The Experts below are selected from a list of 3486 Experts worldwide ranked by ideXlab platform
Wei Huang - One of the best experts on this subject based on the ideXlab platform.
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accuracy of a real time Surgical Navigation System for the placement of quad zygomatic implants in the severe atrophic maxilla a pilot clinical study
Clinical Implant Dentistry and Related Research, 2017Co-Authors: Kuofeng Hung, Feng Wang, Haowei Wang, Wenjie Zhou, Wei HuangAbstract:BACKGROUND A real-time Surgical Navigation System potentially increases the accuracy when used for quad-zygomatic implant placement. PURPOSE To evaluate the accuracy of a real-time Surgical Navigation System when used for quad zygomatic implant placement. MATERIALS AND METHODS Patients with severely atrophic maxillae were prospectively recruited. Four trajectories for implants were planned, and zygomatic implants were placed using a real-time Surgical Navigation System. The planned-placed distance deviations at entry (entry deviation）points, exit (exit deviation) points, and angle deviation of axes (angle deviation) were measured on fused operation images. The differences of all the deviations between different groups, classified based on the lengths and locations of implants, were analysed. A P value of < 0.05 indicated statistical significance. RESULTS Forty zygomatic implants were placed as planned in 10 patients. The entry deviation, exit deviation and angle deviation were 1.35 ± 0.75 mm, 2.15 mm ± 0.95 mm, and 2.05 ± 1.02 degrees, respectively. The differences of all deviations were not significant, irrespective of the lengths (P = .259, .158, and .914, respectively) or locations of the placed implants (P = .698, .072, and .602, respectively). CONCLUSION A real-time Surgical Navigation System used for the placement of quad zygomatic implants demonstrated a high level of accuracy with only minimal planned-placed deviations, irrespective of the lengths or locations of the implants.
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Accuracy of a real-time Surgical Navigation System for the placement of quad zygomatic implants in the severe atrophic maxilla: A pilot clinical study.
Clinical Implant Dentistry and Related Research, 2017Co-Authors: Kuofeng Hung, Feng Wang, Haowei Wang, Wenjie Zhou, Wei HuangAbstract:BACKGROUND A real-time Surgical Navigation System potentially increases the accuracy when used for quad-zygomatic implant placement. PURPOSE To evaluate the accuracy of a real-time Surgical Navigation System when used for quad zygomatic implant placement. MATERIALS AND METHODS Patients with severely atrophic maxillae were prospectively recruited. Four trajectories for implants were planned, and zygomatic implants were placed using a real-time Surgical Navigation System. The planned-placed distance deviations at entry (entry deviation）points, exit (exit deviation) points, and angle deviation of axes (angle deviation) were measured on fused operation images. The differences of all the deviations between different groups, classified based on the lengths and locations of implants, were analysed. A P value of
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Real-Time Surgical Navigation System for the Placement of Zygomatic Implants with Severe Bone Deficiency.
The International Journal of Oral & Maxillofacial Implants, 2016Co-Authors: Kuofeng Hung, Wei Huang, Feng WangAbstract:This case report describes the clinical application of a real-time Surgical Navigation System to guide zygomatic implants on their placement. With the assistance of this novel Navigation System, constant visualization of the drilling trajectory and exact control of the drilling direction can be achieved, which could minimize the risk of penetration into critical anatomical structures. Moreover, implants might be accurately placed in accordance to the preoperative planned position. In this patient, who had previously undergone a hemimaxillectomy, three zygomatic implants were placed on the unilateral zygoma, and two conventional implants were placed on the unresected maxilla. Measurement of distributive deviation of implants between preoperative planning and the postoperative result showed the mean linear deviations at the entrance and apical point of the implant were 1.07 ± 0.15 mm (range: 0.9 to 1.1 mm) and 1.20 ± 0.46 mm (range: 0.7 to 1.6 mm), respectively. The mean angle deviation between the axes of the planned and the actual implant was 1.37 ± 0.21 degrees (range: 1.2 to 1.3 degrees). Therefore, this Surgical Navigation System represents a reliable approach to guide the placement of zygomatic implants.
Kuofeng Hung - One of the best experts on this subject based on the ideXlab platform.
