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  • 1.
    Almén, Lena
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Design Measures for Construction Site Safety2012In: The Conference of the Nordic Ergonomics Society, 2012Conference paper (Refereed)
    Abstract [en]

    Abstract:Since the 1st of January 2009, all Clients in Sweden are required to appoint a Health and Safety Coordinator for the design and planning phase of their building projects. Telephone interviews were carried out with the Coordinators of 42 building projects during 2010. They were asked to give examples of occupational hazards in the projects and to report how these were handled in the design and planning phase. Trauma risks as well as MSD-risks were identified in the design and planning phase. The hazards were mostly generally described and seldomly taken care of by design changes.

  • 2.
    Almén, Lena
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Larsson, Tore J.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    The Health and Safety Coordinators´Potential to Prevent Injuries on Construction Sites2012In: Working on Safety, 2012Conference paper (Refereed)
    Abstract [en]

    The risk of occupational disease and serious injury in the building and construction industry is high. The earlier in the construction process, the greater are the possibilities to reduce hazards.

    According to the Swedish legislation, Architects and Design Engineers shall, within the framework of their assignment, ensure that aspects of health and safety are considered during the construction of a building as well as in the use of the finished building.

    Since the 1st of January 2009, Clients (natural or legal persons for whom projects are carried out) in Sweden are obliged to appoint a Health and Safety Coordinator for the design and planning of the building. The Coordinators must have the educational skills and experience needed to perform their duties.

    The aim of this study was to find out what persons are appointed to be coordinators, how they perceive their duties and, potentially, what could facilitate the Health and Safety Coordinators’ activities and construction site safety.

    Telephone interviews were carried out with 40 Health and Safety Coordinators for the design and planning phase of 42 building projects during 2010.

    The Coordinators education and experiences varied to a large degree. Their description of duties also varied greatly, from no duties, to administrative duties, to active injury prevention.

    According to the Coordinators, the following factors had a positive influence on their possibilities to act for injury prevention:

    • The Coordinator is appointed early in the process
    • The Coordinator has authority in the project
    • The Client prioritizes occupational safety
    • There is knowledge of construction methods in the design team
  • 3.
    Anthikat-Albert, Benedict D.
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Yiallourou, Theresia I.
    Haba-Rubio, Jose
    Heinzer, Raphael
    Fonari, Eleonora
    Chevrey, Nicolas
    Santini, Francesco
    Stergiopulos, Nikolaos
    Martin, Bryn A.
    Continuous positive airway pressure impacts cerebral blood flow and cerebrospinal fluid motion: A phase contrast mri study2012In: Proceedings Of The ASME 2012 Summer Bioengineering Conference, Parts A and B, ASME Press, 2012, p. 569-570Conference paper (Refereed)
    Abstract [en]

    The physiological impacts of continuous positive airway pressure (CPAP) are not yet fully understood. In this study we developed an MRI protocol to assess the impact of CPAP on cerebral hemodynamics and cerebrospinal fluid (CSF) hydrodynamics in the upper cervical spine. MRI measurements were obtained on 14 healthy male subjects. The preliminary results indicated that the CSF pulsation decreased and venous outflow was altered with CPAP usage in comparison to the baseline values. Cerebral arterial flow was not impacted by CPAP usage. These findings support the hypothesis that the CSF system can act to dampen cerebral blood flow (CBF) pulsations.

  • 4.
    Aronsson, K
    et al.
    Karolinska Institutet.
    Teär Fahnhjelm, K
    Karolinska Institutet.
    Nylén, P
    KTH, School of Technology and Health (STH), Ergonomics.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Visual ergonomics and eye strain in eye careprofessionals2012In: NES2012 Proceedings: Ergonomics for sustainability and growth / [ed] Ann-Beth Antonsson, Göran M Hägg, 2012Conference paper (Other academic)
    Abstract [en]

    Eye care professionals spend many hours a day in darkness performing visually demanding tasks. A new eye hospital will be built in Stockholm 2018. The current lighting, logistics, and working conditions are analysed in a multidisciplinary project aiming to optimise settings in the new hospital. The main purpose of the present project was to study visual ergonomics and current eye strain in employees at an eye hospital. Ninety-six employees answered a validated questionnaire regarding their experiences of light, visual ergonomics and eye strain problems. Twenty-three radiologists and 14 paediatricians at a university hospital were used as comparison groups. Eye strain was common in all departments at the hospital but was significantly more common only among radiologists compared to paediatricians. Overall, women experienced significantly more eye strain than men.

