abstract：:The aim of this study is to develop a technical quality evaluation system of electroencephalogram (EEG) recording in order to acquire technically satisfactory EEG records, which may contribute to the accuracy improvement of EEG interpretation. In our developed system, the evaluation of EEG recording comprises the dete...

journal_title：Medical engineering & physics

authors： Nakamura M,Chen Q,Sugi T,Ikeda A,Shibasaki H

更新日期：2005-01-01 00:00:00

abstract：:A kinematical model of the lower spine was designed and used to obtain a robust estimation of the vertebral rotations during torso movements from skin-surface markers recorded by video-cameras. Markers were placed in correspondence of the anatomical landmarks of the pelvic bone and vertebral spinous and transverse pro...

journal_title：Medical engineering & physics

authors： Cerveri P,Pedotti A,Ferrigno G

更新日期：2004-12-01 00:00:00

abstract：:On the computational basis of a neurodynamical cortical model, we investigate a specific top-down visual cognitive impairment in brain-damaged patients known as visual spatial neglect. The computational cortical model accounts the neurodynamics underlying selective visual attention, is based on the "biased competition...

journal_title：Medical engineering & physics

authors： Deco G,Zihl J

更新日期：2004-11-01 00:00:00

abstract：:This paper describes a novel three-wire thermal flow sensor for medical applications. The present innovation for low-frequency measurements involves the use of a pulsed-wire anemometer with a comparatively large wire diameter (12.5 microm and larger) together with a novel signal processing approach. A small wire is he...

journal_title：Medical engineering & physics

authors： Al-Salaymeh A,Jovanović J,Durst F

更新日期：2004-10-01 00:00:00

abstract：:We investigated whether automatic control of a hand grasp neuroprosthesis by means of signals from natural sensors in the skin of the index finger can mimic the natural control of grasp force in an important task of daily living, namely eating. We designed a simulated eating task with the same ratio of rest and activi...

journal_title：Medical engineering & physics

authors： Inmann A,Haugland M

更新日期：2004-07-01 00:00:00

abstract：:Terahertz pulsed imaging is a spectroscopic imaging modality using pulses of electromagnetic radiation (100 GHz-10 THz), and there has been recent interest in studying biomedical specimens. It is usual to display parametric images derived from the measured pulses. In this work, classification was achieved by applying ...

journal_title：Medical engineering & physics

authors： Berry E,Handley JW,Fitzgerald AJ,Merchant WJ,Boyle RD,Zinov'ev NN,Miles RE,Chamberlain JM,Smith MA

更新日期：2004-06-01 00:00:00

abstract：:The paper described a limited part of the coagulation pathway, and in particular the inhibitory effects of activated protein C in the context of thrombin production. This is a computational modeling study with various assumption made of kinetic rates laws and their summation. The level of complexity and assumed parame...

journal_title：Medical engineering & physics

authors： Qiao YH,Xu CQ,Zeng YJ,Xu XH,Zhao H,Xu H

更新日期：2004-05-01 00:00:00

abstract：:A ligamentous, nonlinear, sliding contact, three-dimensional finite element (FE) model of L2-L3 complex was developed to investigate the biomechanical effect of laminectomy with and without facetectomy. The L2-L3 FE model was validated against experimental study under various physiological loadings and found to match ...

journal_title：Medical engineering & physics

authors： Lee KK,Teo EC

更新日期：2004-04-01 00:00:00

abstract：:Characterising circulatory dysfunction and choosing a suitable treatment is often difficult and time consuming, and can result in a deterioration in patient condition, or unsuitable therapy choices. A stable minimal model of the human cardiovascular system (CVS) is developed with the ultimate specific aim of assisting...

journal_title：Medical engineering & physics

authors： Smith BW,Chase JG,Nokes RI,Shaw GM,Wake G

更新日期：2004-03-01 00:00:00

abstract：:Segmentation of medical images is very important for clinical research and diagnosis, leading to a requirement for robust automatic methods. This paper reports on the combined use of a neural network (a multilayer perceptron, MLP) and active contour model ('snake') to segment structures in magnetic resonance (MR) imag...