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accuracy of a real time Surgical Navigation System for the placement of quad zygomatic implants in the severe atrophic maxilla a pilot clinical study
Clinical Implant Dentistry and Related Research, 2017Co-Authors: Kuofeng Hung, Feng Wang, Haowei Wang, Wenjie Zhou, Wei HuangAbstract:BACKGROUND A real-time Surgical Navigation System potentially increases the accuracy when used for quad-zygomatic implant placement. PURPOSE To evaluate the accuracy of a real-time Surgical Navigation System when used for quad zygomatic implant placement. MATERIALS AND METHODS Patients with severely atrophic maxillae were prospectively recruited. Four trajectories for implants were planned, and zygomatic implants were placed using a real-time Surgical Navigation System. The planned-placed distance deviations at entry (entry deviation）points, exit (exit deviation) points, and angle deviation of axes (angle deviation) were measured on fused operation images. The differences of all the deviations between different groups, classified based on the lengths and locations of implants, were analysed. A P value of < 0.05 indicated statistical significance. RESULTS Forty zygomatic implants were placed as planned in 10 patients. The entry deviation, exit deviation and angle deviation were 1.35 ± 0.75 mm, 2.15 mm ± 0.95 mm, and 2.05 ± 1.02 degrees, respectively. The differences of all deviations were not significant, irrespective of the lengths (P = .259, .158, and .914, respectively) or locations of the placed implants (P = .698, .072, and .602, respectively). CONCLUSION A real-time Surgical Navigation System used for the placement of quad zygomatic implants demonstrated a high level of accuracy with only minimal planned-placed deviations, irrespective of the lengths or locations of the implants.
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Accuracy of a real-time Surgical Navigation System for the placement of quad zygomatic implants in the severe atrophic maxilla: A pilot clinical study.
Clinical Implant Dentistry and Related Research, 2017Co-Authors: Kuofeng Hung, Feng Wang, Haowei Wang, Wenjie Zhou, Wei HuangAbstract:BACKGROUND A real-time Surgical Navigation System potentially increases the accuracy when used for quad-zygomatic implant placement. PURPOSE To evaluate the accuracy of a real-time Surgical Navigation System when used for quad zygomatic implant placement. MATERIALS AND METHODS Patients with severely atrophic maxillae were prospectively recruited. Four trajectories for implants were planned, and zygomatic implants were placed using a real-time Surgical Navigation System. The planned-placed distance deviations at entry (entry deviation）points, exit (exit deviation) points, and angle deviation of axes (angle deviation) were measured on fused operation images. The differences of all the deviations between different groups, classified based on the lengths and locations of implants, were analysed. A P value of
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Real-Time Surgical Navigation System for the Placement of Zygomatic Implants with Severe Bone Deficiency.
The International Journal of Oral & Maxillofacial Implants, 2016Co-Authors: Kuofeng Hung, Wei Huang, Feng WangAbstract:This case report describes the clinical application of a real-time Surgical Navigation System to guide zygomatic implants on their placement. With the assistance of this novel Navigation System, constant visualization of the drilling trajectory and exact control of the drilling direction can be achieved, which could minimize the risk of penetration into critical anatomical structures. Moreover, implants might be accurately placed in accordance to the preoperative planned position. In this patient, who had previously undergone a hemimaxillectomy, three zygomatic implants were placed on the unilateral zygoma, and two conventional implants were placed on the unresected maxilla. Measurement of distributive deviation of implants between preoperative planning and the postoperative result showed the mean linear deviations at the entrance and apical point of the implant were 1.07 ± 0.15 mm (range: 0.9 to 1.1 mm) and 1.20 ± 0.46 mm (range: 0.7 to 1.6 mm), respectively. The mean angle deviation between the axes of the planned and the actual implant was 1.37 ± 0.21 degrees (range: 1.2 to 1.3 degrees). Therefore, this Surgical Navigation System represents a reliable approach to guide the placement of zygomatic implants.
Feng Wang - One of the best experts on this subject based on the ideXlab platform.
