Surgical Instrument Tracking via Fiducial Segmentation
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Solution Overview
Problem
In port-based surgery, there is a challenge in accurately tracking the depth penetration of surgical instruments within the brain due to limited visibility and potential trauma from access ports, leading to unintentional impact with healthy tissue and increased trauma to the brain matter.
Innovation Solution
A system using a monocular imaging sensor with a collinear array of active fiducial markers on medical instruments, allowing for 3D tracking by segmenting and calculating the orientation and position of the instruments within a virtual space, reducing the footprint of equipment while enhancing visualization and reducing trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear array of active fiducial markers is used on surgical instruments, then 3D tracking precision and depth penetration visualization are improved, but device complexity and equipment footprint increase
Solution Approach 1:
The surgical instrument is segmented by placing multiple discrete fiducial markers at known positions along its length. Each marker can be independently detected and segmented from the image, allowing the system to reconstruct the instrument's 3D position and orientation through computational geometry rather than requiring a complex monolithic tracker.
Solution Approach 2:
The system transitions from 2D camera images to 3D spatial tracking by using the known geometric relationships between multiple fiducial markers. The collinear arrangement of markers along the instrument's axis provides the additional dimensional information needed to calculate depth penetration and orientation in three-dimensional space from two-dimensional image data.
2Ease of operation
If access ports are used to provide surgical access, then surgical intervention capability is improved, but trauma to brain tissue and risk of unintentional impact increase
Solution Approach 1:
The system provides real-time feedback by continuously tracking the position of surgical instruments relative to the access port and brain tissue. The image processing system segments fiducial markers and calculates instrument depth penetration, providing visual feedback to the surgeon about instrument position and orientation, enabling precise control to minimize trauma and avoid unintentional impact with healthy tissue.
Solution Approach 2:
The system replaces direct mechanical visualization and measurement methods with optical imaging and computational tracking. Instead of relying on physical markers or direct visual contact with brain tissue, the system uses camera-based image capture, digital segmentation of fiducial markers, and computational calculation of 3D positions to monitor and control instrument penetration, reducing mechanical trauma.
3Reliability
If multiple tracking components are used to ensure accurate instrument positioning, then measurement reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
The camera system serves multiple functions: it captures images of fiducial markers for tracking, provides visual feedback for surgical guidance, and enables computational calculation of 3D positions. This multi-functional approach replaces the need for separate specialized tracking devices, reducing overall equipment footprint while maintaining positioning accuracy through image-based segmentation and geometric calculation.
Data Source
AI summary
A system for tracking a piece of medical equipment intraoperatively using a collinear array of fiducial markers positioned at known fixed distances relative to each other on the medical equipment and a camera capturing an image on a single image plane. Representations of the fiducial markers are segmented from a captured image, 3D orientation and position of the medical equipment are calculated using the segmented representations, and the orientation and position of the medical equipment are tracked relative to the camera. The orientation and position of the medical equipment may be registered within a 3D virtual space. The system may be used as part of a surgical navigation system.