Motion Artifact Reduction via Synchronized 3D Surface Tracking
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Solution Overview
Problem
Patient motion during X-ray imaging leads to inconsistent projections, resulting in significant image artifacts, which limits the accuracy and utility of volume imaging systems, particularly in low-cost CT applications and developing countries.
Innovation Solution
A system and method that combines a surface acquisition system for generating 3D surface models with an X-ray imaging system, using a controller to synchronize and process the data to reconstruct a 3D volume with reduced motion artifacts, employing techniques like structured light imaging and motion gating for real-time correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If patient motion compensation techniques are implemented, then image quality and measurement accuracy are improved, but device complexity and cost increase
Solution Approach 1:
The system segments the motion compensation task into two independent modules: (1) a surface acquisition system using structured light projection and imaging for 3D surface tracking, and (2) an X-ray imaging system for projection data acquisition. This segmentation allows each module to be optimized independently and facilitates synchronization through timestamp-based association of surface models with projection data.
Solution Approach 2:
The patent introduces 3D surface models as an intermediary between the physical patient motion and the X-ray image reconstruction process. These surface models serve as a mediator that captures motion information independently and provides correction data to the reconstruction algorithm, decoupling the motion tracking from the X-ray acquisition mechanics.
2Reliability
If motion compensation systems are added to reduce artifacts, then image reliability is improved, but system cost and complexity increase
Solution Approach 1:
The surface acquisition system performs multiple functions: (1) captures real-time 3D surface motion of the patient, (2) provides motion information for artifact reduction, and (3) can potentially serve as a standalone motion tracking system for other imaging applications. This multi-functionality justifies the added complexity by providing multiple benefits from a single system addition.
Solution Approach 2:
The system establishes a feedback loop where surface motion is continuously monitored, synchronized with X-ray projections, and fed back into the reconstruction process. The controller associates surface models with projection data using timestamps and provides motion information that corrects for patient movement, creating a closed-loop system that actively compensates for motion artifacts.
3Object-affected harmful factors
If synchronized surface acquisition and X-ray imaging are used, then motion artifact reduction is achieved, but data processing complexity increases
Solution Approach 1:
The system performs preliminary action by acquiring and generating 3D surface models continuously during the X-ray projection acquisition process. Rather than attempting to correct motion after reconstruction, the motion information is captured in real-time and prepared in advance, allowing the reconstruction algorithm to directly incorporate motion compensation without complex post-processing.
Solution Approach 2:
The patent replaces complex mechanical motion tracking systems with an optical-based surface acquisition system using structured light. This substitution uses light projection and imaging to capture surface geometry changes, replacing what would otherwise require complex mechanical sensors or markers attached to the patient, thereby simplifying the overall system integration.
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
Effectively reduces motion-related artifacts in X-ray images, improving the accuracy and reliability of 3D volume imaging by compensating for patient movement, thereby enhancing the utility of low-cost CT systems and broader acceptance of volume imaging technologies.
Implementation Method 1
A system and method for motion artifacts reduction employs techniques like structured light imaging and motion gating for real-time correction
Implementation Method 2
an X-ray imaging system for acquiring X-ray projection data of the patient from a plurality of angular positions
Data Source
AI summary
A system for reconstructing a 3D volume has a surface acquisition system with a light source and an image sensor for characterizing the surface contour of a patient and an X-ray imaging system for acquiring X-ray projection data of the patient from a number of angular positions. A controller is programmed with instructions to synchronize the 3D surface contour characterization from the surface acquisition system with the acquired X-ray projection data. A processor executes a motion reduction method that uses the acquired X-ray projection data and the generated 3D surface contour characterization to reconstruct a 3D volume.