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accuracy of a real time Surgical Navigation System for the placement of quad zygomatic implants in the severe atrophic maxilla a pilot clinical study
Clinical Implant Dentistry and Related Research, 2017Co-Authors: Kuofeng Hung, Feng Wang, Haowei Wang, Wenjie Zhou, Wei HuangAbstract:BACKGROUND A real-time Surgical Navigation System potentially increases the accuracy when used for quad-zygomatic implant placement. PURPOSE To evaluate the accuracy of a real-time Surgical Navigation System when used for quad zygomatic implant placement. MATERIALS AND METHODS Patients with severely atrophic maxillae were prospectively recruited. Four trajectories for implants were planned, and zygomatic implants were placed using a real-time Surgical Navigation System. The planned-placed distance deviations at entry (entry deviation）points, exit (exit deviation) points, and angle deviation of axes (angle deviation) were measured on fused operation images. The differences of all the deviations between different groups, classified based on the lengths and locations of implants, were analysed. A P value of < 0.05 indicated statistical significance. RESULTS Forty zygomatic implants were placed as planned in 10 patients. The entry deviation, exit deviation and angle deviation were 1.35 ± 0.75 mm, 2.15 mm ± 0.95 mm, and 2.05 ± 1.02 degrees, respectively. The differences of all deviations were not significant, irrespective of the lengths (P = .259, .158, and .914, respectively) or locations of the placed implants (P = .698, .072, and .602, respectively). CONCLUSION A real-time Surgical Navigation System used for the placement of quad zygomatic implants demonstrated a high level of accuracy with only minimal planned-placed deviations, irrespective of the lengths or locations of the implants.
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Accuracy of a real-time Surgical Navigation System for the placement of quad zygomatic implants in the severe atrophic maxilla: A pilot clinical study.
Clinical Implant Dentistry and Related Research, 2017Co-Authors: Kuofeng Hung, Feng Wang, Haowei Wang, Wenjie Zhou, Wei HuangAbstract:BACKGROUND A real-time Surgical Navigation System potentially increases the accuracy when used for quad-zygomatic implant placement. PURPOSE To evaluate the accuracy of a real-time Surgical Navigation System when used for quad zygomatic implant placement. MATERIALS AND METHODS Patients with severely atrophic maxillae were prospectively recruited. Four trajectories for implants were planned, and zygomatic implants were placed using a real-time Surgical Navigation System. The planned-placed distance deviations at entry (entry deviation）points, exit (exit deviation) points, and angle deviation of axes (angle deviation) were measured on fused operation images. The differences of all the deviations between different groups, classified based on the lengths and locations of implants, were analysed. A P value of
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Real-Time Surgical Navigation System for the Placement of Zygomatic Implants with Severe Bone Deficiency.
The International Journal of Oral & Maxillofacial Implants, 2016Co-Authors: Kuofeng Hung, Wei Huang, Feng WangAbstract:This case report describes the clinical application of a real-time Surgical Navigation System to guide zygomatic implants on their placement. With the assistance of this novel Navigation System, constant visualization of the drilling trajectory and exact control of the drilling direction can be achieved, which could minimize the risk of penetration into critical anatomical structures. Moreover, implants might be accurately placed in accordance to the preoperative planned position. In this patient, who had previously undergone a hemimaxillectomy, three zygomatic implants were placed on the unilateral zygoma, and two conventional implants were placed on the unresected maxilla. Measurement of distributive deviation of implants between preoperative planning and the postoperative result showed the mean linear deviations at the entrance and apical point of the implant were 1.07 ± 0.15 mm (range: 0.9 to 1.1 mm) and 1.20 ± 0.46 mm (range: 0.7 to 1.6 mm), respectively. The mean angle deviation between the axes of the planned and the actual implant was 1.37 ± 0.21 degrees (range: 1.2 to 1.3 degrees). Therefore, this Surgical Navigation System represents a reliable approach to guide the placement of zygomatic implants.
Xiaojun Chen - One of the best experts on this subject based on the ideXlab platform.