  • 5.
    Atefi, Seyed Reza
    et al.
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701).
    Buendia, Ruben
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701).
    Lindecrantz, Kaj
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701).
    Seoane, Fernando
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701).
    Cole Function and Conductance-Based Parasitic Capacitance Compensation for Cerebral Electrical Bioimpedance Measurements2012In: Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE, San Diego: IEEE press , 2012, p. 3368-3371Conference paper (Refereed)
    Abstract [en]

    One of the most common measurement artifacts present in Electrical Bioimpedance Spectroscopy measurements (EBIS) comes from the capacitive leakage effect resulting from parasitic stray capacitances. This artifact produces a deviation in the measured impedance spectrum that is most noticeable at higher frequencies. The artifact taints the spectroscopy measurement increasing the difficulty of producing reliable EBIS measurements at high frequencies. In this work, an approach for removing such capacitive influence from the spectral measurement is presented making use of a novel method to estimate the value of the parasitic capacitance equivalent that causes the measurement artifact. The proposed method has been tested and validated theoretically and experimentally and it gives a more accurate estimation of the value of the parasitic capacitance than the previous methods. Once a reliable value of parasitic capacitance has been estimated the capacitive influence can be easily compensated in the EBIS measured data. Thus enabling analysis of EBIS data at higher frequencies, i.e. in the range of 300-500 kHz like measurements intended for cerebral monitoring, where the characteristic frequency is remarkably higher than EBIS measurements i.e. within the range 30 to 50 kHz, intended for body composition assessment.

  • 6.
    Atefi, Seyed Reza
    et al.
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Seoane, Fernando
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Lindecrantz, Kaj
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Electrical Bioimpedance cerebral monitoring. Preliminary results from measurements on stroke patients2012In: Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE, IEEE , 2012, p. 126-129Conference paper (Refereed)
    Abstract [en]

    Electrical Bioimpedance Spectroscopy (EBIS) is currently used in different tissue characterization applications. In this work we aim to use EBIS to study changes in electrical properties of the cerebral tissues after an incident of hemorrhage/ischemic stroke. To do so a case-control study was conducted using six controls and three stroke cases. The preliminary results of this study show that by using Cole-based analysis on EBIS measurements and analyzing the Cole parameters R0 and R∞, it is possible to detect changes on electrical properties of cerebral tissue after stroke. 

  • 7.
    Baltoglou, Georgios
    et al.
    KTH, School of Technology and Health (STH).
    Karapistoli, E.
    Chatzimisios, P.
    IPTV QoS and QoE measurements in wired and wireless networks2012In: 2012 IEEE Global Communications Conference (GLOBECOM), IEEE , 2012, p. 1757-1762Conference paper (Refereed)
    Abstract [en]

    Internet Protocol Television or IPTV is a multimedia content delivery service that is increasingly proliferating in the consumers lives and a hot-topic for telecommunication companies to gain a share on consumers' entertainment budget. This alternate method of distributing television content over IP requires a high level of network performance and guaranteed Quality of Service (QoS) in order for the end user to have an assured and high-quality viewing experience. Yet, the quality margins of IPTV are commonly put to test in almost all cases where customers re-distribute the service within their premisses. In this paper, our main motivation is to investigate how such real-life networks perform in terms of distributing this inelastic and high-bandwidth type of service utilizing traffic measurements. Furthermore, our goal is to verify and analyze whether these studied networks are well suited for multicast IPTV traffic.

  • 8.
    Brännmark, Mikael
    et al.
    KTH, School of Technology and Health (STH), Ergonomics.
    Lindskog, Pernilla
    KTH, School of Technology and Health (STH), Ergonomics.
    Halvarsson, Agneta
    Linköpings universitet, HELIX VINN Excellence Centre.
    Patient Quality Effects from Lean Healthcare: An Empirical Investigation2012In: NES2012 Proceedings.: Ergonomics for sustainability and growth / [ed] Ann-Beth Antonsson, Göran Hägg, Stockholm: KTH Royal Institute of Technology, 2012Conference paper (Refereed)
    Abstract [en]

    The use of Lean in healthcare settings has become common in Swedish hospitals. However, the effects from Lean on patients have not been studied extensively. This paper contributes to our understanding of this question, based on 24 semi-structured interviews in three municipal care units and three units in hospitals. The results indicate that there may be a positive link between Lean activities and quality of care. However, it is plausibly a weak link, heavily modulated by non-Lean factors. Thus, we need more empirical research to understand the causal link between patient safety and quality of care from Lean Healthcare.

