Abstract:
:We present single fibre heart activity model (SFHAM) based on the current flow through the five bunches of fibres of the cardiac muscle (CM). The five effective fibres are identified and assigned to the appropriate segments of CM. Analytical functions describing ionic flows along the fibres are derived and proposed. The parameters determining the shapes and amplitudes of the functions proposed are obtained on the basis of standard 12-lead ECG measurements after numerical fitting procedures concentrating on the QRS-waves. As a consequence, five independent courses of partial, transient potentials are obtained representing: anterior, inferior, lateral, posterior walls, and interventricular septum activities, respectively. Moreover, to check our theoretical results we compare the potentials calculated with those from physical measurements performed on the patient's body surface. We expect that SFHAM will permit detection of pathological changes in particular fragments of CM.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Janicki JS,Leoński W,Jagielski Jdoi
10.1016/j.medengphy.2009.08.007subject
Has Abstractpub_date
2009-12-01 00:00:00pages
1276-82issue
10eissn
1350-4533issn
1873-4030pii
S1350-4533(09)00182-9journal_volume
31pub_type
杂志文章abstract::A decrease in bone density at the hip or spine has been shown to increase the risk of fracture. A limitation of the bone mineral density (BMD) measurement is that it provides only a measure of a bone sample's average density when projected onto a 2D surface. Effectively, what determines bone fracture is whether an app...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2011.08.008
更新日期:2012-05-01 00:00:00
abstract::Taper connections of modular hip prostheses are at risk of fretting and corrosion, which can result in reduced implant survival. The purpose of this study was to identify the minimum torque required to initiate a removal of the passivation layer at the taper interface as a function of assembly force and axial load. Ti...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2014.06.011
更新日期:2014-09-01 00:00:00
abstract::The natural passive flexion axis of human cadaveric knees was determined using a technique that minimized coupled tibiofemoral motions (translations and rotations), and the kinematic effects of mal-positioned flexion axes were determined. The femur was clamped in an apparatus that allowed unconstrained tibial motions ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2019.03.009
更新日期:2019-05-01 00:00:00
abstract::An 'instantaneous' optimal filter is presented for improving the signal-to-noise ratio in averaged electrocardiograms (ECGs). The filter design is based on a simple model that accounts for correlation across the ensemble of beats but ignores correlation in time. Another property of the model is that the noise level is...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/s1350-4533(96)00069-0
更新日期:1997-04-01 00:00:00
abstract::Electromyography (EMG) has been widely used for the assessment of musculoskeletal functions and the control of electrical prostheses, which make use of the EMG signal generated by the contraction of the residual muscles. In spite of the successful applications of EMG in different fields, it has some inherent limitatio...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2005.07.012
更新日期:2006-06-01 00:00:00
abstract::Various simulation models of different complexity have been proposed to model the dynamic response of the human cardiovascular system. In a related paper we proposed an improved numerical model to study the dynamic response of the cardiovascular system, and the pressures, volumes and flow-rates in the four chambers of...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2005.11.005
更新日期:2006-10-01 00:00:00
abstract::Intravascular stents are small tube-like structures expanded into stenotic arteries to restore blood flow perfusion to the downstream tissues. The stent expansion is an important factor to define the effectiveness of the surgical procedure: it depends on the stent geometry and includes large displacements and deformat...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2004.08.012
更新日期:2005-01-01 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
pub_type: 杂志文章
doi:10.1016/s1350-4533(00)00046-1
更新日期:2000-07-01 00:00:00
abstract::The spectral local F-test has been applied for detecting evoked responses to rhythmic stimulation that are embedded in the ongoing electroencephalogram (EEG). Based on the sampling distribution of a flat spectrum at the neighbourhood of the stimulation frequency, spectral peaks in an EEG signal that are due to the sti...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2017.06.032
更新日期:2017-10-01 00:00:00
abstract::In this study, we applied multi-channel mechanomyographic (MMG) recordings in combination with linear and nonlinear analyses to investigate muscular and musculotendinous effects of high intensity eccentric exercise. Twelve accelerometers arranged in a 3 × 4 matrix over the dominant elbow muscles were used to detect MM...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2014.09.003
更新日期:2014-12-01 00:00:00
abstract::A dynamic biomechanical model to determine loads (joint forces) attained at the lumbosacral joint-centre during the stance phase of normal level walking was developed. The biomechanical model was based on rigid free body-segments; namely, the foot, shank, thigh, pelvis and head, arms and trunk (HAT) segments. In this ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/1350-4533(95)90374-k
更新日期:1995-01-01 00:00:00
abstract::The aim of this study is to assess the utility of traditional statistical pattern recognition techniques to help in obstructive sleep apnoea (OSA) diagnosis. Classifiers based on quadratic (QDA) and linear (LDA) discriminant analysis, K-nearest neighbours (KNN) and logistic regression (LR) were evaluated. Spectral and...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2009.05.010
更新日期:2009-10-01 00:00:00
abstract::An ambulatory monitoring system has been developed to measure the weight-bearing achieved by a patient on their fractured leg. The system is lightweight, portable, and can monitor weight-bearing continuously over an extended period of time. In addition to mean weight-bearing, the system can also determine temporal par...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/s1350-4533(98)00061-7
更新日期:1998-10-01 00:00:00
abstract::Core decompression is the most common procedure for treatment of the early stages of osteonecrosis of the femoral head. The purpose of this study was to compare the biomechanical performance of four different bone graft substitutes combined with core decompression. Subject-specific finite element models generated from...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2016.05.008
更新日期:2016-09-01 00:00:00
abstract::In order to assess the actual load on front teeth and tooth supportive tissue during brass instrument playing, a measuring system was developed permitting simultaneous recordings of mouthpiece forces and incisor deflections. By the application of strain gauges, the mouthpiece itself was converted into an extra-oral fo...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/1350-4533(95)00006-9
更新日期:1995-12-01 00:00:00
abstract::Three-dimensional surface imaging technologies have been used in the planning and evaluation of breast reconstructive and cosmetic surgery. The aim of this study was to develop a 3D surface imaging system based on the Microsoft Kinect and assess the accuracy and repeatability with which the system could image the brea...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2013.12.018
更新日期:2014-06-01 00:00:00
abstract::The purpose of this study was to determine the accuracy of a radiographic model-based tracking technique that measures the three-dimensional in vivo motion of the tibio-femoral joint during running. Tantalum beads were implanted into the femur and tibia of three subjects and computed tomography (CT) scans were acquire...