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The development of non-contact user interface of a Surgical Navigation System based on multi-LSTM and a phantom experiment for zygomatic implant placement
International Journal of Computer Assisted Radiology and Surgery, 2019Co-Authors: Chunxia Qin, Xingchen Ran, Yiqun Wu, Xiaojun ChenAbstract:PurposeImage-guided Surgical Navigation System (SNS) has proved to be an increasingly important assistance tool for mini-invasive surgery. However, using standard devices such as keyboard and mouse as human–computer interaction (HCI) is a latent vector of infectious medium, causing risks to patients and surgeons. To solve the human–computer interaction problem, we proposed an optimized structure of LSTM based on a depth camera to recognize gestures and applied it to an in-house oral and maxillofacial Surgical Navigation System (Qin et al. in Int J Comput Assist Radiol Surg 14(2):281–289, 2019).MethodsThe proposed optimized structure of LSTM named multi-LSTM allows multiple input layers and takes into account the relationships between inputs. To combine the gesture recognition with the SNS, four left-hand signs waving along four directions were designed to correspond to four operations of the mouse, and the motion of right hand was used to control the movement of the cursor. Finally, a phantom study for zygomatic implant placement was conducted to evaluate the feasibility of multi-LSTM as HCI. Results3D hand trajectories of both wrist and elbow from 10 participants were collected to train the recognition network. Then tenfold cross-validation was performed for judging signs, and the mean accuracy was 96% ± 3%. In the phantom study, four implants were successfully placed, and the average deviations of planned–placed implants were 1.22 mm and 1.70 mm for the entry and end points, respectively, while the angular deviation ranged from 0.4° to 2.9°.ConclusionThe results showed that this non-contact user interface based on multi-LSTM could be used as a promising tool to eliminate the disinfection problem in operation room and alleviate manipulation complexity of Surgical Navigation System.
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The development of non-contact user interface of a Surgical Navigation System based on multi-LSTM and a phantom experiment for zygomatic implant placement
International Journal of Computer Assisted Radiology and Surgery, 2019Co-Authors: Chunxia Qin, Xingchen Ran, Xiaojun ChenAbstract:Image-guided Surgical Navigation System (SNS) has proved to be an increasingly important assistance tool for mini-invasive surgery. However, using standard devices such as keyboard and mouse as human–computer interaction (HCI) is a latent vector of infectious medium, causing risks to patients and surgeons. To solve the human–computer interaction problem, we proposed an optimized structure of LSTM based on a depth camera to recognize gestures and applied it to an in-house oral and maxillofacial Surgical Navigation System (Qin et al. in Int J Comput Assist Radiol Surg 14(2):281–289, 2019). The proposed optimized structure of LSTM named multi-LSTM allows multiple input layers and takes into account the relationships between inputs. To combine the gesture recognition with the SNS, four left-hand signs waving along four directions were designed to correspond to four operations of the mouse, and the motion of right hand was used to control the movement of the cursor. Finally, a phantom study for zygomatic implant placement was conducted to evaluate the feasibility of multi-LSTM as HCI. 3D hand trajectories of both wrist and elbow from 10 participants were collected to train the recognition network. Then tenfold cross-validation was performed for judging signs, and the mean accuracy was 96% ± 3%. In the phantom study, four implants were successfully placed, and the average deviations of planned–placed implants were 1.22 mm and 1.70 mm for the entry and end points, respectively, while the angular deviation ranged from 0.4° to 2.9°. The results showed that this non-contact user interface based on multi-LSTM could be used as a promising tool to eliminate the disinfection problem in operation room and alleviate manipulation complexity of Surgical Navigation System.
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Development of a Surgical Navigation System based on 3D Slicer for intraoperative implant placement surgery
Medical Engineering & Physics, 2017Co-Authors: Xiaojun Chen, Huixiang Wang, Fang Wang, Qiugen Wang, Ron KikinisAbstract:Implant placement has been widely used in various kinds of surgery. However, accurate intraoperative drilling performance is essential to avoid injury to adjacent structures. Although some commercially-available Surgical Navigation Systems have been approved for clinical applications, these Systems are expensive and the source code is not available to researchers. 3D Slicer is a free, open source software platform for the research community of computer-aided surgery. In this study, a loadable module based on Slicer has been developed and validated to support Surgical Navigation. This research module allows reliable calibration of the Surgical drill, point-based registration and surface matching registration, so that the position and orientation of the Surgical drill can be tracked and displayed on the computer screen in real time, aiming at reducing risks. In accuracy verification experiments, the mean target registration error (TRE) for point-based and surface-based registration were 0.31±0.06mm and 1.01±0.06mm respectively, which should meet clinical requirements. Both phantom and cadaver experiments demonstrated the feasibility of our Surgical Navigation software module.
