Radiography Apparatus Dynamic Marker Alignment for Moving Stents
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Solution Overview
Problem
Current radiography technologies face challenges in accurately positioning moving target objects, such as stents or prosthetic valves, during procedures like PTCA and TAVR, due to inadequate display of location, direction, and size, which can lead to erroneous placement and potentially fatal consequences.
Innovation Solution
A radiography apparatus that generates time-series radiographs, extracts feature points, determines display locations, and generates correction images to align feature points accurately, ensuring the moving target object is displayed in adequate location, direction, and size, using a combination of feature point location acquisition, display-location determination, and correction image generation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If feature point alignment is performed using fixed location methods (first frame or predetermined location), then the alignment process is simplified, but the target object cannot be displayed in adequate location, direction and size
Solution Approach 1:
The patent applies dynamics by making the display location of the target object changeable based on its actual position in each frame. Instead of using a fixed predetermined location, the system dynamically adjusts the display location to match the target object's position, ensuring accurate representation while maintaining relatively simple alignment processing.
2Productivity
If feature point location is fixed to first frame or predetermined location, then processing is simpler, but information on inherent direction and size of target object is lost
Solution Approach 1:
The patent implements feedback by using the detected position information of the target object to determine its display location. The system continuously monitors the target object's position in each frame and adjusts the display accordingly, ensuring that information about the target object's direction and size is preserved and accurately represented without requiring complex processing.
3Ease of operation
If real-time display of moving target object is implemented, then operator can monitor positioning, but accurate positioning becomes difficult due to movement
Solution Approach 1:
The patent resolves this contradiction by dynamically tracking the target object's position in real-time. The system detects the target object's location in each frame and adjusts the display to maintain accurate positioning information despite the object's movement, allowing operators to monitor positioning accurately while the object moves.
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 apparatus effectively maintains the information of direction and size of the target object, allowing for intuitive distinction between proximal and distant blood vessels and accurate positioning of devices, reducing the risk of errors during procedures.
Implementation Method 1
such a predetermined target object is a blood vessel of a subject and a device being inserted into the inside of the body of the subject. Hereinafter, the inventor sets forth e.g., an X-ray as such a radiation.
Data Source
AI summary
A radiography apparatus sequentially determines, on the basis of the positions of markers as time-sequential feature points (of a plurality of frames), positions at which the markers in the frames are displayed. This makes it possible to display a moving object while the position, direction and size thereof are properly set. Another advantage is that when a plurality of markers are extracted, information relating to the direction and size of the object is retained and the proximal and distal directions of the object and the length of a device (e.g., stent) can be intuitively determined from an image. Since positioning is performed using the plurality of positions of markers and the plurality of display positions, the position and direction of a corrected image to be finally displayed can also be set properly.