10,721 results match your criteria navigation system


Outcomes of Total Knee Arthroplasty in Patients with Prior Hardware: A Case-Control Study Using Handheld Navigation.

J Knee Surg 2021 Apr 14. Epub 2021 Apr 14.

Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India.

Presence of hardware in juxta-articular location poses challenge during total knee arthroplasty (TKA). When present in distal femur, it precludes the use of an intramedullary femoral jig during TKA often necessitating removal of hardware leading to prolonged surgery, higher risk of complications, and inferior results. We conducted a case-control study to assess the outcome of TKA among patients with post-traumatic arthritis using a handheld navigation system to perform bone cuts allowing retention of hardware in situ. Read More

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Developing a Decision Aid to Facilitate Informed Decision Making About Invasive Mechanical Ventilation and Lung Transplantation Among Adults With Cystic Fibrosis: Usability Testing.

JMIR Hum Factors 2021 Apr 14;8(2):e21270. Epub 2021 Apr 14.

Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Feinstein Institutes for Medical Research, Center for Health Innovations and Outcomes Research, Manhasset, NY, United States.

Background: Cystic fibrosis (CF) is a life-limiting genetic disease that causes chronic lung infections. We developed an internet-based decision aid (DA) to help patients with CF make better informed decisions regarding treatments and advance care planning. We built the DA around two major treatment decisions: whether to have a lung transplant and whether to agree to invasive mechanical ventilation (intubation). Read More

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Intraoperative Computed Tomography in Orthopaedic Trauma Surgery.

Z Orthop Unfall 2021 Apr 13. Epub 2021 Apr 13.

BG Trauma Center at Ruprecht-Karls-Universität Heidelberg, Ludwigshafen, Germany.

Background: When using mobile 3D C-arms, impairments in image quality occur due to artefacts caused by metal implants as well as to the limited field of view. To avoid these restrictions, special computed tomography devices were designed, in order to improve image quality and to meet requirements for intraoperative usage.

Objectives: To analyse practicability and benefits of a mobile intraoperative CT device (Airo, Brainlab, Munich, Germany) on the basis of several parameters that were obtained during a 40-month period. Read More

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Biodegradable polyelectrolyte/magnetite capsules for MR imaging and magnetic targeting of tumors.

Nanotheranostics 2021 2;5(3):362-377. Epub 2021 Apr 2.

Molecular and Preclinical Imaging Centres, Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy.

The tireless research for effective drug delivery approaches is prompted by poor target tissue penetration and limited selectivity against diseased cells. To overcome these issues, various nano- and micro-carriers have been developed so far, but some of them are characterized by slow degradation time, thus hampering repeated drug administrations. The aim of this study was to pursue a selective delivery of magnetic biodegradable polyelectrolyte capsules in a mouse breast cancer model, using an external magnetic field. Read More

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Maximum correntropy delay Kalman filter for SINS/USBL integrated navigation.

ISA Trans 2021 Mar 24. Epub 2021 Mar 24.

Department of Automation, Harbin Engineering University, Harbin 150001, China; Engineering Research Center of Navigation Instruments, Harbin Engineering University, Harbin 150001, China. Electronic address:

Communication delay and non-Gaussian noise are challenging issues for underwater navigation and positioning. This study proposes a filtering algorithm for strapdown inertial navigation system/ultra-short baseline (SINS/USBL) integrated navigation to deal with time-varying delay in underwater acoustic communication and cope with non-Gaussian noise induced by outliers and measurement noises. Considering the influence of platform error angle, the measurement equation of SINS/USBL is derived. Read More

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Transportation as a barrier to colorectal cancer care.

BMC Health Serv Res 2021 Apr 13;21(1):332. Epub 2021 Apr 13.

Department of Population Health Sciences, Duke University School of Medicine, Durham, NC, 27701, USA.

Background: Transportation barriers limit access to cancer care services and contribute to suboptimal clinical outcomes. Our objectives were to describe the frequency of Veterans reporting and the factors associated with transportation barriers to or from colorectal cancer (CRC) care visits.

