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IEEE J Biomed Health Inform ; 23(6): 2483-2493, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-30530379


Augmented reality (AR) surgical navigation systems based on image overlay have been used in minimally invasive surgery. However, conventional systems still suffer from a limited viewing zone, a shortage of intuitive three-dimensional (3D) image guidance and cannot be moved freely. To fuse the 3-D overlay image with the patient in situ, it is essential to track the overlay device while it is moving. A direct line-of-sight should be maintained between the optical markers and the tracker camera. In this study, we propose a moving-tolerant AR surgical navigation system using autostereoscopic image overlay, which can avoid the use of the optical tracking system during the intraoperative period. The system captures binocular image sequences of environmental change in the operation room to locate the overlay device, rather than tracking the device directly. Therefore, it is no longer required to maintain a direct line-of-sight between the tracker and the tracked devices. The movable range of the system is also not limited by the scope of the tracker camera. Computer simulation experiments demonstrate the reliability of the proposed moving-tolerant AR surgical navigation system. We also fabricate a computer-generated integral photography-based 3-D overlay AR system to validate the feasibility of the proposed moving-tolerant approach. Qualitative and quantitative experiments demonstrate that the proposed system can always fuse the 3-D image with the patient, thus, increasing the feasibility and reliability of traditional 3-D overlay image AR surgical navigation systems.

Med Biol Eng Comput ; 57(1): 47-57, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29967935


It is challenging to achieve high implant accuracy in dental implant placement, because high risk tissues need to be avoided. In this study, we present an augmented reality (AR) surgical navigation with an accurate cone beam computed tomography (CBCT)-patient registration method to provide clinically desired dental implant accuracy. A registration device is used for registration between preoperative data and patient outside the patient's mouth. After registration, the registration device is worn on the patient's teeth for tracking the patient. Naked-eye 3D images of the planning path and the mandibular nerve are superimposed onto the patient in situ to form an AR scene. Simultaneously, a 3D image of the drill is overlaid accurately on the real one to guide the implant procedure. Finally, implant accuracy is evaluated postoperatively. A model experiment was performed by an experienced dentist. Totally, ten parallel pins were inserted into five 3D-printed mandible models guided by our AR navigation method and through the dentist's experience, respectively. AR-guided dental implant placement showed better results than the dentist's experience (mean target error = 1.25 mm vs. 1.63 mm; mean angle error = 4.03° vs. 6.10°). Experimental results indicate that the proposed method is expected to be applied in the clinic. Graphical abstract ᅟ.

Tomografia Computadorizada de Feixe Cônico , Implantes Dentários , Imagem Tridimensional , Calibragem , Humanos , Mandíbula/inervação , Mandíbula/cirurgia , Cirurgia Assistida por Computador
Adv Exp Med Biol ; 1093: 193-205, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30306483


Augmented reality (AR) techniques play an important role in the field of minimally invasive surgery for orthopedics. AR can improve the hand-eye coordination by providing surgeons with the merged surgical scene, which enables surgeons to perform surgical operations more easily. To display the navigation information in the AR scene, medical image processing and three-dimensional (3D) visualization of the important anatomical structures are required. As a promising 3D display technique, integral videography (IV) can produce an autostereoscopic image with full parallax and continuous viewing points. Moreover, IV-based 3D AR navigation technique is proposed to present intuitive scene and has been applied in orthopedics, including oral surgery and spine surgery. The accurate patient-image registration, as well as the real-time target tracking for surgical tools and the patient, can be achieved. This paper overviews IV-based AR navigation and the applications in orthopedics, discusses the infrastructure required for successful implementation of IV-based approaches, and outlines the challenges that must be overcome for IV-based AR navigation to advance further development.

Imagem Tridimensional , Procedimentos Cirúrgicos Bucais , Ortopedia , Cirurgia Assistida por Computador , Humanos , Processamento de Imagem Assistida por Computador , Interface Usuário-Computador