journal_title:Medical engineering & physics
pub_type: 临床试验,杂志文章
doi:10.1016/j.medengphy.2008.03.003
更新日期:2009-01-01 00:00:00
abstract::Cutting and drilling operations in bone are involved in many orthopedic and otolaryngological surgeries. The temperature elevation of these procedures is potentially harmful to bone and soft tissue cells. The research on this topic aims therefore at minimizing temperature elevation and finding optimal process paramete...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2016.06.019
更新日期:2016-10-01 00:00:00
abstract:BACKGROUND:An ideal prosthetic mesh for incisional hernia repair should mimic the anisotropic compliance of the abdominal wall, and at lower loads should exhibit higher distensibility without impairment of safety at higher loads. This study evaluated the biomechanical properties of six meshes in a rabbit model. METHOD...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2011.09.022
更新日期:2012-09-01 00:00:00
abstract:BACKGROUND:Verified and validated CT-based high-order finite element (FE) methods were developed that predict accurately the mechanical response of patient-specific intact femurs. Here we extend these capabilities to human femurs undergoing a total hip replacement using cemented prostheses. METHODS:A fresh-frozen huma...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2012.09.007
更新日期:2013-07-01 00:00:00
abstract::Hermetic electrical feedthroughs are essential for safe and functional active implantable biomedical devices and for a wide range of other applications such as batteries, supercapacitors, OLEDs and solar cells. Ceramics and metals have previously been the materials of choice for encapsulations, while polymers have adv...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2017.01.010
更新日期:2017-04-01 00:00:00
abstract::A few finite element models have addressed the dynamic juxtaarticular stress transmission but none focused the investigation on the combined influence of the individual moduli of the underlying bones, including the subchondral plate, the femoral head and the femoral neck of the proximal femur. A finite element model i...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2004.12.008
更新日期:2005-05-01 00:00:00
abstract::We have developed a computer-based system to simulate a guidewire in blood vessels for surgical planning, intra-operative assistance, and to facilitate the design of new guidewires. In this study, we compared simulation results with experimental results for validation of the simulation system. First, we inserted a com...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2014.09.012
更新日期:2014-12-01 00:00:00
abstract::The purpose of this study was to determine the use and feasibility of accelerometry-based monitoring and to examine a discrete multi-resolution signal analysis technique to determine motoric subtypes in patients with DSM-IV delirium. Forty consecutive patients receiving palliative care (23 male, 17 female, mean age+/-...
journal_title:Medical engineering & physics
pub_type: 临床试验,杂志文章
doi:10.1016/j.medengphy.2009.10.012
更新日期:2010-03-01 00:00:00
abstract::Aims of the present study were to test the hypotheses that (1) the compressive properties of articular cartilage are affected more by changes in the medium ionic concentration than the tensile properties, (2) collagen network controls the compression-tension nonlinearity of articular cartilage, and (3) proteoglycan (P...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2009.11.004
更新日期:2010-03-01 00:00:00
abstract::For many decades correlation and power spectrum have been primary tools for digital signal processing applications in the biomedical area. The information contained in the power spectrum is essentially that of the autocorrelation sequence; which is sufficient for complete statistical descriptions of Gaussian signals o...
journal_title:Medical engineering & physics
pub_type: 杂志文章,评审
doi:10.1016/j.medengphy.2010.04.009
更新日期:2010-09-01 00:00:00
abstract::The incudostapedial joint (ISJ) is a synovial joint connecting the incus and stapes in the middle ear. Mechanical properties of the ISJ directly affect sound transmission from the tympanic membrane to the cochlea. However, how ISJ properties change with frequency has not been investigated. In this paper, we report the...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2018.02.006
更新日期:2018-04-01 00:00:00
abstract::In laboratory animals as well as in human beings a depth of anaesthesia, where the subject has no pain or recall of events from the surgery, should be provided. Haemodynamic parameters such as heart rate and blood pressure are not a guarantee for an optimal depth of anaesthesia, especially when using neuromuscular blo...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/s1350-4533(98)00089-7
更新日期:1998-12-01 00:00:00
abstract::Dental implant stability influences the decision on the determination of the duration between implant insertion and loading. This work investigates the resonant frequency analysis by means of a numerical model. The investigation is done numerically through the determination of the eigenfrequencies and performing stead...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2019.02.008
更新日期:2019-04-01 00:00:00
abstract::Quantifying the risk of falling (falls risk) would be helpful in treating people with gait disorders. The gait sensitivity norm (GSN) is a stability measure that correlates well to risk of falling in passive dynamic walkers but has not been evaluated on humans or human-like walking models. We assessed the correlation ...
journal_title:Medical engineering & physics
pub_type: 杂志文章
doi:10.1016/j.medengphy.2013.03.018
更新日期:2013-10-01 00:00:00