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Soft tissue scanning for patient registration in image-guided surgery
Rüdiger Marmulla1, Stefan Hassfeld, Tim Lüth
1Department of Cranio-Maxillofacial Surgery, University of Heidelberg, Heidelberg, Germany. ruediger@marmulla.com
Summary
This study presents a markerless registration method for cranio-maxillofacial surgery using high-resolution laser scanning. The Surgical Segment Navigator SSN++ achieves accurate patient data alignment for image-guided interventions.
Area of Science:
- Medical Imaging
- Surgical Navigation
- Computer-Aided Surgery
Background:
- Accurate correlation between patient data and surgical site is crucial for image-guided surgery.
- Existing registration methods can be invasive or lack precision.
Purpose of the Study:
- To introduce and evaluate a novel markerless registration method for cranio-maxillofacial surgery.
- To assess the accuracy and stability of this method using high-resolution laser scanning.
Main Methods:
- A markerless registration technique based on high-resolution laser scanning of the patient's skin surface.
- The Surgical Segment Navigator SSN++ utilizes a 'bluescreen' technique to reject contaminated surface measurements.
- Accuracy was validated using intraoral titanium markers in twelve patients across varying laser scan resolutions.
Main Results:
- High-resolution laser scanning (300,000 points) achieved the best accuracy, with a mean deviation of 1.1 mm and a maximum deviation of 1.8 mm.
- Lower resolution scans (down to 3,750 points) resulted in significant inaccuracies, up to 6 mm.
- The markerless registration demonstrated stability and accuracy for cranio-maxillofacial surgical applications.
Conclusions:
- Markerless registration using high-resolution laser scanning is a viable and accurate method for cranio-maxillofacial surgery.
- The Surgical Segment Navigator SSN++ offers a precise solution for pre-operative data set alignment.
- Resolution of laser scanning significantly impacts the accuracy of the registration process.