Fast and accurate online calibration of optical see-through head-mounted display for AR-based surgical navigation using
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ORIGINAL ARTICLE
Fast and accurate online calibration of optical see-through head-mounted display for AR-based surgical navigation using Microsoft HoloLens Qichang Sun1
· Yongfeng Mai1 · Rong Yang2 · Tong Ji2 · Xiaoyi Jiang3 · Xiaojun Chen1
Received: 18 January 2020 / Accepted: 7 August 2020 © CARS 2020
Abstract Purpose: The use of an optical see-through head-mounted display (OST-HMD) in augmented reality (AR) has significantly increased in recent years, but the alignment between the virtual scene and physical reality is still a challenge. A fast and accurate calibration method of OST-HMD is important for augmented reality in the medical field. Methods: We proposed a fast online calibration procedure for OST-HMD with the aid of an optical tracking system. Two 3D datasets are collected in this procedure: the virtual points rendered in front of the observer’s eyes and the corresponding points in optical tracking space. The transformation between these two 3D coordinates is solved to build the connection between virtual and real space. An AR-based surgical navigation system is developed with the help of this procedure, which is used for experiment verification and clinical trial. Results: Phantom experiment based on the 3D-printed skull is performed, and the average root-mean-square error of control points between rendered object and skull model is 1.30 ± 0.39 mm, and the time consumption of the calibration procedure can be less than 30 s. A clinical trial is also conducted to show the feasibility in real surgery theatre. Conclusions: The proposed calibration method does not rely on the camera of the OST-HMD and is very easy to operate. Phantom experiment and clinical case demonstrated the feasibility of our AR-based surgical navigation system and indicated it has the potential in clinical application. Keywords Augmented reality · Calibration · Microsoft HoloLens · Surgical navigation
Introduction With the fast development of computer graphics and medical image analysis, augmented reality (AR) has become one of the research focuses in medical fields with potential uses in training, planning, and navigation. A review [6] introduced Qichang Sun and Yongfeng Mai have contributed equally to this work.
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Xiaojun Chen [email protected]
1
Institute of Biomedical Manufacturing and Life Quality Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
2
Department of Oral Maxillofacial - Headneck Oncology, Shanghai Ninth People’s Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
3
Faculty of Mathematics and Computer Science, University of Münster, Einsteinstrasse 62, 48149 Münster, Germany
AR developments in treatment guidance [8], patient rehabilitation [15], surgical navigation [18], training of medical procedures, and education. The optical see-through head-mounted display has lots of advantages in augmented reality applications, and it can provide the user with an immersive experience in different situations. Lots of w
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