  • 9. Cecilie, V
    et al.
    Ekstedt, Mirjam
    KTH, School of Technology and Health (STH), Health Systems Engineering.
    Challenges related to the Implementation of an Informatics Intervention into Regular Clinical Practice: A leadership Perspective2012In: 33rd Annual Meeting, Society of Behavioral Medicine, 2012, 2012Conference paper (Refereed)
  • 10.
    Dellve, Lotta
    et al.
    KTH, School of Technology and Health (STH), Ergonomics.
    Wramsten Wilmar, Maria
    KTH, School of Technology and Health (STH).
    Jacobsson, Christian
    Ahlborg, Gunnar jr
    Managers approaches towards media during organizational development processes2012Conference paper (Refereed)
  • 11.
    Ekberg, K
    et al.
    Linköpings Universitet.
    Gustavsson, M
    Linköpings Universitet.
    Lundqvist, D
    Linköpings Universitet.
    Reineholm, C
    Linköpings Universitet.
    Fagerlind, A-C
    Linköpings Universitet.
    Karlsson, N
    Linköpings Universitet.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Leading and organising for health and productivity2012In: Book of Proceedings: Zürich 2012 10th Conference, European Academy of Occupational Health Psychology, 2012Conference paper (Other academic)
  • 12.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Improvements, innovation and Lean2012Conference paper (Other academic)
    Abstract [en]

    Lean has become a dominating change concept in Sweden and in other countries. It has been discussed whether Lean is a support or an obstacle for improvement and innovation. The aim of this paper is to identify examples, opportunities and obstacles for improvement and innovation within the framework of Lean. Cases from 30 organizations have been analyzed. The empirical examples and also literature show that it is possible to work with Lean or Lean principles in a way that arenas of innovation and improvement are created, but that in other organizations this does not happen.

  • 13.
    Eklund, Jörgen
    et al.
    KTH, School of Technology and Health (STH), Ergonomics.
    Svensson, Lennart
    Linköpings Universitet.
    Lean: en möjlighet till effektivitet och innovation2012In: Lean och innovationsförmåga – hinder, möjligheter och kunskapsluckor, 2012, p. 53-59Conference paper (Other academic)
  • 14.
    Ekstedt, Mirjam
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Systems Safety and Management.
    Ödegård, Synnöve
    KTH, School of Technology and Health (STH), Health Systems Engineering, Systems Safety and Management.
    Patients Safety in cancer care from a systems perspective2012In: : The 2nd Nordic Conference in Patient Safety and Healthcare, 2012Conference paper (Refereed)
  • 15.
    Eriksson, Andrea
    et al.
    KTH, School of Technology and Health (STH), Ergonomics (Closed 20130701).
    Williamsson, Anna
    KTH, School of Technology and Health (STH), Ergonomics (Closed 20130701).
    Dellve, Lotta
    KTH, School of Technology and Health (STH), Ergonomics (Closed 20130701).
    Motivations and strategies for why and how to implement the organizational concept lean – a case study of a Swedish hospital2012Conference paper (Refereed)
    Abstract [en]

    The aim of this study was to analyze motivations and strategies of a Swedish hospital for why and how to implement lean. A case study, including interviews with key actors, observations and document analysis, was performed. Lean was in the studied hospital viewed as tools to deal with suggestions from employees on how to improve the delivery of care. Process leaders employed for a limited time were responsible for implementing lean in the different units. The hospitals future choices of implementation strategies, including training of managers, can be seen ascritical for motivating unit-level managers to sustain lean over time.

  • 16.
    Fahlstedt, Madelen
    et al.
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Baeck, Katrien
    Mechanical Engineering Department, Biomechanics Section, Katholieke Universiteit Leuven, Belgium.
    Halldin, Peter
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Vander Sloten, Jos
    Mechanical Engineering Department, Biomechanics Section, Katholieke Universiteit Leuven, Belgium.
    Goffin, Jan
    Mechanical Engineering Department, Biomechanics Section, Katholieke Universiteit Leuven, Belgium.
    Depreitere, Bart
    Mechanical Engineering Department, Biomechanics Section, Katholieke Universiteit Leuven, Belgium.
    Kleiven, Svein
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Influence of impact velocity and angle in a detailed reconstruction of a bicycle accident2012In: 2012 IRCOBI Conference Proceedings - International Research Council on the Biomechanics of Injury, 2012, p. 787-799Conference paper (Refereed)
    Abstract [en]

    Bicycle accidents have become the most common cause of serious injury in the traffic during the last couple of years in Sweden. The objective of this study was to investigate the effect of the input variables, initial velocity and head orientation, of a bicycle accident reconstruction on the strain levels in the brain using a detailed FE head model. The accident involved a non-helmeted 68 year old male who sustained a linear skull fracture, contusions, acute subdural hematoma, and small bleeding at the swelling (subarachnoid blood). The orientation of the head just before impact was determined from the swelling appearing in the computer tomography (CT) scans. The head model used in this study was developed at the Royal Institute of Technology in Stockholm. The stress in the cranial bone, first principal strain in the brain tissue and acceleration were determined. The model was able to predict a strain pattern that correlated well with the medical images from the victim. The variation study showed that the tangential velocity had a large effect on the strain levels in the studied case. The strain pattern indicated larger areas of high strain with increased tangential velocity especially at the more superior sections.

