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Computer Assisted Surgery (Abingdon, England)

Rahul Khare, Branislav Jaramaz, Brian Hamlin, Kenneth L Urish
Unicondylar Knee Arthroplasty (UKA) is a minimally-invasive surgical procedure for treating isolated compartmental knee osteoarthritis. Accurate implant placement is crucial for a successful UKA procedure. Previous work has shown the improvement in UKA by using robotic systems. Here, we present the implant alignment accuracy of a hand-held robotic UKA system compared with a conventional manual UKA system for 12 cadaver specimens. Two surgeons carried out equal number of medial UKAs with robotic UKA on one knee and the manual UKA on the other knee...
December 2018: Computer Assisted Surgery (Abingdon, England)
Tomohisa Nagasao, Tadaaki Morotomi, Motone Kuriyama, Motoki Tamai, Yoshiaki Sakamoto, Naoki Takano
PURPOSE: Detection of optic canal fractures is often difficult because of the subtleness of the fracture. If we could clarify impact on which region around the orbit is likely to accompany the fracture of the optic canal, the knowledge should be useful to make early diagnosis of optic canal fractures. The present study was conducted to elucidate this issue. METHODS: Ten finite element models were produced simulating the skulls of ten humans (8 males and 2 females; 43...
December 2018: Computer Assisted Surgery (Abingdon, England)
Xiaoqing Zhang
Malignant melanoma is one of the most deadly forms of skin cancer, which is one of the world's fastest-growing cancers. Early diagnosis and treatment is critical. In this study, a neural network structure is utilized to construct a broad and accurate basis for the diagnosis of skin cancer, thereby reducing screening errors. The technique is able to improve the efficacy for identification of normally indistinguishable lesions (such as pigment spots) versus clinically unknown lesions, and to ultimately improve the diagnostic accuracy...
December 2017: Computer Assisted Surgery (Abingdon, England)
Roberta Piazza, Sara Condino, Aldo Alberti, Raffaella Nice Berchiolli, Gioachino Coppi, Marco Gesi, Vincenzo Ferrari, Mauro Ferrari
PURPOSE: The in situ fenestration of a standard endograft is currently limited by difficulties in targeting the fenestration site under fluoroscopic control and by the lack of a safe method to perforate the graft. Evidence in the literature suggests the use of a 3 D electromagnetic navigator to accurately guide the endovascular instruments to the target and a laser to selectively perforate the graft. The aim of this work is to provide design guidelines to develop a sensorized catheter to guide the laser tool to the fenestration site and conduct preliminary testing of the feasibility of the proposed solution...
December 2017: Computer Assisted Surgery (Abingdon, England)
Jing Zhao, Xian-Jun Zhou, Cheng-Zhan Zhu, Ying Wu, Bin Wei, Gang Zhang, Xi-Wei Hao, Hong Zhang, Zhong Jiang, Qian Dong
OBJECTIVE: To evaluate the usefulness of Hisense Computer Assisted Surgery System (Hisense CAS) in pre-operative surgical planning and intra-operative navigation for resection of pediatric giant hepatic mesenchymal hamartoma (HMH). METHODS: Five children with HMH underwent hepatectomy in our hospital. Pre-operative abdominal enhanced CT was performed for diagnosis and treatment planning. Using CT DICOM files, three-dimensional reconstruction was performed in three cases for operation planning and intra-operative navigation, with SID carrying out precise liver resection during the operation with Hisense CAS...
December 2017: Computer Assisted Surgery (Abingdon, England)
Fabrizio Cutolo, Antonio Meola, Marina Carbone, Sara Sinceri, Federico Cagnazzo, Ennio Denaro, Nicola Esposito, Mauro Ferrari, Vincenzo Ferrari
PURPOSE: Benefits of minimally invasive neurosurgery mandate the development of ergonomic paradigms for neuronavigation. Augmented Reality (AR) systems can overcome the shortcomings of commercial neuronavigators. The aim of this work is to apply a novel AR system, based on a head-mounted stereoscopic video see-through display, as an aid in complex neurological lesion targeting. Effectiveness was investigated on a newly designed patient-specific head mannequin featuring an anatomically realistic brain phantom with embedded synthetically created tumors and eloquent areas...
