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Augmented Reality during Open Liver Surgery Using a Markerless Non-rigid Registration System

  • Original Article
  • Published:
Journal of Gastrointestinal Surgery

Abstract

Introduction

Intraoperative navigation during liver resection remains difficult and requires high radiologic skills because liver anatomy is complex and patient-specific. Augmented reality (AR) during open liver surgery could be helpful to guide hepatectomies and optimize resection margins but faces many challenges when large parenchymal deformations take place. We aimed to experiment a new vision-based AR to assess its clinical feasibility and anatomical accuracy.

Patients and Methods

Based on preoperative CT scan 3-D segmentations, we applied a non-rigid registration method, integrating a physics-based elastic model of the liver, computed in real time using an efficient finite element method. To fit the actual deformations, the model was driven by data provided by a single RGB-D camera. Five livers were considered in this experiment. In vivo AR was performed during hepatectomy (n = 4), with manual handling of the livers resulting in large realistic deformations. Ex vivo experiment (n = 1) consisted in repeated CT scans of explanted whole organ carrying internal metallic landmarks, in fixed deformations, and allowed us to analyze our estimated deformations and quantify spatial errors.

Results

In vivo AR tests were successfully achieved in all patients with a fast and agile setup installation (< 10 min) and real-time overlay of the virtual anatomy onto the surgical field displayed on an external screen. In addition, an ex vivo quantification demonstrated a 7.9 mm root mean square error for the registration of internal landmarks.

Conclusion

These first experiments of a markerless AR provided promising results, requiring very little equipment and setup time, yet providing real-time AR with satisfactory 3D accuracy. These results must be confirmed in a larger prospective study to definitively assess the impact of such minimally invasive technology on pathological margins and oncological outcomes.

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Abbreviations

AR:

Augmented reality

FEM:

Finite element method

FPS:

Frame per second

P:

Patient

RGB-D camera:

Red Green Blue-depth camera

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Authors and Affiliations

Authors

Contributions

N Golse and A Petit: wrote manuscript, performed experiments. M Lewin: CT scan acquisition, images analysis. S Cotin and E Vibert: research supervision, manuscript rewriting, scientific advices.

Corresponding author

Correspondence to Nicolas Golse.

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The authors declare that they have no conflict of interest.

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Golse, N., Petit, A., Lewin, M. et al. Augmented Reality during Open Liver Surgery Using a Markerless Non-rigid Registration System. J Gastrointest Surg 25, 662–671 (2021). https://doi.org/10.1007/s11605-020-04519-4

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  • DOI: https://doi.org/10.1007/s11605-020-04519-4

Keywords

Navigation