  • 17. Garcia-Molina, G.
    et al.
    Abtahi, Farhad
    KTH, School of Technology and Health (STH), Medical Engineering, Medical sensors, signals and systems.
    Lagares-Lemos, M.
    Automated NREM sleep staging using the Electro-oculogram: A pilot study2012In: Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE, IEEE , 2012, p. 2255-2258Conference paper (Refereed)
    Abstract [en]

    Automatic sleep staging from convenient and unobtrusive sensors has received considerable attention lately because this can enable a large range of potential applications in the clinical and consumer fields. In this paper the focus is on achieving non-REM (NREM) sleep staging from ocular electrodes. From these signals, specific patterns related to sleep such as slow eye movements, K-complexes, eye blinks, and spectral features are estimated. Although such patterns are characteristic of the Electroencephalogram, they can also be visible to a lesser extent on signals from ocular electrodes. Automatic sleep staging was implemented using two approaches: i) based on a state-machine and ii) using a neural network. The first one relied on the recommendations of the American Academy of Sleep Medicine, and the second one used a multilayer perceptron which was trained on manually sleep-staged data. Results were obtained on the data of five volunteers who participated in a nap experiment. Manual sleep staging of this data, performed by an expert, was used as reference. Five stages were considered, namely wake with eyes open, wake with eyes closed, and sleep stages N1, N2, and N3. The results were characterized in terms of confusion matrices from which the Cohen's κ coefficients were estimated. The values of κ for both the state-machine and neural-network based automatic sleep staging approaches were 0.79 and 0.59 respectively. Thus, the state-machine based approach shows a very good agreement with manual staging of sleep-data.

  • 18.
    Glimme, S
    et al.
    Karolinska Institutet.
    Törnquist, A L
    Karolinska Institutet.
    Nylén, Per
    KTH, School of Technology and Health (STH), Ergonomics.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Teär Fahnerhjelm, K
    Karolinska Institutet.
    Lighting and task analysis in an eye hospital.2012Conference paper (Other academic)
    Abstract [en]

    Lighting is crucial in visually demanding activities and essential for a good visual environment. Access to daylight is important for health, wellbeing, production, and patient safety. The purpose of the present project is to design innovative multifunction examination rooms for the planning of a new eye hospital. The specific aims of the current study were to evaluate existing lighting conditions in examination rooms, to identify the tasks undertaken by eye care professionals, and how they relate to lighting. Lighting conditions in three such rooms and task analyses of three ophthalmologists’ work are presented. The mean illumination levels and the equability of illumination were inadequate. Even if there was access to daylight through windows existed, this possibility was rarely used. Task analyses showed that a significant percentage of the time was devoted to examining the patients (44 %), reading and writing or prescribing drops (23%), in medical records. The lighting was adjusted several times between full and dim illumination during contact with patients. There is substantial potential to improve the lighting conditions.

  • 19.
    Glimskär, Bo
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Larsson, Tore J
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Adoption of Ergonomic Innovations in the Construction Industry2012In: Working on Safety, 2012Conference paper (Refereed)
  • 20.
    Grishenkov, Dmitry
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Paradossi, Gaio
    Diapartimento di Chimica, Università di Roma Tor Vergata.
    Assessment of ultrasound-induced fracture of polymer-shelled ultrasound contrast agents using superharmonic technique2012Conference paper (Refereed)
    Abstract [en]

    Ultrasound imaging techniques can be greatly improved by the use of ultrasound contrast agents. Knowledge of the peak negative pressure at which contrast agents fracture is paramount for the imaging application as well as for local drug delivery. Gasholdning microbubbles encapsulated into biocompatible poly vinyl alcohol shells are of particular interest for their enhanced shelf life and demonstratedchemical versatility. A gas core allows microbubbles to efficiently scatter ultrasound waves. In vitro ultrasound tests showed a sufficient enhancement of the backscattered power (25±1 dB), comparable to the soft tissue attenuation coefficients (0.8±0.04 dB/cm MHz) and phase velocities (1519±2 m/s). At temperature values between 24 and 37 °C the monotonic increase of the attenuation and phase velocity with frequency indicates that thick-shelled microbubbles do not resonate in a typical medical ultrasound frequency range of 1-15 MHz. In fact, they work as an amplifier of the incident acoustic wave. The novel approach based on detection of superharmonics (3f and 4f) is proposed for assessment of the fracture pressure threshold, Pthr. In vitro tests suggests that fatigue, i.e. accumulation of damage within the shell, is the major physical mechanism responsible for the fracturing process. It has been observed that there is a decrease of Pthr from 1.15±0.09 MPa to 0.9±0.05 MPa when the number of cycles in the pulse, N, increases from 6 to 12. It is worth noting that the reported pressure values are within clinically approved safety limits. The main conclusion to be drawn from our study is that superharmonic approach appears to be more sensitive in Pthr assessment than traditional second harmonic imaging. This claim is supported also by images acquired with a commercially available system, where contrast pulse sequencing technique, specific to third harmonic, is required for visualization of thick-shelled microbubbles.

