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Published in: International Journal of Computer Assisted Radiology and Surgery 5/2019

01-05-2019 | Oral and Maxillofacial Surgery | Original Article

A practical marker-less image registration method for augmented reality oral and maxillofacial surgery

Authors: Junchen Wang, Yu Shen, Shuo Yang

Published in: International Journal of Computer Assisted Radiology and Surgery | Issue 5/2019

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Abstract

Background

Image registration lies in the core of augmented reality (AR), which aligns the virtual scene with the reality. In AR surgical navigation, the performance of image registration is vital to the surgical outcome.

Methods

This paper presents a practical marker-less image registration method for AR-guided oral and maxillofacial surgery where a virtual scene is generated and mixed with reality to guide surgical operation or provide surgical outcome visualization in the manner of video see-through overlay. An intraoral 3D scanner is employed to acquire the patient’s teeth shape model intraoperatively. The shape model is then registered with a custom-made stereo camera system using a novel 3D stereo matching algorithm and with the patient’s CT-derived 3D model using an iterative closest point scheme, respectively. By leveraging the intraoral 3D scanner, the CT space and the stereo camera space are associated so that surrounding anatomical models and virtual implants could be overlaid on the camera’s view to achieve AR surgical navigation.

Results

Jaw phantom experiments were performed to evaluate the target registration error of the overlay, which yielded an average error of less than 0.50 mm with the time cost less than 0.5 s. Volunteer trial was also conducted to show the clinical feasibility.

Conclusions

The proposed registration method does not rely on any external fiducial markers attached to the patient. It performs automatically so as to maintain a correct AR scene, overcoming the misalignment difficulty caused by patient’s movement. Therefore, it is noninvasive and practical in oral and maxillofacial surgery.
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Metadata
Title
A practical marker-less image registration method for augmented reality oral and maxillofacial surgery
Authors
Junchen Wang
Yu Shen
Shuo Yang
Publication date
01-05-2019
Publisher
Springer International Publishing
Published in
International Journal of Computer Assisted Radiology and Surgery / Issue 5/2019
Print ISSN: 1861-6410
Electronic ISSN: 1861-6429
DOI
https://doi.org/10.1007/s11548-019-01921-5

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