abstract：:Based on the principle of backscattering of laser radiation from tissues, a non-invasive PC-AT based reflectance imaging technique is developed. The laser beam from a semiconductor laser operating at 670 nm is guided to the tissue site by an optical fibre. The backscattered radiation is collected by another fibre plac...

journal_title：Medical & biological engineering & computing

authors： Shanthi S,Singh M

更新日期：1997-05-01 00:00:00

abstract：:During dialysis the ion concentrations in many body fluids change significantly. The influence of these changes on the accuracy of volume measurements with bioimpedance spectroscopy is investigated by the following procedure: Plasma ion concentrations and impedance spectra (5-500 kHz) are measured during six standard ...

journal_title：Medical & biological engineering & computing

authors： Scharfetter H,Wirnsberger GH,Holzer H,Hutten H

更新日期：1997-03-01 00:00:00

abstract：:The paper explains the application of a genetic algorithm (GA) to the problem of estimating parameters for a kinetic model of a biologically reacting system. It is demonstrated that the GA is a powerful tool for quantifying the kinetic parameters using kinetic data. As the operation of the GA does not depend on the fo...

journal_title：Medical & biological engineering & computing

authors： Park LJ,Park CH,Park C,Lee T

更新日期：1997-01-01 00:00:00

abstract：:The magnitude, mismatch and temporal variations of the electrode-gel-skin interface impedance can cause problems in electrical impedance tomography (EIT) measurement. It is shown that at the high frequencies generally encountered in EIT the capacitive properties of the electrode interface, and especially those of the ...

journal_title：Medical & biological engineering & computing

authors： McAdams ET,Jossinet J,Lackermeier A,Risacher F

更新日期：1996-11-01 00:00:00

abstract：:Many studies concerning the internal work of human motion have used two-dimensional kinematic models to estimate kinetic energy of the segments. The generalised co-ordinate concept has been applied here to a simultaneous and bilateral gait analysis. A three-dimensional kinematic model based on quaternions has been dev...

journal_title：Medical & biological engineering & computing

authors： Aissaoui R,Allard P,Junqua A,Frossard L,Duhaime M

更新日期：1996-11-01 00:00:00

abstract：:The first in vivo evaluation of a pO2 sensor constructed with a novel copolymer is described. The performance of the sensor is assessed under dynamic conditions in vitro and in vivo. This sensor is more stable and reliable than the control sensor with a heparin-treated polyethylene membrane. ...

journal_title：Medical & biological engineering & computing

authors： Zhang S,Wright G,Kingston MA,Rolfe P

更新日期：1996-07-01 00:00:00

abstract：:Laser Doppler imaging (LDI) is investigated as a novel method for in vivo ligament tissue blood flow determination. LDI output signal is obtained from surgically exposed rabbit medial collateral ligaments (MCL). The LDI signal is compared with simultaneously determined, coloured microsphere (CM)-derived standardised M...

journal_title：Medical & biological engineering & computing

authors： Bray R,Forrester K,McDougall JJ,Damji A,Ferrell WR

更新日期：1996-05-01 00:00:00

abstract：:Sino-aortic denervation (SAD) is employed in cats to evaluate the baroreflex influence on blood pressure (BP) and pulse interval (PI) spectral components from 0.00008 to 0.9 Hz as assessed by FFT wide-band spectra and their 1/f modelling; and the linear coupling between BP and PI and between systolic and diastolic BP ...

journal_title：Medical & biological engineering & computing

authors： Di Rienzo M,Castiglioni P,Parati G,Mancia G,Pedotti A

更新日期：1996-03-01 00:00:00

abstract：:A new algorithm to resolve superimposed motor unit action potentials (MUAPs) is described, which uses a reduced search space and is based on the peel off approach. Knowledge specific to the problem domain, such as temporal relationships between and within motor unit action potential trains and MUAP energy information,...

journal_title：Medical & biological engineering & computing

authors： Etawil H,Stashuk D

更新日期：1996-01-01 00:00:00

abstract：:A computer controlled mechanical lung model has been developed for testing lung function equipment, validation of computer programs and simulation of impaired pulmonary mechanics. The construction, function and some applications are described. The physical model is constructed from two bellows and a pipe system repres...