  • 21.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Informatics, logistics and management (Closed 20130701).
    Kothapalli, Veeravenkata S
    KTH, School of Technology and Health (STH), Medical Engineering.
    Using Ultrasonic Spectrometry to Estimate the Stability of a Dental Implant Phantom2012Conference paper (Refereed)
  • 22. Hedman, L.
    et al.
    Fahlstedt, Madelen
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Schlickum, M.
    Möller, H.
    Halldin, Peter
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Felländer-Tsai, L.
    Training diagnosis and treatment of cervical spine trauma using a new educational program for visualization through imaging and simulation (VIS): A first evaluation by medical students2012In: Stud. Health Technol. Informatics, 2012, p. 171-174Conference paper (Refereed)
    Abstract [en]

    In this pilot study we investigated how medical students evaluated a VIS practice session. Immediately after training 43 students answered a questionnaire on the training session. They evaluated VIS as a good interactive scenario based educational tool.

  • 23.
    Kothapalli, Veera Venkata Satya Naray
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Grishenkov, Dmitry
    KTH, School of Technology and Health (STH), Medical Engineering.
    Optimization of driving pulse envelopes in detection of harmonic response from lipid-shelled ultrasound contrast agent2012In: 19th International Congress on Sound and Vibration 2012, ICSV 2012: Volume 3, 2012, 2012, p. 1882-1889Conference paper (Refereed)
    Abstract [en]

    The assessment of the harmonic response is commonly used in analysis of the signals from ultrasound contrast agents (UCAs). Theoretical and experimental studies report that acoustic behavior of UCAs strongly depends on insonation pressure. Other system parameters, such as the number of cycles, driving and repetition frequency and the pulse shape are equally important. The major focus of this work is to investigate the effect of the shape of driving pulse envelopes on detection of second- (2f), super- (3f, 4f, 5f), sub- (f/2), and ultra-harmonics (3f/2). In this paper, numerical simulations on thin-shelled lipidic UCA have been performed. The simulation results indicate that, high sidelobe suppression envelopes (e.g. 4-term Blackman-Harris), manage to detect second and third harmonic with harmonic-to-fundamental ratio (HFR) of 32 and 69 dB, respectively, at low acoustic pressure of 5 kPa. However, conventional low sidelobe suppression envelopes (e.g. rectangular, cos-tapered, Hanning, Gaussian) fail to identify the harmonic response. Yet the increase of the insonation pressure to 200 kPa leads to increase of the broadband noise. This negatively effects the frequency resolution when high suppression sidelobe envelopes are applied to the driving pulse. As a result, the application of conventional envelopes in harmonic response detection at intermediate acoustic pressure, is recommended. It is also worth mentioning, that at high isonation pressure of 0.9 MPa, cos-tapered envelope, having a side lobe fall-off equal to 18 dB/octave, is able to identify the sub- and ultra-harmonics. In conclusion our study demonstrates that the driving pulse envelope should be selected according to the incident pressure for the complete exploitation of the unique nonlinear signature from UCA. A compromise could be found with the application of adjustable Kaiser-Bessel envelope where by varying the β parameter from 0 to 10 one goes from low to high sidelobe suppression envelope.

  • 24.
    Larsson, Matilda
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Kremer, F.
    Heyde, B.
    Widman, Erik
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Brodin, Lars-Åke
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    D'Hooge, J.
    Carotid strain estimation using an ultrasound-based speckle tracking algorithm2012In: 2012 IEEE International Ultrasonics Symposium (IUS), IEEE , 2012, p. 1394-1397Conference paper (Refereed)
    Abstract [en]

    Carotid strain imaging using ultrasound-based speckle tracking has showed potential in risk stratification of cardiovascular diseases. However, assessing strain in the artery wall and in atherosclerotic plaques is challenging because of small dimensions and low deformations in relation to the applied ultrasound wavelength. High-resolution ultrasound has potential to improve the speckle tracking performance by increasing spatial resolution. The aim of this study was to compare carotid strain estimation by speckle tracking using standard clinical ultrasound and high-resolution ultrasound in an experimental setup. Ultrasound long-axis images were obtained using a standard clinical ultrasound system (Vivid7) and a high-resolution ultrasound system (Vevo2100) in dynamic phantoms mimicking the carotid artery. Speckle tracking was performed to estimate radial and longitudinal strain whereas sonomicrometry was used as reference. The results showed a significant better performance for speckle tracking applied on images from the high-resolution system compared to the standard clinical system.