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Development of a Surgical Navigation System based on augmented reality using an optical see-through head-mounted display
Journal of Biomedical Informatics, 2015Co-Authors: Xiaojun Chen, Yiping Wang, Huixiang Wang, Fang Wang, Xiangsen Zeng, Qiugen Wang, Jan EggerAbstract:Display Omitted An Augmented Reality (AR)-based Surgical Navigation System was developed.The real- and virtual-world views are fused in the HMD during the surgery.Some disadvantages of the traditional Surgical Navigation will be overcome.The accuracy was sufficient to meet the clinical requirements. The Surgical Navigation System has experienced tremendous development over the past decades for minimizing the risks and improving the precision of the surgery. Nowadays, Augmented Reality (AR)-based Surgical Navigation is a promising technology for clinical applications. In the AR System, virtual and actual reality are mixed, offering real-time, high-quality visualization of an extensive variety of information to the users (Moussa et al., 2012) 1]. For example, virtual anatomical structures such as soft tissues, blood vessels and nerves can be integrated with the real-world scenario in real time. In this study, an AR-based Surgical Navigation System (AR-SNS) is developed using an optical see-through HMD (head-mounted display), aiming at improving the safety and reliability of the surgery. With the use of this System, including the calibration of instruments, registration, and the calibration of HMD, the 3D virtual critical anatomical structures in the head-mounted display are aligned with the actual structures of patient in real-world scenario during the intra-operative motion tracking process. The accuracy verification experiment demonstrated that the mean distance and angular errors were respectively 0.809?0.05mm and 1.038??0.05?, which was sufficient to meet the clinical requirements.
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Application of a Surgical Navigation System in the rehabilitation of maxillary defects using zygoma implants: report of one case.
The International journal of oral & maxillofacial implants, 2011Co-Authors: Xiaojun Chen, Chengtao WangAbstract:Abstract In the past few decades, the rehabilitation of maxillary defects has posed a significant challenge for prosthodontists. The advent of zygoma implants presents a unique alternative for maxillary reconstruction while minimizing prosthetic complications. However, the placement of zygoma implants is not without risk. This report describes the application of a special self-developed Surgical Navigation System, AccuNavi, for the planning and subsequent precise placement of zygoma implants in patients with maxillectomy defects. The superimposition of the preoperative planning and the real placement demonstrated that all of the three zygoma implants were appropriately positioned and oriented. In the phantom experiment, the mean distance and angular deviations were 0.58 ± 0.18 mm and 1.12 ± 0.39 degrees, respectively. This preliminary use of the AccuNavi for the placment of zygomatic implants appears to be a reliable method for transferring the planning of a complex osteotomy to the actual Surgical procedure. However, further multicenter clinical evaluations should be conducted to establish the predictability of this Surgical technique.
Chengtao Wang - One of the best experts on this subject based on the ideXlab platform.
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Application of a Surgical Navigation System in the rehabilitation of maxillary defects using zygoma implants: report of one case.
The International journal of oral & maxillofacial implants, 2011Co-Authors: Xiaojun Chen, Chengtao WangAbstract:Abstract In the past few decades, the rehabilitation of maxillary defects has posed a significant challenge for prosthodontists. The advent of zygoma implants presents a unique alternative for maxillary reconstruction while minimizing prosthetic complications. However, the placement of zygoma implants is not without risk. This report describes the application of a special self-developed Surgical Navigation System, AccuNavi, for the planning and subsequent precise placement of zygoma implants in patients with maxillectomy defects. The superimposition of the preoperative planning and the real placement demonstrated that all of the three zygoma implants were appropriately positioned and oriented. In the phantom experiment, the mean distance and angular deviations were 0.58 ± 0.18 mm and 1.12 ± 0.39 degrees, respectively. This preliminary use of the AccuNavi for the placment of zygomatic implants appears to be a reliable method for transferring the planning of a complex osteotomy to the actual Surgical procedure. However, further multicenter clinical evaluations should be conducted to establish the predictability of this Surgical technique.
