Stationary Grating Micro-CT Architecture for Bone Metastasis Detection
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Solution Overview
Problem
Current micro-CT systems suffer from insufficient biological contrast and inefficient data acquisition due to mechanical rotation and instability, which limits their effectiveness in detecting bone metastases and other bone-related issues.
Innovation Solution
A stationary in-vivo grating-enabled micro-CT architecture (SIGMA) with three parallel imaging chains, each comprising an x-ray source array, phase grating, and analyzer grating, replaces mechanical rotation with electronic multiplexing, allowing for micron-level alignment and faster data acquisition through few-view image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mechanical rotation is used in conventional micro-CT systems, then imaging coverage is achieved, but imaging speed is slow and system stability is poor
Solution Approach 1:
The patent replaces the mechanical rotation system with a stationary imaging architecture using multiple fixed imaging chains. Each chain includes an x-ray source, phase grating, analyzer grating, and detector array positioned at different angles. The system achieves full angular coverage by combining data from multiple stationary chains rather than rotating a single chain, eliminating mechanical complexity while maintaining imaging capability.
Solution Approach 2:
The imaging system is divided into multiple independent imaging chains (at least three), each oriented at different angles relative to the sample. This segmentation allows parallel data acquisition from multiple angles simultaneously, replacing the sequential angular sampling of mechanical rotation and thereby increasing imaging speed while maintaining system stability.
2Measurement precision
If conventional micro-CT imaging is used, then structural information is obtained, but biological contrast is insufficient
Solution Approach 1:
The patent introduces phase gratings as intermediary elements between the x-ray source and sample, and between the sample and detector. These gratings modulate the x-ray wavefront to encode phase shift information caused by the sample. By using grating-based interferometry, the system converts subtle phase shifts (which conventional detectors cannot measure) into detectable intensity variations, thereby revealing biological contrast information that would otherwise be lost.
Solution Approach 2:
The system measures multiple x-ray interaction parameters simultaneously: attenuation coefficient, phase shift, and small-angle scattering. By analyzing how x-rays interact with tissue through different physical mechanisms rather than relying solely on attenuation, the system generates multi-contrast images that reveal subtle biological differences in soft tissues, bone marrow, and cortical bone that are invisible to conventional micro-CT.
3Reliability
If stationary imaging chains are used, then system stability is improved, but angular coverage must be achieved through multiple chains
Solution Approach 1:
Each imaging chain is designed as a universal module capable of capturing complete projection data for its specific angle. The chains are identical in structure (source, phase grating, analyzer grating, detector) but oriented differently. This modular universality allows the system to achieve full 360-degree angular coverage by combining data from multiple chains, where each chain performs the same function at a different orientation, reducing the total number of components needed compared to a fully redundant multi-view system.
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 SIGMA system achieves tri-contrast imaging with 30 μm resolution and a 30-minute scan time, significantly improving imaging speed and quality while maintaining x-ray dose levels comparable to conventional micro-CT scans, enabling better detection and analysis of bone metastasis and other bone-related conditions.
Implementation Method 1
Each imaging chain includes an x-ray source array, a phase grating, an analyzer grating and a detector array
Implementation Method 2
Each imaging chain includes an x-ray source array... A plurality of selected x-ray source elements of a first x-ray source array is configured to emit a plurality of x-ray beams
Implementation Method 3
each imaging chain is configured to provide tri-contrasts comprising attenuation, phase shift and small angle scattering
Implementation Method 4
each imaging chain is configured to provide tri-contrasts comprising attenuation, phase shift and small angle scattering
Implementation Method 5
each imaging chain is configured to provide tri-contrasts comprising attenuation, phase shift and small angle scattering
Data Source
AI summary
A stationary in-vivo grating-enabled micro-CT (computed tomography) architecture (SIGMA) system includes CT scanner control circuitry and a number of imaging chains. Each imaging chain includes an x-ray source array, a phase grating, an analyzer grating and a detector array. Each imaging chain is stationary and each x-ray source array includes a plurality of x-ray source elements. Each imaging chain has a centerline, the centerlines of the number of imaging chains intersect at a center point and a first angle between the centerlines of a first adjacent pair of imaging chains equals a second angle between the centerlines of a second adjacent pair of imaging chains. A plurality of selected x-ray source elements of a first x-ray source array is configured to emit a plurality of x-ray beams in a multiplexing fashion.