journal_title：Medical & biological engineering & computing

authors： Verbraak AF,Beneken JE,Bogaard JM,Versprille A

更新日期：1995-11-01 00:00:00

abstract：:A compression algorithm for electrocardiogram signals is presented, based on an auto-associative neural network. Issues of weight and activation coding are considered, and compression performances of various network sizes are compared. A unique feature is the performance improvement achieved using DC level removal. A ...

journal_title：Medical & biological engineering & computing

authors： Hamilton DJ,Thomson DC,Sandham WA

更新日期：1995-11-01 00:00:00

abstract：:OKAS-3D is a further development of the single floating circle target tracker. This tracker consists of a cathode ray tube display, a lens in front of the display and a circular light-sensitive photocell placed in the image field of the lens. A small circular trace generated on the screen is focused around the photoce...

journal_title：Medical & biological engineering & computing

authors： Naeije M,Van der Weijden JJ,Megens CC

更新日期：1995-09-01 00:00:00

abstract：:Instrumentation to measure accurately the stresses at the interface of a residual limb and prosthetic socket has a strong potential for use in prosthetic treatment. As a tool in the clinical setting, the device would allow a clinician to identify sites of excessive loading, information which could then be combined wit...

journal_title：Medical & biological engineering & computing

authors： Sanders JE

更新日期：1995-07-01 00:00:00

abstract：:The role of alveolar macrophages in the process of the human lung clearance is summarised. Three patterns of alveolar macrophage (AM) displacement on the surface of alveolus are distinguished depending on the loading of the surface with insoluble deposits, i.e. directional, directional with small stochastic noise and ...

journal_title：Medical & biological engineering & computing

authors： Gradoń L,Podgórski A

更新日期：1995-07-01 00:00:00

abstract：:The relation is investigated between stimulus frequency, stimulus pulse amplitude and the neural damage induced by continuous stimulation of the cat's sciatic nerve. The chronically implanted electrodes were pulsed continuously and the effects of the electrical stimulation were quantified as the amount of early axonal...

journal_title：Medical & biological engineering & computing

authors： McCreery DB,Agnew WF,Yuen TG,Bullara LA

更新日期：1995-05-01 00:00:00

abstract：:Dynamic methods in the spectral domain are necessary to analyse biological signals because of the frequently nonstationary character of the signals. The paper presents an adaptive procedure of fitting time-dependent ARMA models to nonstationary signals, which is suitable for on-line calculations. The properties of the...

journal_title：Medical & biological engineering & computing

authors： Schack B,Bareshova E,Grieszbach G,Witte H

更新日期：1995-05-01 00:00:00

abstract：:Instantaneous backflow through central clearance of bileaflet heart valves at the instant of closure is investigated. An Edwards-Duromedics valve in the mitral position is employed to measure the transient pressures near the entrance and exit region in an in vitro flow chamber. A region surrounding the clearance is mo...

journal_title：Medical & biological engineering & computing

authors： Lee CS,Chandran KB

更新日期：1995-05-01 00:00:00

abstract：:The recording of sounds over the orbit of the eye has been found to be useful in the detection of intracranial aneurysms. A hydrophone for auscultation over the eye has been developed and is tested under controlled conditions. The tests consist of measurement over the eyes in three healthy volunteers at rest, during v...

journal_title：Medical & biological engineering & computing

authors： Journée HL,van Bruggen AC,van der Meer JJ,de Jonge AB,Mooij JJ

更新日期：1995-03-01 00:00:00

abstract：:The clinical efficacy of a microwave (MW) hyperthermia system using an electric-field converging (lens) applicator is evaluated for 42 malignant tumours with a maximum tumour depth of less than 7 cm. The mean of the maximum, average and minimum tumour temperature of the 42 tumours are 44.5, 42.5 and 40.7 C, respective...

journal_title：Medical & biological engineering & computing

authors： Hiraoka M,Nishimura Y,Masunaga S,Koishi M,Mitsumori M,Li YP,Nagata Y,Akuta K,Takahashi M,Abe M

更新日期：1995-01-01 00:00:00

abstract：:In this paper, the limitations of the conventional formula for the computation of peripheral blood flow from impedance plethysmograms are highlighted, and a correction to the formula is suggested. A conductivity cell experiment is described to show the dependence of the value of the blood flow index (BFI), obtained fr...