journal_title：Medical engineering & physics

authors： Middleton I,Damper RI

更新日期：2004-01-01 00:00:00

abstract：:Unlike primary stability of coated cementless implants, their secondary stability has been poorly studied. This paper considers some theoretical aspects of the secondary stability of a coated cementless hip implant in a human femur. The bone is separated from the implant by a thin layer of microscopic peaks and trough...

journal_title：Medical engineering & physics

authors： Orlik J,Zhurov A,Middleton J

更新日期：2003-12-01 00:00:00

abstract：:Investigations into the effects of sterilization on a new biomechanical pressure sensor are necessary before contemplating in vivo use. Ten, designated Experimental, "K-Scan" digital pressure sensor arrays were sterilized with ethylene oxide gas (EtO), and their ability to accurately and reproducibly measure an applie...

journal_title：Medical engineering & physics

authors： Agins HJ,Harder VS,Lautenschlager EP,Kudrna JC

更新日期：2003-11-01 00:00:00

abstract：:Middle cerebral arterial blood velocity (MCAv) response to spontaneous and manipulated changes of arterial blood pressure (ABP) was studied in eight subjects using a linear autoregressive with exogenous input (ARX) model. ABP and MCAv were measured non-invasively by photoplethysmograph and transcranial Doppler ultraso...

journal_title：Medical engineering & physics

authors： Liu Y,Birch AA,Allen R

更新日期：2003-10-01 00:00:00

abstract：:The addition of cryopreservative agents (CPAs) to chondrocytes and natural and engineered cartilage is critical to protect the cells and tissues from freezing damage during cryopreservation, but this may cause cell damage, e.g. by osmotic shock. The damage could be minimized by the control of the cell volume excursion...

journal_title：Medical engineering & physics

authors： Xu X,Cui Z,Urban JP

更新日期：2003-09-01 00:00:00

abstract：:In this study, a new ensemble averaging technique was developed to measure cardiac output during treadmill exercise. Each dz/dt peak is used as a starting point for ensemble averaging, instead of the conventionally used R point of ECG, in order to prevent the peak dz/dt waveform (C point) to be smoothed, which results...

journal_title：Medical engineering & physics

authors： Song CG,Kim DW

更新日期：2003-07-01 00:00:00

abstract：:This study describes the method of determination of the position and orientation of artificial knee implants using a single-plane radiograph. To simplify the 3D/2D matching problem, we proposed to use small markers embedded in a bone. From the image coordinates of markers, it is possible to estimate the position and o...

journal_title：Medical engineering & physics

authors： Imai S,Higashijima K,Ishida A,Fukuoka Y,Hoshino A,Minamitani H

更新日期：2003-06-01 00:00:00

abstract：:The objective of this study is to determine the three dimensional kinematics of the human pelvis including both sacroiliac joints following a simulated open book injury induced on cadavers by applying anterior-posterior compressive loads to the pelvis. An electromagnetic digitizing and motion tracking system was utili...

journal_title：Medical engineering & physics

authors： Hefzy MS,Ebraheim N,Mekhail A,Caruntu D,Lin H,Yeasting R

更新日期：2003-05-01 00:00:00

abstract：:The current strategy for the control of tuberculosis (TB) relies on early diagnosis, and smear microscopy is an essential component of the laboratory diagnosis of TB in most countries with a high prevalence of the disease. However, even simple smear microscopy examination is far from satisfactory because staining resu...

journal_title：Medical engineering & physics

authors： Kim SC,Kang SI,Kim DW,Kim SC,Cho SN,Hwang JH,Kim Y,Song SD,Kim YH

更新日期：2003-05-01 00:00:00

abstract：:Functional spinal units (FSUs) are frequently used for in vitro mechanical testing. This approach assumes that the mechanical behavior of the FSUs is equivalent to the mechanics of these segments within the intact spine. The purpose of this study was to determine whether normal spinal mechanics are compromised in FSU ...

journal_title：Medical engineering & physics

authors： Dickey JP,Kerr DJ

更新日期：2003-04-01 00:00:00

abstract：:There are limited interface options for electric powered wheelchairs, which results in the inability of some individuals to drive independently. In addition, the development of new interface technologies will necessitate the development of alternative training methods. This study compares a conventional position sensi...