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A Surgical Navigation System for oral and maxillofacial surgery and its application in the treatment of old zygomatic fractures
The International Journal of Medical Robotics and Computer Assisted Surgery, 2010Co-Authors: Xiaojun Chen, Yanping Lin, Chengtao Wang, Guofang Shen, Shilei Zhang, Xudong WangAbstract:Background Nowadays, there is a trend towards computer-aided oral and maxillofacial surgery. However, due to complicated preoperative planning, traditional neurosurgery-orientated Navigation Systems are not suitable and have to be adapted. Methods A Surgical Navigation System is presented for oral and maxillofacial surgery, named AccuNavi, which integrates 3D medical modelling, preoperative Surgical planning and intraoperative tracking. Various algorithms were introduced, for each of which a set of dynamic link libraries (DLLs) were developed using C++, as well as the VTK and ITK, via object-orientated programming methodology, allowing for expandability, accessibility and maintainability in our System. Results The advantage of AccuNavi is validated through clinical applications, especially in a case report about the planning and subsequent precise treatment of old zygomatic fractures. The postoperative 3D-reconstructed CT image demonstrated that the fractured zygoma was fixed in the appropriate position and orientation. Conclusions The clinical application demonstrates tyhe feasibility and reliability of AccuNavi, and it can be extended to various areas in oral and maxillofacial surgery. Copyright © 2010 John Wiley & Sons, Ltd.
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A Surgical Navigation System based on C-arm fluoroscopy images
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi, 2009Co-Authors: Liwei Qian, Shijun Yan, Qing Xia, Chengtao WangAbstract:A Surgical Navigation System based on X-rays of C-arm with a calibration target has been studied and developed. Extracting images of markers in the two templates on the calibration target, the System is able to establish the relationship between different markers coordinates in different coordinate Systems using the algorithm based on the layout of specific markers. The correction of X-ray image distortion and C-arm camera calibration are performed using the images of calibration target as bases. After the parameters of the C-arm projection model being determined, an X-ray image of Surgical site will be acquired preoperatively; the Surgical instruments will be tracked by the optical position System, and then virtual projections of instruments can be formed on preoperative images. Surgeons will perform operations with the guidance of the System. The C-arm can be used less frequently and the X-ray radiation can be reduced. Cadaveric spine specimen experiments and error analysis have underpinned the clinical feasibility of the System.
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Application of a Surgical Navigation System for zygoma implant surgery
IFMBE Proceedings, 2009Co-Authors: Xiaojun Chen, Chengtao WangAbstract:The development of the zygoma implants presents a unique alternative for rehabilitating the severely resorbed maxilla, with only one Surgical procedure and without the need for grafting. However, the placement of zygoma implant is not without risk due to the anatomically complex operation sites. In this paper, an image guided oral implantology System (IGOIS) is presented to transfer the preoperative plan accurately to the operating theatre. With the fabrication of a polymer resin template, a non-invasive point-based registration method is realized, so that all the preoperative determined implant sites can be drilled carefully under the guidance of 2D/3D interactive image rendering environment. The phantom experiment shows that the average distance deviations at the coronal and apical point of the implant are respectively 1.36±0.59 mm and 1.57±0.59 mm, while average angle deviation between the axes of the planned and the actual implant is 4.1°±0.9°.A clinical report of the application of IGOIS for a patient with a severely atrophic maxilla demonstrates that it is an accurate method for transferring the planning of a complex osteotomy to the actual Surgical procedure.
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An improved design of calibration target used in C-arm-based Surgical Navigation System
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi, 2008Co-Authors: Shiju Yan, Liwei Qian, Qing Xia, Tongyi Cheng, Chengtao WangAbstract:Seeing that there are several defects in the calibration target currently used in C-arm-based Surgical Navigation System, we propose an improved design of calibration target based on the theory of generalized mapping. The method of design is introduced, the analysis is made, and the results are reported. The newly designed calibration target is of low manufacturing difficulty and cost; with the new calibration target, the running efficiency and the image quality of the whole Navigation System could be improved. The new calibration target is found to be of several advantages over the currently used ones; it is feasible and is under manufacturing already.
