Motion-Compensated Medical Imaging via Virtual Trajectory
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Solution Overview
Problem
Medical imaging apparatuses face challenges in obtaining precise images due to motion artifacts caused by the movement of the X-ray source, detector, and object during scanning, leading to reduced image quality and diagnostic accuracy.
Innovation Solution
A medical imaging system that includes an X-ray source, detector, and image processor capable of determining motion parameters to generate a virtual trajectory of the X-ray source, compensating for motion by adjusting the back projection position and performing weighting and filtering processes based on the virtual trajectory, resulting in a motion-compensated image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion compensation is performed using traditional methods, then image quality is improved, but computational complexity and processing time increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values in a lookup table during system initialization or calibration phase. These pre-computed correction values are then directly applied during motion compensation without performing complex real-time calculations, thereby improving image quality while reducing computational complexity during actual operation.
Solution Approach 2:
The patent uses copying by creating a virtual trajectory model that replicates the actual X-ray source movement path. This virtual model is constructed based on measured motion parameters and stored as reference data. During reconstruction, the virtual trajectory is copied and applied to correct the actual trajectory deviations, enabling motion compensation without repeatedly computing complex transformation equations.
2Measurement precision
If motion parameters are calculated at every scan point, then image precision is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by calculating motion parameters only at selected key positions or control points along the scan trajectory rather than at every single scan point. The correction values derived from these partial calculations are then interpolated or extrapolated to cover the entire trajectory, achieving sufficient image precision while significantly reducing the number of computations required.
Solution Approach 2:
The patent pre-calculates motion parameters at critical positions and stores these values in advance. During the reconstruction process, these pre-computed values are retrieved and applied directly, avoiding the need to recalculate motion parameters at every scan point in real-time, thus reducing processing time while maintaining image precision.
3Object-affected harmful factors
If virtual trajectory generation is performed with high accuracy, then motion artifact reduction is improved, but computational load increases
Solution Approach 1:
The patent replaces complex mechanical calculation systems with a data-driven approach. Instead of performing complex real-time mathematical transformations to generate virtual trajectories, the system uses measured motion parameters to directly construct virtual trajectory models. This substitution of computational mechanics with empirical data reduces computational load while maintaining high accuracy in motion artifact reduction.
Solution Approach 2:
The patent creates a copied virtual representation of the X-ray source trajectory that includes motion corrections. This virtual trajectory is generated once based on measured motion data and then copied and applied during reconstruction, avoiding the need to repeatedly compute complex trajectory transformations for each projection angle, thereby reducing computational load while maintaining high accuracy.
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 enhances image quality by minimizing motion artifacts, allowing for more accurate diagnosis and reducing the computational load required to determine motion parameter values, thereby improving the precision of medical images.
Implementation Method 1
an X-ray source configured to irradiate X-rays; an X-ray detector configured to obtain raw data by detecting X-rays irradiated from the X-ray source
Data Source
AI summary
Disclosed herein are workstation, medical imaging apparatus having the same and method for controlling thereof. The medical imaging apparatus includes an X-ray source configured to irradiate X-rays; an X-ray detector configured to obtain raw data by detecting X-rays irradiated from the X-ray source; and an image processor configured to determine a motion parameter to represent motion of at least one of an object, the X-ray source, and the X-ray detector from a medical image reconstructed based on the obtained raw data, and reconstruct a motion-compensated medical image of the object based on a virtual trajectory of the X-ray source generated based on the determined motion parameter.