An Automatic Registration Method for Radiation-Free Catheter Navigation Guidance

2016 ◽  
Vol 01 (03) ◽  
pp. 1640009 ◽  
Author(s):  
Caspar Gruijthuijsen ◽  
Benoît Rosa ◽  
Phuong Toan Tran ◽  
Jos Vander Sloten ◽  
Emmanuel Vander Poorten ◽  
...  
Keyword(s):  
Tracking System ◽  
User Interaction ◽  
Spatial Awareness ◽  
Registration Method ◽  
Surgical Workflow ◽  
Sensory Data ◽  
Tissue Contrast ◽  
Catheter Navigation ◽  
Harmful Radiation ◽  
The Impact

Catheter navigation is typically based on fluoroscopy. This implies exposure to harmful radiation, lack of depth perception and limited soft-tissue contrast. Catheter navigation would benefit from guidance that makes better use of detailed pre-operatively acquired MR/CT images, while reducing radiation exposure and improving spatial awareness of the catheter pose and shape. A prerequisite for such guidance is an accurate registration between the catheter tracking system and the MR/CT scans. Existing registration methods are lengthy and cumbersome as they require a lot of user interaction. This forms a major obstacle for their adoption into clinical practice. This paper proposes a radiation-free registration method that minimizes the impact on the surgical workflow and avoids most user interaction. The method relies on catheters with embedded sensors that provide intra-operative data that can either belong to the vessel wall or to the lumen of the vessel. Based on the acquired surface and lumen points an accurate registration is computed automatically, with minimal user interaction. Validation of the proposed method is performed on a synthetic yet realistic aorta phantom. Input from electromagnetic tracking, force sensing, and intra-vascular ultrasound are used as intra-operative sensory data.

The impact of tracking system properties on the most likely path estimation in proton CT

2014 ◽  
Vol 59 (23) ◽  
pp. N197-N210 ◽  
Author(s):  
C Bopp ◽  
R Rescigno ◽  
M Rousseau ◽  
D Brasse
Keyword(s):  
Tracking System ◽  
System Properties ◽  
The Impact

Influence of Various Basin Types on Performance of Passive Solar Still: A Review

2021 ◽  
Vol 10 (4) ◽  
pp. 789-802
Author(s):  
Tri Hieu Le ◽  
Minh Tuan Pham ◽  
H Hadiyanto ◽  
Van Viet Pham ◽  
Anh Tuan Hoang
Keyword(s):  
Water Depth ◽  
Thermal Efficiency ◽  
Tracking System ◽  
Design Parameters ◽  
Cylindrical Shape ◽  
Solar Still ◽  
Practical Utilization ◽  
Passive Solar Still ◽  
Passive Solar ◽  
The Impact

Passive solar still is the simplest design for distilling seawater by harnessing solar energy. Although it is undeniable that solar still is a promising device to provide an additional freshwater source for global increasing water demand, low thermal efficiency along with daily distillate yield are its major disadvantages. A conventional solar still can produced 2 to 5 L/m2day. Various studies have been carried out to improve passive solar stills in terms of daily productivity, thermal efficiency, and economic effectiveness. Most of the researches that relate to the daily output improvement of passive solar still concentrates on enhancing evaporation or/and condensation processes. While the condensation process is influenced by wind velocity and characteristics of the condensed surface, the evaporation process is mainly affected by the temperature of basin water. Different parameters affect the brackish water temperature such as solar radiation, design parameters (for example water depth, insulators, basin liner absorptivity, reflectors, sun tracking system, etc). The inclined angle of the top cover is suggested to equal the latitude of the experimental place. Moreover, the decrease of water depth was obtained as a good operational parameter, however, the shallow water depth is required additional feed water for ensuring no dry spot existence. Reflectors and sun-tracking systems help solar still absorb as much solar intensity as possible. The internal reflector can enhance daily yield and efficiency of stepped solar still up to 75% and 56% respectively, whereas, passive solar still with the support of a sun-tracking system improved daily yield up to 22%. Despite large efforts to investigate the impact of the different parameters on passive solar distillation, the effect of the basin liner (including appropriate shapes and type of material), needs to be analyzed for improvement in practical utilization. The present work has reviewed the investigation of the solar still performance with various types of basin liner. The review of solar stills has been conducted critically with rectangular basin, fins basin, corrugated basin, wick type, steps shape, and cylindrical shape basin with variety of top cover shapes. The findings from this work conclude that the basin liner with a cylindrical shape had better performance in comparison with other metal types and provides higher freshwater output. Stepped type, inclined, fin absorber, and corrugated shapes had the efficient performance.  Further exploration revealed that copper is the best-used material for the productivity of passive solar still.