December 2017: Computer Assisted Surgery (Abingdon, England)
Changhwan Lee, Yeesuk Kim, Hyung Wook Kim, Young Soo Kim, Jongseong Jang
PURPOSE: The anterior pelvic plane (APP) is commonly used as a reference plane to assess acetabular orientation. However, conventional methods for determining the APP may not be accurate and are prone to user variability. To overcome these issues, we developed a robust method to accurately extract the APP independent of pelvic pose using three-dimensional pelvic computed tomography (CT). MATERIALS AND METHODS: Twenty-eight studies for suspected nonmusculoskeletal conditions were obtained...
December 2017: Computer Assisted Surgery (Abingdon, England)
Hiroshi Kobayashi, Toru Akiyama, Tomotake Okuma, Yusuke Shinoda, Hiroyuki Oka, Nobuaki Ito, Seiji Fukumoto, Sakae Tanaka, Hirotaka Kawano
PURPOSE: Tumor-induced osteomalacia (TIO) is a rare paraneoplastic syndrome usually caused by phosphaturic mesenchymal tumors. Segmental resection has been recommended for these tumors in the bones because curettage was found to be associated with a high local recurrence rate. Navigation-assisted surgery provides radiological information to guide the surgeon during surgery. No previous study has reported on the efficacy of navigation-assisted surgery for tumors in patients with TIO. Therefore, the present study aimed to evaluate the efficacy of navigation-assisted surgery for tumors in patients with TIO...
December 2017: Computer Assisted Surgery (Abingdon, England)
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December 2017: Computer Assisted Surgery (Abingdon, England)
Arun B Mullaji, Gautam M Shetty
BACKGROUND: This prospective study aimed to verify the efficacy of a novel, hand-held, iPod-based navigation system in comparison to traditional navigation system for total knee arthroplasty (TKA). METHODS: Limb alignment, tibial and distal femoral bone cut thickness and plane were recorded intraoperatively using both iPod-based and traditional navigation system in 36 knees undergoing primary TKAs. RESULTS: Intraoperatively, the iPod-based navigation system showed good to excellent correlation and reliability for tibial and distal femoral bone cut thickness, plane of the femoral cut and limb alignment when compared to the traditional navigation system...
December 2017: Computer Assisted Surgery (Abingdon, England)
Justin Chang, Greg Scallon, Mitch Beckert, Jeff Zavala, Matthew Bollier, Brian Wolf, John Albright
BACKGROUND: The accuracy of correction has been shown to be an important determinant in long-term outcomes of patients who were treated with a medial open-wedge high tibial osteotomy (HTO) who suffer from unicompartmental osteoarthritis (OA). Computer navigation systems have the potential to improve surgical precision. The purpose of this study was to compare radiographic outcomes between patients treated with a navigation system and those treated through conventional methods of assessing alignment intra-operatively...
December 2017: Computer Assisted Surgery (Abingdon, England)
Yanli An, Qiusha Tang, Rui Yang, Dongfang Liu, Dongsheng Zhang
PURPOSE: To assess the ability of magnetic albumin nanospheres conjugated with folate (FA-MAN) to provide FR-specific enhancement of C6 glioblastoma on magnetic resonance (MR) images. PROCEDURES: Active targeting effect of magnetic albumin nanospheres conjugated with folate (FA-MAN) was evaluated based on MR images and histopathological analysis. MR imaging of subcutaneously transplanted C6 glioblastomas was performed after intravenous injection of FA-MAN, non-targeted (magnetic albumin nanospheres, MAN) and FA-inhibited (magnetic albumin nanospheres conjugated with folate plus folate, FA-MAN + FA) agents at designated time points...
November 5, 2017: Computer Assisted Surgery (Abingdon, England)
Xinghui Li, Lin Luo, Shidong Zhu, Bibo Yang, Kai Ni, Qian Zhou, Xiaohao Wang
We introduce and investigate a method to identify the feature point of an electrocardiogram (ECG) to provide real-time and accurate trigger signals for pulsatile ventricular assist devices (PVADs). An important part of this method is an improved data processing algorithm, in which a differential calculator and another a low-pass filtering were added to avoid drift in the original signal and systematically delay caused by physical devices. The method was systematically illustrated in this article and a test-setup was built based on the LabVIEW program development environment...