journal_title：Medical & biological engineering & computing

authors： Jindal GD,Nerurkar SN,Pednekar SA,Babu JP,Bhuta AC,Deshpande AK

更新日期：1994-11-01 00:00:00

abstract：:Reactive hyperaemia is the term given to the temporary increase in blood flow that follows release of an occlusion of the arterial supply. Measurement of reactive hyperaemia in the leg below the knee is useful in assessment of the vascular system, as resting flows remain unaffected even in the presence of quite severe...

journal_title：Medical & biological engineering & computing

authors： Smye SW,Bloor MI

更新日期：1994-09-01 00:00:00

abstract：:A new system capable of generating static and dynamic random-element stereograms is designed and implemented. The stereogram is composed of a rectangle that can be varied in size, element density, orientation, and horizontal and vertical disparities, and can be swept at several velocities. The system is based on an in...

journal_title：Medical & biological engineering & computing

authors： Gonzalez F,Krause F

更新日期：1994-07-01 00:00:00

abstract：:The mechanical impedance of the ankle joint during electrical stimulation of the soleus is studied by applying constant-velocity 10 degrees angular perturbations to the ankle and measuring the resultant torque. Both neurologically intact subjects and spinal cord injured subjects are tested. Lumped, piecewise linear mo...

journal_title：Medical & biological engineering & computing

authors： Flaherty B,Robinson C,Agarwal G

更新日期：1994-05-01 00:00:00

abstract：:A model which assesses the closed-loop interaction between heart period (HP) and arterial pressure (AP) variabilities and the influence of respiration on both is applied to evaluate the sources of low frequency (LF approximately 0.1 Hz) and high frequency (HF, respiratory rate approximately 0.25 Hz) in conscious dogs ...

journal_title：Medical & biological engineering & computing

authors： Baselli G,Cerutti S,Badilini F,Biancardi L,Porta A,Pagani M,Lombardi F,Rimoldi O,Furlan R,Malliani A

更新日期：1994-03-01 00:00:00

abstract：:The authors have applied estimation theory to the problem of determining primary current distributions from measured neuromagnetic fields. In this procedure, essentially nothing is assumed about the source currents, except that they are spatially restricted to a certain region. Simulation experiments show that the res...

journal_title：Medical & biological engineering & computing

authors： Hämäläinen MS,Ilmoniemi RJ

更新日期：1994-01-01 00:00:00

abstract：:A hydrodynamic model for the part of the human arterial network below the renal arteries has been constructed using specially fabricated distensible tubes and a pulsatile pump to simulate an aortoiliac bypass. The experiments and the computer model indicated that no 'steal' occurred due to the insertion of the bypass ...

journal_title：Medical & biological engineering & computing

authors： Helal MA,Watts KC,Marble AE

更新日期：1993-11-01 00:00:00

abstract：:Time-varying filtering techniques are applied to the problem of baseline correction by letting the cut-off frequency of a linear filter be controlled by the low-frequency properties of the ECG signal. The time-varying filter is implemented as a bank of linear low-pass filters, in which each filter has a slightly diffe...

journal_title：Medical & biological engineering & computing

authors： Sörnmo L

更新日期：1993-09-01 00:00:00

abstract：:A three-element cardiac muscle fibre model, utilising Huxley's sliding filament theory for the contractile element and coupled with parallel and series elastic components, was simulated to see if it were possible to predict the cardiac Fenn effect. The force/length energy (FLE) was computed in both isometric and isoto...

journal_title：Medical & biological engineering & computing

authors： Taylor TW,Goto Y,Suga H

更新日期：1993-07-01 00:00:00

abstract：:Whether Fourier transform infra-red spectroscopy with an attenuated total reflection prism could be applied for noninvasive glucose measurement through oral mucosa was evaluated. As a result, the same absorbance peak at 1033 cm-1 as in glucose aqueous solution was found in the absorbance spectra through mucous membran...

journal_title：Medical & biological engineering & computing

authors： Kajiwara K,Uemura T,Kishikawa H,Nishida K,Hashiguchi Y,Uehara M,Sakakida M,Ichinose K,Shichiri M

更新日期：1993-07-01 00:00:00

abstract：:In recent years, several studies have been focused on the problem of nonthermal interaction between extremely low-frequency (ELF) electromagnetic fields and cell environment at membrane level. In the paper, to analyse the dynamic effects of weak static and harmonic fields on charged particles, some new considerations ...

