Medical Engineering & Physics (MED ENG PHYS)

Publisher: Institute of Physics and Engineering in Medicine (Great Britain), Elsevier

Journal description

Medical Engineering & Physics provides a forum for the publication of the latest developments in biomedical engineering, and reflects the essential multidisciplinary nature of the subject. The journal publishes in-depth critical reviews, scientific papers and communications of work which is at an earlier stage of development. Topics covered include clinical engineering, biomedical computing, biological systems, instrumentation, medical imaging technology, biomaterials, biomechanics and rehabilitation. Medical Engineering & Physics keeps both medical engineers and clinicians abreast of the latest applications of technology to health care.Months of publication: February, March, May, June, August, September, November, December.Index bound in last issue of calendar year.

Current impact factor: 1.83

Impact Factor Rankings

2016 Impact Factor Available summer 2017
2014 / 2015 Impact Factor 1.825
2013 Impact Factor 1.839
2012 Impact Factor 1.779
2011 Impact Factor 1.623
2010 Impact Factor 1.906
2009 Impact Factor 1.674
2008 Impact Factor 2.216
2007 Impact Factor 1.471
2006 Impact Factor 1.179
2005 Impact Factor 1.151
2004 Impact Factor 1.109
2003 Impact Factor 0.949
2002 Impact Factor 0.769
2001 Impact Factor 0.604
2000 Impact Factor 0.497
1999 Impact Factor 0.436
1998 Impact Factor 0.447
1997 Impact Factor 0.486

Impact factor over time

Impact factor
Year

Additional details

5-year impact 2.22
Cited half-life 6.60
Immediacy index 0.27
Eigenfactor 0.01
Article influence 0.63
Website Medical Engineering & Physics website
Other titles Medical engineering & physics (Online), Medical engineering and physics
ISSN 1350-4533
OCLC 39061713
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Elsevier