  • 25.
    Nilsson, Mats
    et al.
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Ingvast, Johan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Wikander, Jan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    The Soft Extra Muscle System for Improving the Grasping Capability in Neurological Rehabilitation2012In: 2012 IEEE-EMBS Conference on Biomedical Engineering and Sciences, IECBES 2012, New York: IEEE , 2012, p. 412-417Conference paper (Refereed)
    Abstract [en]

    This paper introduces the SEM Glove (Soft Extra Muscle Glove), a comfortable aid which automatically improves the grasping capability of a human independently of the particular task being performed. The technical solution partly mimics a biological solution and at the same time functions in symbiosis with the biological system. The technical invention is also applicable to other parts or regions of the human body that might need supporting forces or torques. A key feature is that a controlling and strengthening effect is achieved without the need for an external mechanical structure in the form of an exoskeleton. The paper includes a description of the physical design, the contents and the system design.

  • 26. Patton, D. A.
    et al.
    McIntosh, A. S.
    Kleiven, Svein
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    The biomechanical determinants of concussion: Kinematic and tissue-level predictors of injury2012In: ASME 2012 Summer Bioengineering Conference, SBC 2012, ASME Press, 2012, p. 507-508Conference paper (Refereed)
  • 27.
    Ren, Wuwei
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Valastyán, Iván
    KTH, School of Technology and Health (STH), Medical Engineering.
    Colarieti-Tosti, Massimiliano
    KTH, School of Technology and Health (STH), Medical Engineering.
    Stationary SPECT with multi-layer multiple-pinhole-arrays2012In: 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), IEEE , 2012, p. 2594-2597Conference paper (Refereed)
    Abstract [en]

    The potential of Multiple Pinhole Arrays (MPA) collimators for developing a Single Photon Emission Computer Tomography (SPECT) system without rotating or moving elements is investigated. A four layer arrangement is proposed and the system performance is evaluated using the simulation toolkit GATE [1]. For a camera with a field of view (FOV) of the order of a human brain (a sphere of radius 100 mm), a sensitivity of 86, 0 cps/MBq and an overall resolution of 5 mm have been estimated, indicating that performances comparable to traditional parallel-hole-collimator cameras can be achieved.

  • 28.
    Seoane, Fernando
    et al.
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Ferreira, Javier
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Buendia, Ruben
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Lindecrantz, Kaj
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Adaptive frequency distribution for Electrical Bioimpedance Spectroscopy measurements2012In: Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE, IEEE , 2012, p. 562-565Conference paper (Refereed)
    Abstract [en]

    This paper presents a novel frequency distribution scheme intended to provide more accurate estimations of Cole parameters. Nowadays a logarithmic frequency distribution is mostly used in Electrical Bioimpedance Spectroscopy (EBIS) applications. However it is not optimized following any criterion. Our hypothesis is that an EBIS signal contains more information where the variation of the measurement regarding the frequency is larger; and that there ought to be more measuring frequencies where there is more information. Results show that for EBIS data with characteristic frequencies up to 200 kHz the error obtained with both frequency distribution schemes is similar. However, for EBIS data with higher values of characteristic frequency the error produced when estimating the values from EBIS measurements using an adaptive frequency distribution is smaller. Thus it may useful for EBIS applications with high values of characteristic frequency, e.g. cerebral bioimpedance.

  • 29.
    Turco, Anna
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Valastyán, Iván
    KTH, School of Technology and Health (STH), Medical Engineering.
    Colarieti-Tosti, Massimiliano
    KTH, School of Technology and Health (STH), Medical Engineering.
    Modular miniPET: A comparison between 10 and 12 detector modules2012In: 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), IEEE , 2012, p. 2598-2602Conference paper (Refereed)
    Abstract [en]

    By means of computer simulations, scatter fraction, spatial resolution and sensitivity of two 10-detector-module small-animal PET (r77-miniPET and r106-miniPET), are analyzed and compared to the performance of the 12-detector-module PET scanner miniPET II [1]. All simulations have been performed with the well validated Geant4 Application for Emission Tomography (GATE) [2]. Sensitivity and scatter fraction speak in favor of the 10-module scanner: a clear improvement in count rate and scatter fraction was found. Moreover, steeper slopes of noise equivalent count rate curves at low levels of activity was found. Spatial resolution instead was found to be better in the 12-module scanner.

  • 30. Ughi, G. J.
    et al.
    Adriaenssens, T.
    Larsson, Matilda
    KTH, School of Technology and Health (STH), Medical Engineering. Katholieke Universiteit Leuven, Belgium.
    Dubois, C.
    Sinnaeve, P.
    Coosemans, M.
    Desmet, W.
    D'Hooghe, J.
    Automatic three-dimensional registration of intra-vascular optical coherence tomography images for the clinical evaluation of stent implantation over time2012In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE, SPIE - International Society for Optical Engineering, 2012, Vol. 8213, p. 82132K-Conference paper (Refereed)
  • 31. Ughi, Giovanni
    et al.
    Adriaenssens, T.
    Larsson, Matilda
    KTH, School of Technology and Health (STH), Medical Engineering.
    Dubois, C.
    Sinnaeve, P.
    Coosemans, M.
    Desmet, W.
    D'hooge, Jan
    Automated three-dimensional registration of intra-vascular optical coherence tomography images for the clinical evaluation of stent implantation over time2012Conference paper (Refereed)
  • 32.
    Valastyán, Iván
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Colarieti-Tostia, Massimiliano
    KTH, School of Technology and Health (STH), Medical Engineering.
    Rena, W.
    Turcoa, A.
    Kereka, A.
    Monte Carlo simulation of a dental Positron Emission Tomograph and image reconstruction of scatter and true coincidence events2012In: 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), IEEE , 2012, p. 3484-3487Conference paper (Refereed)
    Abstract [en]

