Angiographic Image Correction for Cardiac Motion Alignment
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Solution Overview
Problem
The positional deviation of medical devices on angiographic images due to patient movement, particularly heart pulsation and breathing, complicates procedures such as recanalization of chronic total occlusions, making it difficult for operators to accurately grasp the position and orientation of the medical device within the blood vessel.
Innovation Solution
A surgery assistance device that includes an angiographic image acquisition unit setting intervals corresponding to the heart's pulsation cycle to acquire images and an image correction unit that adjusts the position of specific device portions to match earlier images, reducing positional deviation by aligning with previous images, thereby improving accuracy and reducing movement-related errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If continuous angiographic imaging is performed to track medical device position, then real-time visualization is improved, but positional deviation due to heart pulsation and breathing still occurs making accurate position grasping difficult
Solution Approach 1:
The system performs image acquisition at periodic intervals synchronized with the heart pulsation cycle. By setting the time interval between consecutive angiographic images to correspond to one complete cardiac cycle, the system captures images when the heart returns to the same phase of pulsation, thereby eliminating positional deviation caused by cardiac motion while maintaining real-time visualization capability
Solution Approach 2:
The system uses electrocardiogram (ECG) signals as feedback to dynamically adjust the image acquisition timing. The ECG-triggered mechanism detects heart phase and triggers image capture at predetermined phases, creating a closed-loop system that compensates for cardiac-induced positional deviation and ensures accurate medical device position measurement
2Measurement precision
If image acquisition interval is increased to reduce heart pulsation impact, then positional deviation is reduced, but real-time tracking capability deteriorates
Solution Approach 1:
By acquiring images at periodic intervals matched to the heart cycle rather than continuously, the system reduces the number of images while maintaining synchronization with cardiac motion. This periodic sampling approach preserves real-time tracking capability for procedural guidance while minimizing positional deviation through phase-synchronized acquisition
Solution Approach 2:
The system maintains continuous monitoring capability by sequentially acquiring images at optimized intervals and using image correction to bridge temporal gaps. The correction process continuously adjusts for positional changes between acquired frames, ensuring uninterrupted real-time tracking without requiring continuous high-rate imaging
3Measurement precision
If multiple images are acquired and corrected sequentially to reduce positional deviation, then position accuracy is improved, but procedure time increases
Solution Approach 1:
The system performs preliminary correction of positional deviation using the periodically acquired images and ECG-synchronized timing information before final image display or analysis. By pre-correcting the images at the acquisition stage rather than requiring post-processing correction during procedure review, time is saved while maintaining high position accuracy
Solution Approach 2:
The system creates corrected copies of the acquired angiographic images by computationally adjusting for positional deviation based on ECG-triggered timing and heart phase information. These corrected image copies are generated rapidly and displayed in real-time, providing accurate position information without requiring multiple physical re-acquisitions or time-consuming manual correction processes
Data Source
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AI summary
A surgery assistance device includes an angiographic image acquisition unit that sets a time interval corresponding to a pulsation cycle of a heart as predetermined intervals and sequentially acquires an angiographic image representing a target blood vessel into which a medical device is inserted at the predetermined intervals, and an image correction unit that sequentially corrects the angiographic image sequentially acquired by the angiographic image acquisition unit, and that generates a corrected angiographic image by correcting the angiographic image to be corrected in such a manner that a position of a specific portion of the medical device included in the angiographic image to be corrected approaches a position of the specific portion of the medical device included in the angiographic image acquired temporally earlier than the angiographic image to be corrected.