journal_title：Medical engineering & physics

authors： Cooper RA,Spaeth DM,Jones DK,Boninger ML,Fitzgerald SG,Guo S

更新日期：2002-12-01 00:00:00

abstract：:Radiofrequency has established itself as a useful technique for managing cardiac arrhythmias and treating soft tissue tumors. However, despite its pervasive use, many of the biophysical principals needed to fully understand and optimize the radiofrequency ablation technique have not been explored. We have designed a t...

journal_title：Medical engineering & physics

authors： Chang I,Beard B

更新日期：2002-11-01 00:00:00

abstract：:Electrical impedance 'LX' waveforms measured across the neck at the thyroid level during phonation are known to be correlated with vocal fold movement. Changes in vocal fold contact are thought to be the cause of this phenomenon though emerging applications in radiotherapy indicate that changes in the configuration of...

journal_title：Medical engineering & physics

authors： Moore C,Jones S

更新日期：2002-09-01 00:00:00

abstract：:The presented research positively evaluates the vocality of the cough sound by estimating the global cough fundamental frequency or pitch. The fundamental frequency was determined by autocorrelation analysis on both the original time-signal and the linear predicted time-signal. The experimental cough database was regi...

journal_title：Medical engineering & physics

authors： Van Hirtum A,Berckmans D

更新日期：2002-09-01 00:00:00

abstract：:A system for acoustic analysis of pathological voices is proposed. The vocalized part of the voice signal is separated and all glottal cycles are traced by means of a cross-correlation detector. Based on the so determined beginning and duration of all glottal cycles, shimmer, jitter, several harmonics-to-noise ratios ...

journal_title：Medical engineering & physics

authors： Hadjitodorov S,Mitev P

更新日期：2002-07-01 00:00:00

abstract：:Right ventricle ejection fraction (RVEF) is clinically used to evaluate right ventricular function. The thermodilution method can be modified to estimate the RVEF. However, this method requires a thermistor with a fast time response in order to yield correct estimates. Digital signal processing techniques that were de...

journal_title：Medical engineering & physics

authors： dos Santos I,Ferreira da Rocha A,Assis de O Nascimento F,Souza Neto J,Valvano JW

更新日期：2002-06-01 00:00:00

abstract：:The aim of this study was to develop a technique for analyzing and visualizing the regional, three-dimensional signal intensity distribution of articular cartilage in MR images, as a potential surrogate marker of structural or biochemical alterations in early osteoarthritis. Exemplary MR-images of human patellae were ...

journal_title：Medical engineering & physics

authors： Hohe J,Faber S,Muehlbauer R,Reiser M,Englmeier KH,Eckstein F

更新日期：2002-04-01 00:00:00

abstract：:Fitts' Law was extended in the polar coordinate system, and a set of indices for human motion evaluation is proposed. In this paper, the index of difficulty and the index of performance are introduced as the general indices for the quality measure of plane target-to-target movement. As an example, the target-reaching ...

journal_title：Medical engineering & physics

authors： Yang N,Zhang M,Huang C,Jin D

更新日期：2002-03-01 00:00:00

abstract：:The complexity, nonlinearity and nonstationarity of the cardiovascular system typically defy comprehensive and deterministic mathematical modeling, except from a statistical perspective. Living systems are governed by numerous, continuously changing, interacting variables in the presence of noise. Cardiovascular signa...

journal_title：Medical engineering & physics

authors： Zbilut JP,Thomasson N,Webber CL

更新日期：2002-01-01 00:00:00

abstract：:Individuals often use their wheelchair as a motor vehicle seat when traveling in motor vehicles. The current use of fixed vehicle-mounted wheelchair occupant restraint systems (FWORSs) often results in poor belt fit and discomfort. Additionally, satisfaction, usability and usage rate of FWORSs during transit use are o...

journal_title：Medical engineering & physics

authors： VanRoosmalen L,Bertocci GE,Ha D,Karg P

更新日期：2001-12-01 00:00:00

abstract：:Finite element (FE) models of the proximal femur are often used to study hip fracture. To interpret the results of these models, it is important to know whether the models accurately predict fracture location and/or type. This study evaluated the ability of automatically generated, CT scan-based linear FE models of th...

