Computer-assisted oral and maxillofacial surgery (OMS) has been rapidly evolving since the last decade. State-of-the-art surgical navigation in OMS still suffers from bulky tracking sensors, troublesome image registration procedures, patient movement, loss of depth perception visual guidance, low accuracy. We present an augmented reality system with automatic marker-free using 3-D overlay stereo for dental surgery. A customized camera is designed to track both instrument. Image performed by...

A variety of medical robots for stereotactic neurosurgery has been developed in recent years. Almost all these use computed tomography (CT) to scan the brain patient before and during surgery. Currently, we are developing a needle insertion manipulator magnetic resonance imaging (MRI)-guided neurosurgery. MRI techniques, including angiography functional MRI, attractive development interventional therapies operations. If robot were available, would be minimally invasive, with more accurate...

Oral and maxillofacial surgery has not been benefitting from image guidance techniques owing to the limitations in registration.A real-time markerless registration method is proposed by integrating a shape matching into 2D tracking framework. The performed patient's teeth model with intraoperative video obtain its pose. resulting pose used overlay relevant models same CT space on camera for augmented reality.The system was evaluated mandible/maxilla phantoms, volunteer clinical data....

Although visual display terminal (VDT) work has become a common task among office workers, surveys which would help to determine the allowable duration of daily VDT use are limited.We investigated more than 25,000 workers three times over 3-year period using self-administered questionnaire. Three factors, namely mental, physical and sleep-related symptoms, were extracted by factor analysis. Adjusted means each score compared with general linear model.Physical symptoms became higher...

Objective: This study investigated the effect of alternating shift work (ASW) on onset diabetes mellitus in Japanese workers compared with day-shift (DSW). Methods: A longitudinal was carried out a DSW group (n = 3203) and ASW 2426) steel company who received their annual health checkups over 10-year period between 1991 2001. The association job schedule type (glycated hemoglobin A1c ≥6.0% or medication) by multivariate pooled logistic regression analyses. Results: odds ratio (95% confidence...

To clarify the effect of shift work on blood pressure in Japanese men, a 14-year historical cohort study was conducted day workers (n=3963) and alternating (n=2748) who received annual health checkups between 1991 2005 steel company. The end points were ≥10%, ≥15%, ≥20%, ≥25%, or ≥30% increase systolic diastolic from baseline during period observation. association an investigated adjusting for age, body mass index, hemoglobin A1c, total serum cholesterol, creatinine, aspartate...

Abstract Background Manual landmarking is a time consuming and highly professional work. Although some algorithm‐based methods have been proposed, they lack flexibility may be susceptible to data diversity. Methods The CT images from 66 patients who underwent oral maxillofacial surgery (OMS) were landmarked manually in MIMICS. Then the slices exported as for recreating 3D volume. coordinate of landmarks further processed Matlab using principal component analysis (PCA) method. A patch‐based...

There have been few large longitudinal studies on the relationship between smoking and blood pressure those results inconsistent. The aim of this study was to clarify influence onset hypertension. A 14-year conducted in Japanese male workers at a steel company 1991 2005. We adopted three different endpoints observation, hypertension [systolic (SBP) >or= 140 mmHg diastolic (DBP) 90 mmHg], systolic (SBP mmHg), (DBP with initiation antihypertensive medication. cohort for each endpoint...

Ultrashort burst laser pulses serve as powerful tools for precise processing, broadband ultrafast spectroscopy, and high-speed laser-scanning microscopy. However, the performance of conventional pulse generators is limited by constraints in time interval variability, energy number overall system complexity. Here, we present a compact generator that offers broad tuning range intervals, along with control over energies within burst. It consists four mirrors, two which are parallel to each...

This paper describes a new type of laparoscopic manipulator system designed with regard to its safety and sterilization in medical settings. It consists laparoscope using five-bar linkage mechanism, an optical zoom called the automatic microzoom laparoscope, man-machine interface Head-Mouse system. The movement X-Y plane determines angle substitutes for back-and-forth movements. achieves intrinsic ease due limitations range movement. high reliability because simplicity both mechanism...

Phase-change nano-droplets (PCNDs) are sub-micron particles that coated with phospholipid and contain liquid-state perfluorocarbons such as perfluoropentane (boiling point=29°C) perfluorohexane point=57°C), which can vapourise upon application of ultrasound. The bubbles generated by reactions serve ultrasound contrast agents or HIFU sensitisers. However, the lifetime from PCNDs on μs-order is not well known. Knowledge condition PCND-derived essential for producing customised specific...

Abstract Background Human‐related factors affect the accuracy and safety of oral maxillofacial surgery (OMS). This study proposed an autonomous surgical system aiming to conduct OMS under assistance surveillance surgeon. Methods A markerless navigation module a compact robot were seamlessly integrated into this system. The specifications each working concept elaborated in paper. drilling experiment was conducted on five 3D‐printed mandible models test pose detecting capability evaluate...

The results of oral and maxillofacial surgery (OMS) significantly depend on the individual capabilities surgeons. In this article, an autonomous surgical robot is proposed to automatically perform according a preoperative plan with assistance surgeon. A 3-D computed tomography image subject's teeth was used build offline shape-based model by creating large amount 2-D contour data. monochrome camera mounted self-developed capture real-time for comparison verify pose without using common...

This study investigated the associations among prevalence of patients with Itai-itai disease, and abnormal urinary findings cadmium (Cd) concentrations in rice individual hamlets Jinzu River basin. From 13,183 participants 1967 1968 health examinations, we selected 3,094 subjects as target population who had resided current hamlet for a total 30 years or longer aged >/=50 years, both Cd concentration disease were known. When inhabitants divided into four groups according to findings,...

Three‐Shift System Increases Job‐Related Stress in Japanese Workers: Hideto Harada, et al. Department of Occupational and Environmental Medicine, Graduate School Chiba University —We assessed the relationship between shift work job stress. The target subjects were 4,962 male workers (3,078 day 1,884 workers) aged 18 to 60 yr who a steel company. We used “Brief Job Questionnaire”, which was developed by research group organized Ministry Labour. evaluated effect on stress using logistic...