Methods: Between November 2015 and September 2016, Veterans with incident stage I, II, or III CRC completed a mailed survey to assess perceived barriers to recommended care. Read More

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The accelerometer-based navigation system demonstrated superior radiological outcomes in restoring mechanical alignment and component sagittal positioning in total knee arthroplasty.

BMC Musculoskelet Disord 2021 Apr 13;22(1):351. Epub 2021 Apr 13.

Arthritis Clinic & Research Center, Peking University People's Hospital, Peking University, Beijing, 100044, China.

Background: This study aimed to determine whether the accelerometer-based navigation (ABN) could improve the accuracy of restoring mechanical axis (MA), component positioning, and clinical outcomes compared to conventional (CON) total knee arthroplasty (TKA).

Methods: A total of 301 consecutive patients (ABN: 27, CON: 274) were included. A 1:4 propensity score matching (PSM) was performed between the two groups according to preoperative demographic and clinical parameters. Read More

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Towards quantitative and intuitive percutaneous tumor puncture via augmented virtual reality.

Comput Med Imaging Graph 2021 Mar 31;90:101905. Epub 2021 Mar 31.

Department of Computer Science and Engineering, Chinese University of Hong Kong, Hong Kong SAR, China.

In recent years, the radiofrequency ablation (RFA) therapy has become a widely accepted minimal invasive treatment for liver tumor patients. However, it is challenging for doctors to precisely and efficiently perform the percutaneous tumor punctures under free-breathing conditions. This is because the traditional RFA is based on the 2D CT Image information, the missing spatial and dynamic information is dependent on surgeons' experience. Read More

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Control the Neural Stem Cell Fate with Biohybrid Piezoelectrical Magnetite Micromotors.

Nano Lett 2021 Apr 13. Epub 2021 Apr 13.

School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.

Inducing neural stem cells to differentiate and replace degenerated functional neurons represents the most promising approach for neural degenerative diseases including Parkinson's disease, Alzheimer's disease, etc. While diverse strategies have been proposed in recent years, most of these are hindered due to uncontrollable cell fate and device invasiveness. Here, we report a minimally invasive micromotor platform with biodegradable helical () as the framework and superparamagnetic FeO nanoparticles/piezoelectric BaTiO nanoparticles as the built-in function units. Read More

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Navigation-guided percutaneous pelvic cementoplasty for metastatic bone pain: A case report.

Medicine (Baltimore) 2021 Apr;100(15):e25521

Department of Anesthesiology and Pain Medicine.

Rationale: Percutaneous cementoplasty is a minimally invasive procedure that can provide immediate pain relief and improve range of motion in patients with metastatic bone pain. Conventionally, this procedure is guided by computed tomography (CT). However, to minimize exposure to radiation, we performed percutaneous cementoplasty under the guidance of a navigation system. Read More

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MANual vs. automatIC local activation time annotation for guiding Premature Ventricular Complex ablation procedures (MANIaC-PVC study).

Europace 2021 Apr 13. Epub 2021 Apr 13.

Heart Institute, Teknon Medical Center, C/Vilana, 12, 08022 Barcelona, Spain.

Aims: To assess potential benefits of a local activation time (LAT) automatic acquisition protocol using wavefront annotation plus an ECG pattern matching algorithm [automatic (AUT)-arm] during premature ventricular complex (PVC) ablation procedures.

Methods And Results: Prospective, randomized, controlled, and international multicentre study (NCT03340922). One hundred consecutive patients with indication for PVC ablation were enrolled and randomized to AUT (n = 50) or manual (MAN, n = 50) annotation protocols using the CARTO3 navigation system. Read More

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Shape accuracy of fiber optic sensing for medical devices characterized in bench experiments.

Med Phys 2021 Apr 12. Epub 2021 Apr 12.

In-body Systems group, Philips Research, 5656 AE, Eindhoven, The Netherlands.

