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Localization of sentinel lymph nodes using augmented-reality system: a cadaveric feasibility study.
Heying Duan1, Yue Yang2, Wally L Niu2
1Department of Radiology, Division of Nuclear Medicine and Molecular Imaging, Stanford University, 300 Pasteur Drive, H2200, Stanford, CA, 94305, USA.
European Journal of Nuclear Medicine and Molecular Imaging
|March 24, 2025
Summary
Augmented reality (AR) precisely locates sentinel lymph nodes (SLNs) for melanoma staging, significantly reducing localization errors and surgical time compared to traditional methods.
Area of Science:
- Medical Imaging
- Surgical Technology
- Oncology
Background:
- Sentinel lymph node biopsy (SLNB) is crucial for melanoma staging.
- Current pre-surgical imaging (SPECT/CT) and intraoperative tools offer limited precision for SLN localization.
Purpose of the Study:
- To evaluate the accuracy and efficiency of an augmented reality (AR) system for precise SLN localization and extraction.
- To compare AR-guided localization with standard manual methods.
Main Methods:
- An AR system projected virtual 3D renderings from PET/MRI scans onto cadavers.
- The system utilized HoloLens 2 and custom software for visualization.
- Surgical procedures were performed using standard, AR, and AR with head movement compensation techniques.
Main Results:
- The AR system achieved a mean surface localization error of 2.5 mm and depth error of 2.3 mm.
- AR significantly reduced localization errors compared to manual marking (2.5 mm vs. 18.6 mm).
- Task completion time was reduced by 74% with the AR system.
Conclusions:
- The AR system offers high accuracy and efficiency for SLN localization.
- Integrating head-movement compensation and 3D visualization enhances precision.
- This technology has the potential to reduce operating room time in SLNB procedures.
