change allows the system to achieve complete data coverage with fewer detector rows, as the multiple pixels provide complementary projection information that reduces the need for extensive detector 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
This configuration enhances image quality, reduces the number of detector rows, and lowers manufacturing and maintenance costs, enabling efficient image reconstruction with reduced mechanical complexity and space requirements, suitable for applications like cardiac and liver imaging and baggage screening.
Implementation Method 1
each pixel configured to controllably emit x-rays in response to incident electrons, when activated
Implementation Method 2
each pixel configured to controllably emit x-rays in response to incident electrons
Implementation Method 3
one or more rows of x-ray detectors that are configured to detect x-rays that are emitted from the pixels and that have traversed the object
Data Source
AI summary
A CT scanning system may include a multi-pixel x-ray source, and a detector array. The multi-pixel x-ray source may have a plurality of pixels that are disposed along a z-axis, and that are sequentially activated so as to controllably emit x-rays in response to incident electrons. The detector array may have one or more rows of x-ray detectors that detect the x-rays that are emitted from the pixels and have traversed an object, and generate data for CT image reconstruction system. In third generation CT scanning systems, the number of detector rows may be reduced. Multi-pixel x-ray source implementation of saddle curve geometry may render a single rotation single organ scan feasible. Using a multi-pixel x-ray source in stationary CT scanning systems may allow x-ray beam design with a minimal coverage to satisfy mathematical requirements for reconstruction.