Purpose: Fiber Optic RealShape (FORS) is a new technology that visualizes the full three-dimensional shape of medical devices such as catheters and guide wires, using an optical fiber embedded in the device. This three-dimensional shape provides guidance to clinicians during minimally invasive procedures, and enables intuitive navigation. The objective of this paper is to assess the accuracy of the FORS technology, as implemented in the current state-of-the-art Philips FORS system. Read More

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Augmented Reality Navigation for Stereoscopic Laparoscopic Anatomical Hepatectomy of Primary Liver Cancer: Preliminary Experience.

Front Oncol 2021 25;11:663236. Epub 2021 Mar 25.

Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China.

Background: Accurate determination of intrahepatic anatomy remains challenging for laparoscopic anatomical hepatectomy (LAH). Laparoscopic augmented reality navigation (LARN) is expected to facilitate LAH of primary liver cancer (PLC) by identifying the exact location of tumors and vessels. The study was to evaluate the safety and effectiveness of our independently developed LARN system in LAH of PLC. Read More

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A Neural Network Model for Learning 3D Object Representations Through Haptic Exploration.

Front Neurorobot 2021 25;15:639001. Epub 2021 Mar 25.

Department of Computer Science, University of Otago, Dunedin, New Zealand.

Humans initially learn about objects through the sense of touch, in a process called "haptic exploration." In this paper, we present a neural network model of this learning process. The model implements two key assumptions. Read More

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Examining How Health Navigation Affects Mental Health Among Gay, Bisexual, and Other Men Who Have Sex with Men Living with Human Immunodeficiency Virus in Guatemala.

AIDS Patient Care STDS 2021 04;35(4):126-133

Department of Health Behavior, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

Gay, bisexual, and other men who have sex with men (GBMSM) are disproportionately affected by mental health problems and human immunodeficiency virus (HIV). Health navigation has the potential to improve both HIV and mental health outcomes; however, few studies have measured the impact of navigation on mental health among people living with HIV. We analyzed longitudinal data from a sociobehavioral survey and navigation monitoring system with GBMSM living with HIV in Guatemala ( = 346) that participated in a 12-month differentiated care intervention. Read More

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Psychometric evaluation of a patient-reported item bank for healthcare engagement.

Qual Life Res 2021 Apr 9. Epub 2021 Apr 9.

National Center for PTSD, VA Palo Alto Health Care System, Menlo Park, USA.

Purpose: Healthcare engagement is a core measurement target for efforts to improve healthcare systems. This construct is broadly defined as the extent to which healthcare services represent collaborative partnerships with patients. Previous qualitative work operationalized healthcare engagement as generalized self-efficacy in four related subdomains: self-management, collaborative communication, health information use, and healthcare navigation. Read More

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Rethinking GPS navigation: creating cognitive maps through auditory clues.

Sci Rep 2021 Apr 8;11(1):7764. Epub 2021 Apr 8.

Microsoft Research, Redmond, WA, 98052, USA.

GPS navigation is commonplace in everyday life. While it has the capacity to make our lives easier, it is often used to automate functions that were once exclusively performed by our brain. Staying mentally active is key to healthy brain aging. Read More

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[Application of navigation system for dental implant in crossing-over the inferior alveolar nerve: a case report].

Zhonghua Kou Qiang Yi Xue Za Zhi 2021 Apr;56(4):377-379

Department of Oral Implantation, Hospital of Stomatology, Jilin University, Changchun 130021, China.

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Robotic Assistance for minimally invasive cervical pedicle instrumentation: Report on Feasibility and Safety.

World Neurosurg 2021 Apr 5. Epub 2021 Apr 5.

Neurosurgery Department, La Timone university hospital, APHM, Marseille, France; Spine Unit, La Timone university hospital, APHM, Marseille, France.

Background: Accurate screw placement remains very challenging especially in the cervical spine.

Objective: We present our first experience of minimally invasive posterior cervical and upper thoracic pedicle screw fixation in the lower cervical spine.