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Authors pre-print on any website, including arXiv and RePEC
    • Author's post-print on author's personal website immediately
    • Author's post-print on open access repository after an embargo period of between 12 months and 48 months
    • Permitted deposit due to Funding Body, Institutional and Governmental policy or mandate, may be required to comply with embargo periods of 12 months to 48 months
    • Author's post-print may be used to update arXiv and RepEC
    • Publisher's version/PDF cannot be used
    • Must link to publisher version with DOI
    • Author's post-print must be released with a Creative Commons Attribution Non-Commercial No Derivatives License
    • Publisher last reviewed on 03/06/2015
  • Classification
    green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Vertical and horizontal vibrations of a 100 kg seated human body on cushions of various mechanical parameters have been investigated. The vibration inputs were from (a) steering, (b) cushion and (c) a combination of the two. A previously developed model has been used in this study. Resonance frequencies and gains of body segments have been found. The results obtained have been tabulated and presented in graphical manner. It is found that each body segment response depends on the source (steering, cushion or a combination of the two) and the kind (vertical or horizontal) of vibrations as well as the mechanical parameters (mass, stiffness, and damping) of the cushion.
    No preview · Article · Aug 1996 · Medical Engineering & Physics
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    ABSTRACT: Osteoporotic fractures follow a period of asymptomatic bone loss and hence bone strength, predominantly in cancellous bone. An effective management of osteoporosis requires an understanding of the mechanical behaviour of cancellous bone including the anisotropic dependence. Ultrasound velocity (V) and elasticity (Young's modulus, E) were measured in the three orthogonal directions in 20 mm cubes of bovine cancellous bone. Student paired t-test analysis showed significant variations in velocity and elasticity for the three orthogonal directions, the highest significance being between proximal-distal (PD) and antero-posterior (AP) directions with t = 5.63 and 4.09 for velocity and elasticity respectively, the lowest significance between medio-lateral (ML) and antero-posterior directions. Elasticity followed a power law relationship with apparent density (p) as reported in the literature, the exponent (b) being direction dependent (b = 1.98 +/- 0.21 for PD, 2.42 +/- 0.24 for AP and 2.03 +/- 0.17 for ML). The adjusted R2 values between elasticity and apparent density were highly significant (79.9% for PD, 81.9% for AP and 85.7% for ML). The relationship between velocity and apparent density is less significant in terms of the amount of variance explained (48.5% for PD, 63.3% for AP and 64.4% for ML). R2 values relating elasticity and velocity were again highly significant (79.4% for PD, 82.9% for AP and 80.5% for ML) and the coefficients, determined by regression analysis, independent of direction. Analysis of velocity, elasticity and density data for a range of reference materials demonstrated that experimentally measured longitudinal wave velocity could be reliably substituted into the bar wave equation (v = square root E/p). This implies that a combination of velocity and apparent density may be an improved indicator of bone fragility than density alone.
    No preview · Article · Aug 1996 · Medical Engineering & Physics
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    ABSTRACT: An apparatus for simultaneously monitoring heart and respiratory rates was developed using photoplethysmography (PPG) and digital filters, and compared with conventional methods. The PPG signal, which includes both heart and respiratory components, was measured at the earlobe with an original transmission mode photoplethysmographic device. A digital filtering technique was used to distinguish heart and respiratory signals from the PPG signal. The cut-off frequency of the respiratory signal filter was selected automatically depending on the heart rate. Using digital filtering techniques, heart and respiratory signals were separated at rest and during exercise. The digital signal processor was employed to realize an adaptive and real-time filtering. The heart rate was calculated by the zero-crossing method and the respiratory rate from the peak interval of the filtered signal. To evaluate the newly developed monitor, an ECG for heart rate and a transthoracic impedance plethysmogram for respiratory rate were monitored simultaneously. To obtain higher heart and respiratory rates, exercise was performed on an electrical bicycle ergometer. Heart and respiratory rates calculated by the new method compare to those obtained from ECG and the transthoracic impedance plethysmogram. The maximum error of heart and respiratory rates was 10 beats/min and 7 breaths/min, respectively.
    No preview · Article · Aug 1996 · Medical Engineering & Physics
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    ABSTRACT: A model of the lumbar spine, pelvis and buttocks is developed, based on linear horizontal and vertical systems along with a rotational subsystem. The model can mimic qualitatively different experimental observations of transmission of vibrations from the seat to L3 in the sitting posture. It is concluded that while the model lacks detailed sophistication, it adds to our qualitative understanding of the biomechanics of seated vibrations by pointing to those subsystems responsible for the observed transfer functions.
    No preview · Article · Aug 1996 · Medical Engineering & Physics
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    ABSTRACT: This paper discusses some techniques of kinematics analysis, and describes a new system for movement recording and analysis. The new system, which is inexpensive and easy to use, consists mainly of some ultrasonic wave transmitters, receivers, a distributive multiprocessor system and software. The system can record kinematics parameters of anatomical landmarks (e.g. space coordinates, movement trajectories and angles of hips, knees and ankles). Such a system, combined with foot pressure equipment and a force plate, forms an advanced gait analysis system.
    No preview · Article · Aug 1996 · Medical Engineering & Physics