journal_title：Medical engineering & physics

authors： Keyak JH,Rossi SA,Jones KA,Les CM,Skinner HB

更新日期：2001-11-01 00:00:00

abstract：:The mean value and standard deviation of localization error for the stereo imaging systems are derived based on probability theory. Compared with the maximum error analysis method used in our previous study, the new approach yields more informative and precise results as the guidance for X-ray imaging system design an...

journal_title：Medical engineering & physics

authors： Jiang H,Chen WR,Wang G,Liu H

更新日期：2001-10-01 00:00:00

abstract：:Cervical spinal instability due to ligamentous injury, degenerated disc and facetectomy is a subject of great controversy. There is no analytical investigation reported on the biomechanical response of cervical spine in these respects. Parametric study on the roles of ligaments, facets, and disc nucleus of human lower...

journal_title：Medical engineering & physics

authors： Teo EC,Ng HW

更新日期：2001-04-01 00:00:00

abstract：:Kinematic parameters for 10 normal subjects and 10 patients with ankle arthrodesis are grouped using the fuzzy cluster paradigm. The features chosen for clustering are Euler angles of the sagittal plane in the hindfoot, the forefoot and combined hindfoot and forefoot joints. Gait patterns are identified using informat...

journal_title：Medical engineering & physics

authors： Su F,Wu W,Cheng Y,Chou Y

更新日期：2001-03-01 00:00:00

abstract：:The thermal conductivity of cortical bone was characterized experimentally. Specimens were taken from the mid-diaphysis of bovine femora, and the rate of heat transfer was measured in three orthogonal directions. The conductivity was found to be 0.58+/-0.018 W/mK in the longitudinal direction, 0.53+/-0.030 W/mK in the...

journal_title：Medical engineering & physics

authors： Davidson SR,James DF

更新日期：2000-12-01 00:00:00

abstract：:Failures of proximal femoral nails that treat unstable femoral fractures have been reported. In this communication, a finite element model to include a proximal femoral nail within a fractured femur was used to carry out preliminary investigations into configurations of single or double lag screws. The effects of the ...

journal_title：Medical engineering & physics

authors： Wang CJ,Brown CJ,Yettram AL,Procter P

更新日期：2000-11-01 00:00:00

abstract：:The investigation presented in this paper has attempted to study, from a fluid dynamics point of view, the consequences of the presence of a stent on the flow of blood. The method adopted is mainly by numerical simulation using a finite element technique, but visualization experiments and an analytical study have also...

journal_title：Medical engineering & physics

authors： Natarajan S,Mokhtarzadeh-Dehghan MR

更新日期：2000-10-01 00:00:00

abstract：:The present paper presents a homogenisation technique applied to the problem of calculating equivalent material properties of a resin impregnated wire mesh. Although this type of material can be expected to possess, in general, a four-fold axis of rotational symmetry, it was found that a transversally isotropic model ...

journal_title：Medical engineering & physics

authors： Hübsch PF,Middleton J,Knox J

更新日期：2000-09-01 00:00:00

abstract：:Rapid fluid administration is the cornerstone of successful trauma resuscitation of patients in a state of shock. Intravenous (IV) fluid delivery is a physical intrusion into a vein which results in a complex interaction between the rigid catheter and the compliant vein. We present an experimental model of IV infusion...

journal_title：Medical engineering & physics

authors： Yaniv S,Halpern P,Aladgem D,Zaretsky U,Elad D

更新日期：2000-07-01 00:00:00

abstract：:Precise evaluation of graft reperfusion is difficult in clinical liver transplantation. The oxygen electrode (OE) is a novel technique to detect blood flow indirectly by measuring the quantity of oxygen which can diffuse from the hepatic tissue to the surface electrode. Application of the surface OE does not influence...

journal_title：Medical engineering & physics

authors： Seifalian AM,Mallett S,Piasecki C,Rolles K,Davidson BR

更新日期：2000-06-01 00:00:00

abstract：:We attempted to distinguish walking on level ground from walking on a stairway using waist acceleration signals. A triaxial accelerometer was fixed to the subject's waist and the three acceleration signals were recorded by a portable data logger at a sampling rate of 256 Hz. Twenty healthy male subjects were asked to ...

journal_title：Medical engineering & physics

authors： Sekine M,Tamura T,Togawa T,Fukui Y

更新日期：2000-05-01 00:00:00