Methods: This is a case-series of patients, undergoing a posterior percutaneous pedicle fixation using Cirq® Robotic Assistance coupled to the AIRO® intraoperative computed tomography (iCT)-Scan and BrainLab® (Brainlab AG Olof-Palme-Straße 9 81829 Munich Germany) navigation system. Read More

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Visual display for surgical targeting: concepts and usability study.

Int J Comput Assist Radiol Surg 2021 Apr 8. Epub 2021 Apr 8.

Medical University of Innsbruck, Innsbruck, Austria.

Purpose: Interactive image-guided surgery technologies enable accurate target localization while preserving critical nearby structures in many surgical interventions. Current state-of-the-art interfaces largely employ traditional anatomical cross-sectional views or augmented reality environments to present the actual spatial location of the surgical instrument in preoperatively acquired images. This work proposes an alternative, simple, minimalistic visual interface intended to assist during real-time surgical target localization. Read More

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Robust vestibular self-motion signals in macaque posterior cingulate region.

Elife 2021 04 8;10. Epub 2021 Apr 8.

CAS Center for Excellence in Brain Science and Intelligence Technology, Key Laboratory of Primate Neurobiology, Institute of Neuroscience, Chinese Academy of Sciences, Shanghai, China.

Self-motion signals, distributed ubiquitously across parietal-temporal lobes, propagate to limbic hippocampal system for vector-based navigation via hubs including posterior cingulate cortex (PCC) and retrosplenial cortex (RSC). Although numerous studies have indicated posterior cingulate areas are involved in spatial tasks, it is unclear how their neurons represent self-motion signals. Providing translation and rotation stimuli to macaques on a 6-degree-of-freedom motion platform, we discovered robust vestibular responses in PCC. Read More

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3D-Printed Screw-Rod Auxiliary System for Unstable Atlas Fractures: A Retrospective Analysis.

Orthop Surg 2021 Apr 7. Epub 2021 Apr 7.

Orthopaedics Center, Zigong Fourth People's Hospital, Zigong, China.

Objective: To develop and validate the efficacy of a 3D-printed screw-rod auxiliary system for unstable atlas fractures.

Methods: This research is a retrospective analysis, and a total of 14 patients, including 11 males and three females, were enrolled in our hospital from January 2017 to March 2019 who underwent occipitocervical fusion assisted by the 3D-printed screw-rod auxiliary system were reviewed, and with an average age of 53.21 ± 14. Read More

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Outcomes of manual versus remote magnetic navigation for catheter ablation of ventricular tachycardia: a systematic review and updated meta-analysis.

Pacing Clin Electrophysiol 2021 Apr 6. Epub 2021 Apr 6.

Division of Cardiology, Mauriziano Umberto I Hospital, Turin, Italy.

Purpose: Ventricular tachycardia (VT) ablation is a complex procedure that requires remarkable catheter manipulation skill, great mapping accuracy and catheter stability, and can expose patients to serious complications. Magnetic navigation system (RMN)-guided ablation and contact force-sensing (CFS) catheters have the potential to overcome these obstacles. We performed a systematic review and updated meta-analysis of all available studies evaluating the outcomes of VT ablation by using RMN-guided compared to manual navigation (MAN)-guided, with and without CFS catheters. Read More

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Tyrosine hydroxylase immunostaining in the central complex of dicondylian insects.

J Comp Neurol 2021 Apr 6. Epub 2021 Apr 6.

Department of Biology, Animal Physiology, Philipps-Universität Marburg, Marburg, Germany.

Dopamine acts as a neurohormone and neurotransmitter in the insect nervous system and controls a variety of physiological processes. Dopaminergic neurons also innervate the central complex (CX), a multisensory center of the insect brain involved in sky compass navigation, goal-directed locomotion and sleep control. To infer a possible influence of evolutionary history and lifestyle on the neurochemical architecture of the CX, we have studied the distribution of neurons immunoreactive to tyrosine hydroxylase (TH), the rate-limiting enzyme in dopamine biosynthesis. Read More

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Navigation-assisted extraforaminal lumbar disc microdiscectomy: Technical note.