Dynamic vacuum pressure tracking control with high-speed on-off valves

2018 ◽  
Vol 232 (10) ◽  
pp. 1325-1336 ◽  
Author(s):  
Gang Yang ◽  
Kai Chen ◽  
Linglong Du ◽  
Jingmin Du ◽  
Baoren Li
Keyword(s):  
Mass Flow ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Tracking System ◽  
Vacuum Pressure ◽  
Chamber Pressure ◽  
Asymmetric Structure ◽  
The Impact

A vacuum pressure tracking system with high-speed on-off valves is a discontinuous system due to the discrete nature of high-speed on-off valves. Chamber pressure changes in the system are determined by the mass flow rates during the processes of charging and discharging. Here, a sliding mode controller with an asymmetric compensator based on average mass flow rate is designed for accurate vacuum pressure tracking. The controller output signal is converted into the duty cycles of the high-speed on-off valves via a pulse width modulation pulsing scheme. Owing to the extreme asymmetry of the processes, an asymmetric structure comprising one high-speed on-off valve in the charging unit and three high-speed on-off valves in the discharging unit is applied to weaken the impact of asymmetry. In addition, an asymmetric compensator is also designed to modify the pulse width modulation pulsing scheme to further eliminate the asymmetry. Experimental results indicate that the proposed controller achieves better performance in pressure tracking with the asymmetric compensator overcoming process asymmetry and enhancing system robustness.

TeCHO+ program in Gujarat: a protocol for health technology assessment

2020 ◽  
Vol 6 (4) ◽  
pp. 209-214
Author(s):  
Somen Saha ◽  
Priya Kotwani ◽  
Apurvakumar Pandya ◽  
Deepak Saxena ◽  
Tapasvi Puwar ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Health Technology Assessment ◽  
Community Health ◽  
Technology Assessment ◽  
Tracking System ◽  
Newborn Care ◽  
Health Technology ◽  
The State ◽  
Family Welfare ◽  
The Impact

The Health and Family Welfare Department, Government of Gujarat, is implementing a program named Technology for Community Health Operation or TeCHO+ addressing state’s priority health issues. This program envisages replacing the existing mother and child tracking system or e-Mamta application in the state. This program is based on ImTeCHO—Innovative Mobile Technology for Community Health Operations—which was piloted in Jhagadia, Bharuch district of Gujarat in 2013. The program showed improvements not only in terms of coverage of maternal and newborn care packages averting malnutrition but also was cost-effective. This paper details the protocol for health technology assessment to assess the impact of TeCHO+ program on data quality, improvement in service delivery coverage, reduction in morbidity and mortality as well as assess the cost-effectiveness. The study will be conducted in five districts of the state. A mixed-method approach will be adopted. Data will be validated in a phased manner over a period of 3 years along with an assessment of key outcome indicators. Additionally, key informant interviews will be conducted and cost data will be gathered to perform cost-effectiveness analysis. The study will inform policymakers about the impact of TeCHO+ program on quality, access and cost-effectiveness of healthcare services.

Exploring the Behavioral Dimension of Client/Server Technology Implementation

2008 ◽  
pp. 1579-1594
Author(s):  
Eitel J.M. Lauría
Keyword(s):  
Information Technology ◽  
Organizational Behavior ◽  
Technology Implementation ◽  
User Interaction ◽  
End Users ◽  
End User ◽  
Maturity Level ◽  
Implementation Phase ◽  
Client Server ◽  
The Impact

This paper explores the impact of human factor and organizational behavior on the outcome of information technology implementation projects. Client/server technology implementation is used as the leading case, given the fact that it is a good example of a major paradigm shift. The results draw attention to the importance of end-user interaction and the maturity level of organizations as significant factors in the success and benefits of the project. Client/server projects seem to be more successful, are executed in a more timely manner, and yield greater benefits when end users take an active participation in some of the stages, particularly during the implementation phase.

scholarly journals Understanding the Impact of Trunk and Arm Impairments on Wheelchair Rugby Performance During Competition

2019 ◽  
Vol 14 (5) ◽  
pp. 612-619 ◽  
Author(s):  
Barry S. Mason ◽  
Viola C. Altmann ◽  
Victoria L. Goosey-Tolfrey
Keyword(s):  
Performance Measures ◽  
Tracking System ◽  
Technical Skills ◽  
Wheelchair Rugby ◽  
Technical Performance ◽  
Indoor Tracking ◽  
Arm Function ◽  
The Impact ◽  
Technical Measures ◽  
Measures Of Performance

Purpose: To determine the effect of trunk and arm impairments on physical and technical performance during wheelchair rugby (WR) competition. Methods: Thirty-one highly trained WR players grouped according to their trunk (no trunk [NT]; some trunk [T] function) and arm impairments (poor, moderate, and good arm function) participated in 5 WR matches. Players’ physical (wheelchair mobility) and technical (ball handling) activities were analyzed using an indoor tracking system and video analysis, respectively. Results: Trunk impairment explained some of the variance in physical (10.6–23.5%) and technical (16.2–33.0%) performance. T covered more distance, had more possession, scored more goals, and received and made more passes yet spent less time at low speeds and performed fewer inbounds than NT (≤.05). Arm impairment explained some of the variance in all physical (16.7–47.0%) and the majority of technical (13.1–53.3%) performance measures. Moderate and good arm function covered more distance, reached higher peak speeds, spent more time in higher speed zones, scored more goals, had more possession, and received and made more passes, with a higher percentage of 1-handed and long passes, than poor arm function. Good arm function also received more passes and made a higher percentage of 1-handed passes and defensive blocks than moderate arm function (P ≤ .05). Conclusions: Arm impairment affects a greater number of physical and technical measures of performance specific to WR than trunk impairment during competition. Having active finger function (good arm function) yielded no further improvements in physical performance but positively influenced a small number of technical skills.