November 3, 2017: Computer Assisted Surgery (Abingdon, England)
Weifeng Liu, Xiaoming Liu, Ruomeng Dai, Xiaoying Tang
EEG-based motor imagery is very useful in brain-computer interface. How to identify the imaging movement is still being researched. Electroencephalography (EEG) microstates reflect the spatial configuration of quasi-stable electrical potential topographies. Different microstates represent different brain functions. In this paper, microstate method was used to process the EEG-based motor imagery to obtain microstate. The single-trial EEG microstate sequences differences between two motor imagery tasks - imagination of left and right hand movement were investigated...
November 3, 2017: Computer Assisted Surgery (Abingdon, England)
Chong Su, Yue Gao, Yuxiao Xie, Yong Xue, Lijun Ge, Hongguang Li
Traditional dysphagia prescreening diagnostic methods require doctors specialists to give patients a total score based on a water swallow test scale. This method is limited by the high dimensionality of the diagnostic elements in the water swallow test scale with heavy workload (Towards each patient, the scale requires the doctors give score for 18 diagnostic elements respectively) as well as the difficulties of extracting and using the diagnostic scale data's non-linear features and hidden expertise information (Even with the scale scores, specific diagnostic conclusions are still given by expert doctors under the expertise)...
November 2, 2017: Computer Assisted Surgery (Abingdon, England)
Yinlong Liu, Zhijian Song, Manning Wang
BACKGROUND: Compared with the traditional point-based registration in the image-guided neurosurgery system, surface-based registration is preferable because it does not use fiducial markers before image scanning and does not require image acquisition dedicated for navigation purposes. However, most existing surface-based registration methods must include a manual step for coarse registration, which increases the registration time and elicits some inconvenience and uncertainty. METHODS: A new automatic surface-based registration method is proposed, which applies 3D surface feature description and matching algorithm to obtain point correspondences for coarse registration and uses the iterative closest point (ICP) algorithm in the last step to obtain an image-to-patient registration...
November 2, 2017: Computer Assisted Surgery (Abingdon, England)
Weichao Liu, Yaqun Kong, Xiafei Shi, Xiaoxi Dong, Hong Wang, Jizhi Zhao, Yingxin Li
BACKGROUND: The diode laser was utilized in soft tissue incision of oral surgery based on the photothermic effect. The contradiction between the ablation efficiency and the thermal damage has always been in diode laser surgery, due to low absorption of its radiation in the near infrared region by biological tissues. Fiber-optic thermal converters (FOTCs) were used to improve efficiency for diode laser surgery. The purpose of this study was to determine the photothermic effect by the temperature and residual laser energy on film FOTCs...
October 31, 2017: Computer Assisted Surgery (Abingdon, England)
Yan Zhang, Diebao Gu, Dafeng Ji
PURPOSE: This paper aimed to explore the design and application of a customized navigation board for lumbar disc ablation. METHODS: Eight cases of lumbar disc herniation (diagnosed by spiral computerized tomography, CT) to be treated via intervertebral ablation using a path from the skin to the herniated intervertebral disc were included. The lumbar vertebrae, sacrum, and skin (adhered to a standard base, Figure 1) were reconstructed based on continuous spiral CT slices...
October 31, 2017: Computer Assisted Surgery (Abingdon, England)
Hua Li, Chuanbo Chen, Shaohong Fang, Shengrong Zhao
Image segmentation plays a crucial role in various biomedical applications. In general, the segmentation of brain Magnetic Resonance (MR) images is mainly used to represent the image with several homogeneous regions instead of pixels for surgical analyzing and planning. This paper proposes a new approach for segmenting MR brain images by using pseudo-color based segmentation with Non-symmetry and Anti-packing Model with Squares (NAMS). First of all, the NAMS model is presented. The model can represent the image with sub-patterns to keep the image content and largely reduce the data redundancy...
October 28, 2017: Computer Assisted Surgery (Abingdon, England)
Xueli Liu, Zhixian Tang, Manning Wang, Zhijian Song
PURPOSE: Mutual information (MI) has been a preferred choice of similarity measure for multi-modal image registration, but the accuracy and robustness of MI are not satisfactory as MI only considers the global intensity correlation while ignoring local and structural information. To address this problem, we combine MI with local and structural information. METHOD: We bring structural information extracted by a modified Accelerated Segment Test (FAST) algorithm into MI...
October 26, 2017: Computer Assisted Surgery (Abingdon, England)
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