    Detection of inflammation with nuclear medical imaging techniques [1], especially using PET, has an important role because the location of the disease helps the doctor in the choice of the treatment. In dental applications, the proper treatment of the inflammation might save a tooth.

  • 33.
    Valastyán, Iván
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Gal, J.
    Hegyesi, G.
    Kalinka, G.
    Nagy, F.
    Kiraly, B.
    Imrek, J.
    Molnar, J.
    Colarieti-Tosti, Massimiliano
    KTH, School of Technology and Health (STH), Medical Engineering.
    Szabo, Z.
    Balkay, L.
    Novel time over threshold based readout method for MRI compatible small animal PET detector2012In: 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), IEEE , 2012, p. 1295-1299Conference paper (Refereed)
    Abstract [en]

    Combined PET-MRI scanners start a new era in medical imaging. However the development of MRI compatible PET detector module is a challenging task. SiPM sensors are insensitive to magnetic field and constitute a promising solution. A drawback is the high dark current. A readout concept for SiPM based small animal PET detector module is presented in this paper. The results show that the readout of the SiPM is possible using only four ADC channels and the position map is comparable to the ideal solution. The detector modules based on the method are feasible solution for MRI compatible PET scanners.

  • 34.
    Wibe, Torunn
    et al.
    Oslo Universitet.
    Ekstedt, Mirjam
    KTH, School of Technology and Health (STH).
    Hellesö, Ragnhild
    Oslo Universitet.
    Varsi, Cecilie
    Oslo Universitet Hospital.
    Ruland, Cornelia
    Oslo University Hospital.
    “You Are Not at All Bothersome”: Nurses’ Online Communication withTesticular Cancer Patients2012Conference paper (Refereed)
    Abstract [en]

    To some extent, electronic communication has supplemented nurses’ face-to-face contact with patients over the last few years. In this paper, we report findings from a study in which we examined cancer nurses’ answers to messages from testicular cancer patients in a nurse-managed online patient-provider communication service. The aim of the study was to investigate how nurses manage to meet patients’ different questions and concerns, and what aspects of expert nursing care are demonstrated when they communicate with patients online. The content of the messages formed a continuum from practical to existential issues. In their answers, the nurses demonstrated an ability to make reflected choices between both support modalities and means of communication. The professional knowledge and care of expert cancer nurses were clearly exposed in the nurses’ answers, although they were good at adapting their professional language so that it would be understandable to the patients.

  • 35.
    Widman, Erik
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Maksuti, Elira
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Larsson, Matilda
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Bjällmark, Anna
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Caidahl, K.
    D'Hooge, J.
    Shear wave elastography for characterization of carotid artery plaques-A feasibility study in an experimental setup2012In: 2012 IEEE International Ultrasonics Symposium (IUS), IEEE , 2012, p. 6562400-Conference paper (Refereed)
    Abstract [en]

    Characterization of vulnerable plaques in the carotid artery is critical for the prevention of ischemic stroke. However, ultrasound-based methods for plaque characterization used in the clinics today are limited to visual assessment and evaluation of plaque echogenicity. Shear Wave Elastography (SWE) is a new tissue characterization technique based on radiation force-induced shear wave propagation with potential use in plaque vulnerability assessment. The purpose of this study was to develop an experimental setup to test the feasibility of SWE for carotid plaque characterization. A carotid artery phantom with a soft inclusion in the wall, mimicking a vulnerable plaque, was constructed (10% polyvinyl alcohol (PVA), 3% graphite) by exposing the vessel and plaque to three and one freeze-thaw cycles (6h freeze, 6h thaw) respectively. An Aixplorer SWE system (Supersonic Imagine) was used to measure the shear wave speed (cT) in the vessel wall and plaque. The Young's modulus (E) was then calculated via the Moens-Korteweg (M-K) equation. For comparison, eight cylinders (d = 4 cm, h = 4 cm) were constructed for mechanical testing from the same PVA batch, of which four were exposed to three freeze-thaw cycles (mimicking the vessel wall) and four to one freeze-thaw cycle (mimicking the plaque). The Young's moduli for the cylinders were obtained via a displacement controlled mechanical compression test (Instron 5567) by applying 5% strain. The mean shear wave speed was 2.6 (±0.7) m/s in the vessel wall, 1.8 (±0.7) m/s in the plaque, resulting in Evessel = 11.5 (±0.5) kPa, Eplaque = 4.3 (±0.5) kPa. The compression tests resulted in E = 64.2 (±11.1) kPa in the hard cylinder and E = 9.7 (±3.1) kPa in the soft cylinder. The results showed that it was possible to distinguish between the arterial wall and the plaque. The disagreement between mechanical testing and SWE can be explained by the fact that the shear wave does not propagate monochromatically in cylindrical geometry. To achieve a better calculation of the elastic modulus, the frequency dependency of the shear wave velocity must be considered.

