Optical Shape Sensing for Cross-Modal Interventional Device Tracking
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Solution Overview
Problem
Current optical shape sensing technologies for interventional medical devices face registration errors with X-Ray and ultrasound imaging systems, leading to interruptions and increased X-Ray exposure during procedures due to the need for re-registration and additional imaging.
Innovation Solution
A system that integrates optical shape sensing with a controller and interface to accurately maintain registration between X-Ray and ultrasound imaging systems by using three-dimensional segmentation and on-demand re-registration without additional X-Ray imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If re-registration is performed using additional X-Ray projections, then registration accuracy is improved, but procedure time increases and patient/clinician X-Ray dosage increases
Solution Approach 1:
The patent introduces an intermediary object (the markerless fiducial markers embedded in the optical shape sensing device) that enables registration between different imaging modalities without requiring additional X-Ray projections. The markers are visible in both optical and X-Ray imaging, serving as a bridge for coordinate system transformation and eliminating the need for re-registration with additional X-Ray images.
Solution Approach 2:
The patent performs preliminary registration by embedding fiducial markers in the optical shape sensing device before the interventional procedure begins. This preliminary setup establishes the coordinate transformation relationships between optical and X-Ray imaging systems in advance, so that when re-registration is needed during the procedure, the system can quickly recalculate transformations using the pre-positioned markers rather than requiring new X-Ray projections.
2Measurement precision
If re-registration is performed with additional X-Ray projections, then registration accuracy is improved, but patient and clinician X-Ray dosage increases
Solution Approach 1:
The fiducial markers embedded in the optical shape sensing device serve as an intermediary that is visible in both optical and X-Ray imaging modalities. This allows the system to perform registration and re-registration by detecting the known positions of these markers in the X-Ray images, eliminating the need for additional dedicated X-Ray projection images and thereby reducing cumulative X-Ray exposure to patients and clinicians.
3Measurement precision
If image analysis software searches through latest ultrasound imagery for OSS device, then registration is updated, but procedure time increases
Solution Approach 1:
The patent applies local quality by embedding fiducial markers at specific locations on the optical shape sensing device. These markers have distinct visual characteristics that make them easily identifiable in both optical and ultrasound imagery. The image analysis software can quickly locate these known markers rather than searching through entire ultrasound volumes, significantly reducing the time required for re-registration while maintaining accuracy.
4Productivity
If user designates OSS device tip in ultrasound imagery, then search is constrained, but operation complexity increases
Solution Approach 1:
The patent implements self-service by designing the optical shape sensing device with embedded fiducial markers that automatically provide location information to the tracking system. The markers' known positions and distinctive appearance allow the system to automatically identify and track the device without requiring manual user designation of the tip or other features, reducing operational complexity while maintaining high registration speed.
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 continuous and accurate tracking of interventional medical devices across multiple imaging modalities, reducing procedure time and X-Ray exposure by dynamically updating registrations based on segmented representations.
Implementation Method 1
The principle involved makes use of distributed strain measurements in the optical fiber using characteristic Rayleigh backscatter or controlled grating patterns
Data Source
AI summary
A system includes an interface (193) to an optical shape sensing device (102) with a shape conforming to a shape of an interventional medical device (01). The system also includes a controller (190) with a memory (191) that stores instructions and a processor (192) that executes the instructions. The instructions cause the system to identify a shape of the optical shape sensing device (102) using optical shape sensing signals received via the interface (193), identify the interventional medical device (01) in disparate coordinate spaces of imaging systems that image the interventional medical device (01) in disparate imaging modes, and register the coordinate spaces to each other and to the interventional medical device (01). The instructions also cause the system to obtain a segmented representation (401) of the interventional medical device (01), and re-register the interventional medical device (01) to one of the coordinate space based on registering the interventional medical device (01) to another of the coordinate spaces using the segmented representation (401).