Is it worth for bachelor graduates to diversify study programme for master level?

2020 ◽  
Vol 34 (9) ◽  
pp. 1387-1401
Author(s):  
Gábor Balogh ◽  
Norbert Sipos
Keyword(s):  
Tracking System ◽  
Research Question ◽  
Administrative Databases ◽  
Content Type ◽  
Major Subject ◽  
Significant Difference ◽  
Professional Profile ◽  
Career Strategies ◽  
Measurement Of Success ◽  
The Impact

PurposeThe purpose of this paper is to add supplement to the theory of human capital with a less researched aspect: diversification possibilities of the professional profile. Our empirical analysis tested the research question, whether there is a significant difference between diversificational and specialist career strategies in the BA-MA transition based on labour market data on salaries and time of getting employment.Design/methodology/approachPresent study analyses data from the Graduate Career Tracking System from 2011 to 2015 and the Integrated Administrative Databases from 2017. Graduates of master's courses were divided and compared in three groups: generalists, specialists and field changers. To evaluate career strategies the measurement of success was based on salaries and the time taken to get jobs.FindingsThe analysis showed that there are visible differences between the results of the three groups regarding factors of employment, so at the time of reaching the absolutorium a lower rate of major subject changers are employed, while field changers get jobs significantly faster. Based on net salaries we could not reveal a difference between major subject retainers and changers, while field changers earn significantly more.Practical implicationsSpecialists (major subject retainers) have jobs that match with their degree and specialty outstandingly, field changers have notably weaker matches, while major subject changers differ only minimally. Considering this it may be due to distorted perception that specialists think the least that their master's studies are essential for the proper execution of their jobs.Originality/valueIn the literature review we found a research gap: Although there is a large number of excellent works analysing the effects of education on wages (salary curve) and career, but only a few of them investigates the impact of the professional portfolio (diversification or specialisation). The novelty of our research is that we developed a new methodology to test this question on example of the Hungarian students of business and economics focused.

How to Synchronize and Register an Optical-Inertial Tracking System

2013 ◽  
Vol 332 ◽  
pp. 130-136
Author(s):  
Ali Soroush ◽  
Mohammad Akbar ◽  
Farzam Farahmand
Keyword(s):  
Time Synchronization ◽  
Tracking System ◽  
Optical Tracking ◽  
Least Mean Square ◽  
Tracking Accuracy ◽  
Optical Tracking System ◽  
Sensory Data ◽  
Spatial Registration ◽  
Using Data ◽  
Error Method

Multi-sensor tracking is widely used for augmentation of tracking accuracy using data fusion. A basic requirement for such applications is the real time temporal synchronization and spatial registration of two sensory data. In this study a new method for time and space coordination of two tracking sensor measurements has been presented. For spatial registration we used a body coordinate system and then applied the effect of the level arm. The time synchronization was done based on least mean square (LMS) error method. This method was implemented to synchronize the position and orientation of an object using Inertial ( IMU) and Optical (Optotrak) tracking systems. The results of synchronized data were validated with measurements of Optical tracking system and the mean error of synchronized Euler angles, were less than 0.28 degree.

Optical and Thermal Simulations of Photovoltaic Modules With and Without Sun Tracking System

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Tahere Zarei ◽  
Morteza Abdolzadeh
Keyword(s):  
Tracking System ◽  
Convection Heat Transfer ◽  
Photovoltaic Modules ◽  
Average Temperature ◽  
Modeling Process ◽  
Pv Module ◽  
Thermal Simulations ◽  
Temperature Errors ◽  
The Impact ◽  
Present Simulation

The experimental method is extensively used to determine the temperature of a photovoltaic (PV) module at different hours of a day. In this method, the module temperature is measured using a temperature sensor mounted on the back of PV module. However, the experimental measurements have high cost and are not applicable everywhere. In this study, an optical–thermal model was used to predict all the PV module layer temperatures in two cases: tilted toward the south and fixed on a two-axis sun tracker. The impact of accurate consideration of the wind velocity and the ambient temperature on the PV module temperature was the main strength of the present simulation. This was carried out testing several correlations for prediction of convection heat transfer coefficient in the modeling process. The front and back layer temperatures as well as the silicon (Si) layer temperature of PV module were separately determined. To verify the results of the simulation, the temperatures of four PV modules measured in four different locations of the world, namely, China, Germany, Australia, and Brazil, were used. The results showed that the present study predicts the temperature of PV module more accurately compared to the previous studies. It was also shown that the average temperature errors between the measured and the predicted temperatures relative to the maximum module temperature were 2.19%, 2.3%, and 2.85%, for Australia, Brazil, and Germany, respectively.

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