journal_title：Medical & biological engineering & computing

authors： D'Inzeo G,Galli A,Palombo A

更新日期：1993-07-01 00:00:00

abstract：:To make picture archiving and communication systems (PACS) a practical reality for small-scale structures, it appears necessary to build a network that integrates and optimises production management, analysis and storage of images, and to include the ability to communicate with other similar remote structures. To solv...

journal_title：Medical & biological engineering & computing

authors： Duchêne J,Lerallut JF,Gong N,Kanz R

更新日期：1993-05-01 00:00:00

abstract：:Four ventricular fibrillation (VF) detection techniques were assessed using recordings of VF to evaluate sensitivity and VF-like recordings to evaluate specificity. The recordings were obtained from Coronary Care Unit patients. The techniques were: threshold crossing intervals (TCI); peaks in the autocorrelation funct...

journal_title：Medical & biological engineering & computing

authors： Clayton RH,Murray A,Campbell RW

更新日期：1993-03-01 00:00:00

abstract：:A system, to collect, analyse and display biological data, is developed using IBM PC AT compatibles (PCs) or CED1401/1609 devices networked to a VAX environment. It can be operated in three separate modes: using the CED/IEEE/VAX network; using the PC/Ethernet/VAX network; as a standalone PC. The original system compri...

journal_title：Medical & biological engineering & computing

authors： Marlow SP,Mackenzie DA,Tomlinson JB

更新日期：1993-01-01 00:00:00

abstract：:In three-dimensional reconstruction of the human spine obtained from stereo-radiographic set-ups (two radiographs or more), it is extremely difficult to identify exactly the same landmarks on all radiographs. The effect of these identification errors was investigated with simulations made on points of known three-dime...

journal_title：Medical & biological engineering & computing

authors： André B,Dansereau J,Labelle H

更新日期：1992-11-01 00:00:00

abstract：:The paper deals with the influence of mains interference on time coherent averaging using an internal trigger. The general distribution of the time jitter is derived and applied to a simplified signal. The authors prove that no amount of averaging can do away with this type of interference. Finally, the deformation th...

journal_title：Medical & biological engineering & computing

authors： Strackee J,Peper A

更新日期：1992-09-01 00:00:00

abstract：:This review is a commentary on recent, altered perspectives about biomedical engineering and its role in medicine. It is argued that, rather than being a peripheral specialty, medical engineering and engineering principles in general have a direct application to biochemical medicine and cell biology. A brief descripti...

journal_title：Medical & biological engineering & computing

authors： Vadgama P

更新日期：1992-07-01 00:00:00

abstract：:The changes in the power spectra of single-fibre extracellular action potentials (SFEAPs) generated in an infinite anisotropic frequency-dependent volume conductor, which occurred as a result of alterations in the propagation velocity v and duration T(in) of the intracellular action potential (IAP) were analytically d...

journal_title：Medical & biological engineering & computing

authors： Dimitrov GV,Lateva ZC,Dimitrova NA

更新日期：1992-07-01 00:00:00

abstract：:The paper describes a method of quantifying Duchenne muscular dystrophy which is examiner independent and uses surface electromyographic signals (EMG). A standardised protocol is proposed. Spectral parameters are first computed from digitised EMG, then a polynomial model is deduced from the evolution of each parameter...

journal_title：Medical & biological engineering & computing

authors： Priez A,Duchene J,Goubel F

更新日期：1992-05-01 00:00:00

abstract：:Two ways of rate control for diaphragm pacing are proposed. One is rate control using only the patients' body temperature (method I). The other is rate control by both the patients' heart rate and body temperature (method II). To test the effectiveness of these methods, a diaphragm pacemaker which can be controlled by...

journal_title：Medical & biological engineering & computing

authors： Kimura M,Sugiura T,Fukui Y,Kimura T,Harada Y

更新日期：1992-03-01 00:00:00

abstract：:A personal computer system for electrocardiogram (ECG) ST-segment recognition is developed based on neural networks. The system consists of a preprocessor, neural networks and a recogniser. The adaptive resonance theory (ART) is employed to implement the neural networks in the system, which self-organise in response t...

journal_title：Medical & biological engineering & computing

authors： Suzuki Y,Ono K

更新日期：1992-01-01 00:00:00