X-ray Stent Imaging Correction via Marker Shift
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Solution Overview
Problem
Conventional X-ray diagnostic apparatuses face challenges in clearly depicting the minute strut of stents due to difficulties in observing the strut itself and maintaining positioning accuracy, leading to high costs and complex correction methods.
Innovation Solution
An X-ray diagnostic apparatus and method that includes a data acquiring unit and a data processing unit to generate second three-dimensional image data by correcting X-ray projection data using shift amounts, along with a stent design featuring markers arranged to prevent overlap, allowing for improved image reconstruction and positional correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vibration correction methods using vibration tables are employed, then positioning accuracy can be improved, but device complexity and cost increase due to high reproducibility requirements
Solution Approach 1:
The patent replaces complex mechanical vibration correction systems with a computational approach. Instead of using vibration tables and mechanical stabilization mechanisms, the invention uses image processing algorithms to correct motion artifacts in the reconstructed images. The system acquires multiple projection images during rotation and applies correction algorithms to compensate for vibrations and positioning errors, thereby achieving high positioning accuracy without complex mechanical systems.
2Measurement precision
If mechanical stability improvements and position sensors are added to correct rotation system changes, then positioning accuracy can be improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical stabilization systems and position sensors with an image-based correction method. The system acquires multiple projection images at different rotation angles and uses computational algorithms to detect and correct positioning errors and vibrations. This computational approach eliminates the need for additional mechanical components while achieving the same positioning accuracy.
Solution Approach 2:
The patent creates a virtual model of the stent and its markers through image reconstruction, then uses this copied representation to detect and correct positioning errors. By reconstructing three-dimensional images from multiple projection images and analyzing the positions of markers in the reconstructed images, the system can identify and correct deviations without needing physical position sensors.
3Difficulty of detecting and measuring
If markers are added to stent to enable observation by X-ray diagnostic apparatus, then detectability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the parameters of existing stent components to improve detectability. Specifically, it utilizes the inherent markers or reference structures that are already part of the stent design, and optimizes their visibility characteristics for X-ray imaging. The system adjusts imaging parameters and processing algorithms to enhance the contrast and detectability of these markers without requiring additional manufacturing steps.
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
Enables clearer depiction of the stent strut with enhanced positional accuracy, reducing costs and complexity in image reconstruction, and improving the stability of the X-ray diagnostic process.
Implementation Method 1
an X-ray tube 6 and an X-ray detector 7
Implementation Method 2
an X-ray detector 7 having a high spatial resolution
Data Source
AI summary
According to one embodiment, an X-ray diagnostic apparatus includes a data acquiring unit and a data processing unit. The data acquiring unit acquires X-ray projection data corresponding to plural directions from an object in which a stent having markers has been inserted by exposing X-rays to the object from the plural directions. The data processing unit obtains a spatial position corresponding to at least one marker out of the markers based on first three dimensional image data generated by first image reconstruction processing of the X-ray projection data to generate second three dimensional image data by second image reconstruction processing of the X-ray projection data with a correction using a shift amount obtained based on the X-ray projection data and projected data of the one marker on a projected plane of the X-ray projection data.