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Augmented reality with HoloLens in parotid surgery: how to assess and to improve accuracy

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Abstract

Purpose

Augmented reality improves planning and execution of surgical procedures. The aim of this study was to evaluate the feasibility of a 3D augmented reality hologram in live parotic surgery. Another goal was to develop an accuracy measuring instrument and to determine the accuracy of the system.

Methods

We created a software to build and manually align 2D and 3D augmented reality models generated from MRI data onto the patient during surgery using the HoloLens® 1 (Microsoft Corporation, Redmond, USA). To assess the accuracy of the system, we developed a specific measuring tool applying a standard electromagnetic navigation device (Fiagon GmbH, Hennigsdorf, Germany).

Results

The accuracy of our system was measured during real surgical procedures. Training of the experimenters and the use of fiducial markers significantly reduced the accuracy of holographic system (p = 0.0166 and p = 0.0132). Precision of the developed measuring system was very high with a mean error of the basic system of 1.3 mm. Feedback evaluation demonstrated 86% of participants agreed or strongly agreed that the HoloLens will play a role in surgical education. Furthermore, 80% of participants agreed or strongly agreed that the HoloLens is feasible to be introduced in clinical routine and will play a role within surgery in the future.

Conclusion

The use of fiducial markers and repeated training reduces the positional error between the hologram and the real structures. The developed measuring device under the use of the Fiagon navigation system is suitable to measure accuracies of holographic augmented reality images of the HoloLens.

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Acknowledgements

We would like to thank the Fraunhofer Institute in Mannheim and DFC-SYSTEMS GmbH, Munich for making the HoloLens available.

Funding

The authors did not receive any funding.

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Correspondence to Claudia Scherl.

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Conflicts of interest

The authors have no conflicts of interest to declare.

Ethics approval

The research was conducted ethically in accordance with the World Medical Association Declaration of Helsinki. Subjects have given their written informed consent and the study protocol was approved by the institute’s committee of ethics (#2019-739 N). The setup of the current study did not impose any additional risks to patients or surgeons, because they were not subject to any specific procedure, nor were they required to follow any new rules of behavior. Diagnostics and surgery were performed without any deviation from the standard procedure.

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Informed consent was obtained from all individual participants included in the study.

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Scherl, C., Stratemeier, J., Karle, C. et al. Augmented reality with HoloLens in parotid surgery: how to assess and to improve accuracy. Eur Arch Otorhinolaryngol 278, 2473–2483 (2021). https://doi.org/10.1007/s00405-020-06351-7

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  • DOI: https://doi.org/10.1007/s00405-020-06351-7

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