  • 36.
    Wåhslén, Jonas
    et al.
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Orhan, Ibrahim
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Sturm, Dennis
    KTH, School of Technology and Health (STH), Centres, Centre for Technology in Medicine and Health, CTMH.
    Lindh, Thomas
    KTH, School of Technology and Health (STH), Data- och elektroteknik (Closed 20130701).
    Performance evaluation of time synchronization and clock drift compensation in wireless personal area networks2012In: BodyNets '12 Proceedings of the 7th International Conference on Body Area Networks, ICST , 2012, p. 153-158Conference paper (Refereed)
    Abstract [en]

    Efficient algorithms for time synchronization, including compensation for clock drift, are essential in order to obtain reliable fusion of data samples from multiple wireless sensor nodes. This paper evaluates the performance of algorithms based on three different approaches; one that synchronizes the local clocks on the sensor nodes, and a second that uses a single clock on the receiving node (e.g. a mobile phone), and a third that uses broadcast messages. The performances of the synchronization algorithms are evaluated in wireless personal area networks, especially Bluetooth piconets and ZigBee/IEEE 802.15.4 networks. A new approach for compensation of clock drift and a realtime implementation of single node synchronization from the mobile phone are presented and tested. Finally, applications of data fusion and time synchronization are shown in two different use cases; a kayaking sports case, and monitoring of heart and respiration of prematurely born infants. 

  • 37. Zahnd, G.
    et al.
    Larsson, Matilda
    KTH, School of Technology and Health (STH), Medical Engineering.
    Gao, H.
    Serusclat, A.
    Vray, D.
    D'Hooge, J.
    A novel method to generete synthetic ultrasound data of the carotid artery based on in vivo observation as a tool to validate algorithm accuracy2012In: 2012 IEEE International Ultrasonics Symposium (IUS), 2012, p. 1674-1677Conference paper (Refereed)
    Abstract [en]

    Ultrasound imaging represents a well designed modality to estimate the motion of biological tissues in vivo, from which relevant clinical information can be assessed. However, the lack of ground truth constitutes a challenging issue when it comes to evaluate the accuracy of computerized methods. Indeed, quantification of the reliability of experimental results often involves manual or visual human operations, which may introduce subjectivity and variability. Nonetheless, numerical simulation of the imaged tissues allow a comparison with a known reference. For this purpose, we propose in this work a realistic kinematic multi-layer model of the common carotid artery. A set of 10 models was generated by randomly positioning scatterers, on which intensity, specular reflection, and bi-dimensional motion over the duration of one cardiac cycle were applied. Two computerized methods, namely a block-matching method and a segmentation method, were also applied on our model using identical parameter settings as those used for in vivo clinical data, in the objective to assess their accuracy. The tracking errors were 42 ± 40 μm and 12 ± 10 μm in the longitudinal and radial directions, respectively. The segmentation errors were 28±18 μm for the lumen diameter, and 15±10 μm for the intima-media thickness. We conclude from these results that our model can constitute a reliable method to quantify the accuracy of computerized algorithms.

  • 38.
    Öhman, May-Britt
    et al.
    Uppsala universitet, Centrum för Genusvetenskap.
    Thunqvist, Eva-Lotta
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Human Bodies and the Forces of Nature: Regulated Rivers, Safety and Embodied Knowledge2012In: International Commission for Large Dams International Symposium, 2012Conference paper (Refereed)
    Abstract [en]

    This paper discusses the human bodies involved in the regulated rivers, via the technology of design and operation of remote controland surveillance systems. It draws on case studies of hydropower in Sweden, both historical and current events, from studies madewithin an ongoing research project. Within current civil engineering education, training as well as within societal and company leveldecision making on large scale technical systems, the human body, with its knowledges, emotions and affections, as well as itsvulnerabilities are to a large extent disregarded. The body of the engineer/ operator is considered uninteresting and replaceable whileat the same time as it is viewed as a never failing machine. New technologies for camera surveillance and monitoring have providedopportunities to assemble data on a dam and the water flowing through it. We argue that these new technologies may contribute to adecreased dam safety, as it reinforces this paradigm of a detached human body - working like a never failing machine, always in controlof nature’sforces. We suggest that more attention is paid to the human bodies – emotions, affections and societal contexts – workingwith the design and operation of remote control and surveillance systems

1 - 38 of 38
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