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    ABSTRACT: This article reviews the development of glucose monitoring techniques and approaches during the last decade. The predominance of the electrochemical measuring principles reported in the literature makes them a focus of this work. Biosensors are still in the main stream of the research interest of most teams due to their high selectivity for glucose determination. Systematization and classification of the glucose monitoring principles and types of glucose sensors is shown. The review gives a brief description of the basic operational principles of the most popular types of glucose biosensors, providing an enhanced bibliography of the original works of the main groups in establishing or significantly contributing to the development of the particular type of glucose biosensor. Different design approaches are overviewed including needle-type sensors, sensors for chronical implantation and the combination of the glucose biosensors with microdialysis sampling technique. The authors approach for replacing of the spent enzyme and thus recharging the sensor in situ while implanted is widely discussed. This approach provides a way to increase the lifespan of the system and ultimately, it could lead to rare transcutaneous interventions for refilling of the implanted sensor.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: A portable, lightweight home ankle exerciser was designed and built by the Biomedical Engineering Department of University Hospital in London, Ontario, Canada. The ankle exerciser incorporates several unique features that overcomes the drawbacks of exercise equipment presently available. For optimal muscle strengthening, the resistance offered by the device matches the strength curve of the ankle muscles. The magnitude of the resistance can be widely varied to accommodate any subject. Resistance is generated by a slip clutch rather than by springs or weights which can be cumbersome and potentially dangerous. One of the considerations in the design of the ankle exerciser was to monitor subject compliance with the exercise regimen. This is accomplished with a battery-operated monitoring unit mounted on the device. The exerciser is instrumented with a battery-powered torque transducer and digital display unit that enables the subject and assessor to monitor the exercise resistance level at a glance.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: A new arterial wall permeability function, based on the local wall shear stress gradient, has been developed and employed to simulate enhanced low density lipoprotein transfer across the endothelium. the atherosclerotic model used is that of the aorto-celiac junction of rabbits. The experimentally validated computer simulation model for convection mass transfer provides further evidence that the wall shear stress gradient is a reliable predictor of critical atherogenic sites in branching arteries. Some of the underlying biological aspects of atherogenesis due to locally significant and sustained wall shear stress gradient values are briefly discussed.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: A pulsatile impeller total heart was developed, which consists of two impeller pumps and a d.c. motor. As the motor changes its rotating speed periodically, both pumps eject the blood flow simultaneously. To evaluate its blood compatibility, the device and sarns roller pumps were compared in two series of acute biventricular assist experiments in four and three pigs, respectively. The experimental conditions were controlled to be as equal as possible. The experiments lasted 6 hours. Blood sampling was drawn preoperatively, at the beginning of the pumping and every 2 h postoperatively. Red blood cells (RBC), white blood cells (WBC), platelets (PLT), hematocrit (HCT), hemoglobin (HB), free hemoglobin (FHB) and lactate dehydrogenase (LDH) were measured. The results demonstrated that there was no significant blood damage caused by impeller total heart and the clinically used roller, and that the pulsatile impeller total heart is suitable for chronic animal experiments.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: Although providing an historical overview of the development and clinical applications of conduit-mounted prosthetic heart valves, with elementary explanations of operative techniques, this review concentrates on the impact of design and surgical considerations on their in vivo performance. Areas showing potential for design improvement of mechanical prostheses are highlighted, both in terms of haemodynamic efficiency and haemocompatibility. Comparisons are drawn throughout the paper with conventional valve prostheses, and the key features where they differ significantly are pointed out. It is concluded that there is considerable scope for further worthwhile development.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: This experimental study examines the relative influence of five unilateral external fixators on tibial fracture stability during simulated walking. Stability during routine patient activity is important, because cyclic inter fragmentary motion, or strain, has been shown to affect fracture healing. In model stable fractures simulating early healing (six weeks), it was found that fixators do little to constrain against axial inter fragmentary strains as great as 100% at only nominal weight-bearing (6.0 kg). These strains may occur repeatably at peak amplitudes of motion during walking. Similarly, peak angular movements may lead to additional axial strains of up to 25% at the external cortex and shear movements may lead to shear strains of up to 100%. Such strains are great enough to yield and possibly refracture the intra gap fracture tissue that may be composed of a combination of granulation tissue, fibrous cartilage, cartilage and bone. It was also shown that the procedure of releasing the fixator column to telescope (dynamize) has little influence on peak cyclic axial motion and on loading at the fracture, although increases occurred in peak transverse and torsional shear strains of up to 100%. Since permanent inter fragmentary translation also arises from the consequent compaction of the intra gap tissue, it may be permanent displacement rather than any change in the amplitude of motion that is responsible for the beneficial effect on healing claimed for the dynamizing procedure. In unstable fractures that are unable to support tibial load at the fracture, the peak amplitudes of cyclic movement were as great as those reported for fractures stabilized by plaster casts, and were approximately twice the movement of the stable fractures simulating early healing. Therefore, patients with unstable fractures supported by external fixators, may be expected to have similar patterns of healing to plaster-casted patients with similar fractures.
    Preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: Analysis of three-dimensional velocity profiles and wall shear stress distribution in a segment of an artery reconstructed from in vivo imaging data are presented in this study. Cross-sectional images of a segment of the abdominal aorta in dogs were obtained using intravascular ultrasound (IVUS) imaging employing a constant pull back technique. Simultaneous measurement of pressures distal and proximal to the vessel segment along with gated pulsed Doppler velocity measurements were also obtained. The three-dimensional geometry of the vascular segment was reconstructed from the IVUS images during peak forward flow phase, and a computational mesh was constructed from the data. A quasi-steady analysis of incompressible Newtonian fluid was performed with a finite difference general purpose computational analysis program FLOW3D. The velocity at the inlet and pressure at the outlet measured at the corresponding time (time referenced to ECG) were used to specify the boundary conditions for the computational flow model. The computed results compared favorably with previously reported results. The purpose of the present study was to analyze the hemodynamics in vascular segments from morphologically realistic three-dimensional reconstructions. The method can be potentially employed in analyzing the hemodynamics in the region of atherosclerotic plaques at various stages of development and the reactivity of the vessel in response to pharmacological and mechanical interventions.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: A significant majority of cervical spine biomechanics studies has applied the external loading in the form of compressive force vectors. In contrast, there is a paucity of data on the tensile loading of the neck structure. These data are important as the human neck not only resists compression but also has to withstand distraction due to factors such as the anatomical characteristics and loading asymmetry. Furthermore, evidence exists implicating tensile stresses to be a mechanism of cervical spinal cord injury. Recent advancements in vehicular restraint systems such as air bags may induce tension to the neck in adverse circumstances. Consequently, this study was designed to develop experimental methodologies to determine the biomechanics of the human cervical spinal structures under distractive forces. A part-to-whole approach was used in the study. Four experimental models from 15 unembalmed human cadavers were used to demonstrate the feasibility of the methodology. Structures included isolated cervical spinal cords, intervertebral disc units, skull to T3 preparations, and intact unembalmed human cadavers. Axial tensile forces were applied, and the failure load and distraction were recorded. Stiffness and energy absorbing characteristics were computed. Maximum forces for the spinal cord specimens were the lowest (278 N +/- 90). The forces increased for the intervertebral disc (569 N +/- 54). skull to T3 (1555 N +/- 459), and intact human cadaver (3373 N +/- 464) preparations, indicating the load-carrying capacities when additional components are included to the experimental model. The experimental methodologies outlined in the present study provide a basis for further investigation into the mechanism of injury and the clinical applicability of biomechanical parameters.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: An interactive computer model is described which uses 'blood volume deficit' and 'bleeding duration' together with rates of infusion to simulate the first two hours of haemorrhage. It allows multiple infusions of various fluids to be specified and includes an estimation of the volumes added by the transcapillary refill mechanism. The output is expressed graphically in terms of blood pressure and haematocrit at intervals of one minute. This computer model has proved useful for assessing the effects of a range of variables in hypovolaemic shock. It has considerable potential for investigating the relative efficacy of various clinical protocols and could provide an alternative to animal experimentation which has so far been the primary method of obtaining data on acute haemorrhage. It is also a useful teaching aid.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: Geometric and elastic tapering are significant aspects of the arterial system. Because of tapering, the local compliance of the blood vessels decreases with the distance from the heart, whereas characteristic impedance increases. However, certain discrepancies were observed in the theory explaining the non-uniform geometrical and mechanical properties of proximal arteries in the asymmetric T-tube model, with complex three-element terminal loads. The reliability of the methods and results of tube-characteristic impedance, as obtained from the uniform and the non-uniform T-tube models is questioned.
    No preview · Article · Jul 1996 · Medical Engineering & Physics
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    ABSTRACT: Achieving appropriate integration of control of multiple assistance devices for an individual is currently limited by available integrated systems. An overview of the provision process for Rehabilitation Integrated Systems (RIS) is presented which stresses the need for detailed assessment of the individual's abilities and requirements. A software system is described which integrates existing assistive applications on a PC in an attempt to provide a flexible RIS which can be tailored more precisely to an individual. This has required the use of both DOS and Windows applications and highlighted problems due to limitations of existing RISs, despite user requirements being taken fully into account. While Windows offers the opportunity to remove some compatibility problems, it is concluded that interfacing standards for both software and hardware are necessary to overcome the problems this approach engenders. For individuals who have to use 'intrinsically slow' user interfaces, it is identified that (i) the availability of quantitative comparisons of efficiency of selection methods and (ii) increased choice of selection methods is important.
    No preview · Article · May 1996 · Medical Engineering & Physics