J Craniovertebr Junction Spine 2020 Oct-Dec;11(4):316-320. Epub 2020 Nov 26.

Department of Neurosurgery, Highly Specialized Hospital and of National Importance "Garibaldi", Catania, Italy.

Background: Extraforaminal lumbar disc herniation (ELDH) amounts of 7%-12% of all lumbar disc herniations. Although they have already been widely described, an optimal treatment is still under discussion in the literature.

Objective: We describe a novel application of navigation using 2D/3D imaging system to plan an adequate surgical trajectory and performing a neuronavigated microdiscectomy in ELDH that has not been previously described. Read More

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November 2020

Combined transoral exoscope and OArm-assisted approach for craniovertebral junction surgery: Light and shadows in single-center experience with improving technologies.

J Craniovertebr Junction Spine 2020 Oct-Dec;11(4):293-299. Epub 2020 Nov 26.

Institute of Neurosurgery, Operative Unit, Research Center and Master II Degree Surgical Approaches Craniovertebral Junction, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy.

Background: The introduction of recent innovations in the field of intraoperative imaging and neuronavigation, such as OArm Stealth Station, allows to obtain crucial intraoperative data by performing safer and controlled surgical procedures. As part of the improvement of surgical visual magnification and wide expansion of surgical corridors, the 3D-4K exoscope (EX) represents nowadays an interesting and useful tool. Transoral approach (TOA) represents the historical gold standard direct microsurgical route to ventral craniovertebral junction (CVJ). Read More

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November 2020

Visual Cascade Analytics of Large-scale Spatiotemporal Data.

IEEE Trans Vis Comput Graph 2021 Apr 6;PP. Epub 2021 Apr 6.

Many spatiotemporal events can be viewed as contagions. These events implicitly propagate across space and time by following cascading patterns, expanding their influence, and generating event cascades that involve multiple locations. Analyzing such cascading processes presents valuable implications in various urban applications, such as traffic planning and pollution diagnostics. Read More

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A stellar/inertial integrated navigation method based on the observation of the star centroid prediction error.

Rev Sci Instrum 2021 Mar;92(3):035001

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, Hunan, China.

The stellar/inertial integrated navigation system, which combines the inertial navigation system (INS) and the star tracker, can restrain the accumulated INS errors. In the traditional loosely coupled stellar/inertial integration method, the star tracker needs to observe more than two navigation stars on an image for attitude determination and to use the attitude information as the observation to estimate the systematic errors of the INS. However, under strong background radiation conditions, the star number in the field of view (FOV) usually drops below 3; thus, the loosely coupled method fails to work. Read More

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Wireless 3D Surgical Navigation and Tracking System with 100μm Accuracy Using Magnetic-Field Gradient-Based Localization.

IEEE Trans Med Imaging 2021 Apr 5;PP. Epub 2021 Apr 5.

This paper describes a high-resolution 3D navigation and tracking system using magnetic field gradients, that can replace X-Ray fluoroscopy in high-precision surgeries. Monotonically varying magnetic fields in X, Y and Z directions are created in the field-of-view (FOV) to produce magnetic field gradients, which encode each spatial point uniquely. Highly miniaturized, wireless and battery-less devices, capable of measuring their local magnetic field, are designed to sense the gradient field. Read More

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Hydrographic data inspection and disaster monitoring using shipborne radar small range images with electronic navigation chart.

PeerJ Comput Sci 2020 14;6:e290. Epub 2020 Sep 14.

Maritime College, Guangdong Ocean University, Zhanjiang, Guangdong, China.

Shipborne radars cannot only enable navigation and collision avoidance but also play an important role in the fields of hydrographic data inspection and disaster monitoring. In this paper, target extraction methods for oil films, ships and coastlines from original shipborne radar images are proposed. First, the shipborne radar video images are acquired by a signal acquisition card. Read More

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September 2020