Abstract:
:A recently presented solution method for the bidomain model (Johnston et al. 2006), which involves the application of direct current for studying electrical potential in a slab of cardiac tissue, is extended here to allow the use of an applied alternating current. The advantage of using AC current, in a four-electrode method for determining cardiac conductivities, is that instead of using 'close' and 'wide' electrode spacings to make potential measurements, increasing the frequency of the AC current redirects a fraction of the current from the extracellular space into the intracellular space. The model is based on the work of Le Guyader et al. (2001), but is able to include the effects of the fibre rotation between the epicardium and the endocardium on the potentials. Also, rather than using a full numerical technique, the solution method uses Fourier series and a simple one dimensional finite difference scheme, which has the advantage of allowing the potentials to be calculated only at points, such as the measuring electrodes, where they are required. The new alternating current model, which includes intracellular capacitance, is used with a particular four-electrode configuration, to show that the potential measured is affected by changes in fibre rotation. This is significant because it indicates that it is necessary to include fibre rotation in models, which are to be used in conjunction with measuring arrays that are more complex than those involving simply surface probes or a single vertical probe.
journal_name
Comput Methods Biomech Biomed Enginauthors
Johnston BM,Johnston PR,Kilpatrick Ddoi
10.1080/10255840701747594subject
Has Abstractpub_date
2008-06-01 00:00:00pages
223-33issue
3eissn
1025-5842issn
1476-8259pii
790456790journal_volume
11pub_type
杂志文章abstract::The magnitude and distribution of bone and muscle mass within limbs affect limb inertial properties, maximum movement speed and the energy required to maintain submaximal movements. Musculoskeletal modeling and movement simulations were used to determine how changes in bone and muscle cross-sectional area (and thus ma...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 临床试验,杂志文章
doi:10.1080/10255840410001727823
更新日期:2004-06-01 00:00:00
abstract::The aim of this study is to evaluate the fracture union or non-union for a specific patient that presented oblique fractures in tibia and fibula, using a mechanistic-based bone healing model. Normally, this kind of fractures can be treated through an intramedullary nail using two possible configurations that depends o...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2015.1125473
更新日期:2016-09-01 00:00:00
abstract::Since the discovery of X-rays, medical imaging has played a major role in the guidance of surgical procedures. While medical imaging began with simple X-ray plates to indicate the presence of foreign objects within the human body, the advent of the computer has been a major factor in the recent development of this fie...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章,评审
doi:10.1080/10255840008907997
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abstract::In order to improve the reliability of children's models, the aim of this study was to determine the subject-specific masses and 3D locations of the centres of mass (CoM) of body segments using biplanar X-rays. Previous methods, validated on upper leg segments, were applied to the whole body. Six children and six adul...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255841003717608
更新日期:2010-12-01 00:00:00
abstract::A three-dimensional finite element model is developed for the simulation of the sound transmission through the human auditory periphery consisting of the external ear canal, middle ear and cochlea. The cochlea is modelled as a straight duct divided into two fluid-filled scalae by the basilar membrane (BM) having an or...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2012.737458
更新日期:2014-08-01 00:00:00
abstract::Mechanical stresses develop within vocal fold (VF) soft tissues due to phonation-associated vibration and collision. These stresses in turn affect the hydration of VF tissue and thus influence voice health. In this paper, high-fidelity numerical computations are described, taking into account fully 3D geometry, realis...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2013.772591
更新日期:2014-01-01 00:00:00
abstract::The rate of bone loss is subject to considerable variation between individuals. With the 'mechanostat' model of Frost, genetic variations in bone mechanoresponsiveness are modelled by different mechanostat 'setpoints'--which may also change with age or disease. In this paper, the following setpoints are used: epsilonm...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255840802136150
更新日期:2008-10-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章,随机对照试验
doi:10.1080/10255840701550915
更新日期:2008-02-01 00:00:00
abstract::The decompensated univentricular circulation is identified as one of the most challenging conditions and the application of the mechanical circulatory support (MCS) devices is proposed as therapeutic option for Fontan failure. Modelling methodologies are reported to identify the optimized types, extent and duration of...
journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255840500141593
更新日期:2005-02-01 00:00:00
abstract::New trends of numerical models of human joints require more and more computation of both large amplitude joint motions and fine bone stress distribution. Together, these problems are difficult to solve and very CPU time consuming. The goal of this study is to develop a new method to diminish the calculation time for t...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/1025584021000016843
更新日期:2002-12-01 00:00:00
abstract::This study evaluated the polymerization shrinkage stress of three tooth preparation designs for indirect ceramic overlay by finite element analysis: isthmus preparation (IST); without isthmus preparation (wIST); and non-retentive preparation (nRET). The models were created based in prepared dental typodonts and were d...
journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2020.1866561
更新日期:2021-01-07 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2016.1181174
更新日期:2016-11-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2019.1577398
更新日期:2019-05-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
doi:10.1080/10255842.2017.1399262
更新日期:2017-11-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
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doi:10.1080/10255842.2017.1338691
更新日期:2017-08-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
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journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
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更新日期:2019-02-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
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更新日期:2016-01-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
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更新日期:2016-12-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
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journal_title:Computer methods in biomechanics and biomedical engineering
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更新日期:2020-11-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
pub_type: 杂志文章
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更新日期:2018-07-01 00:00:00
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journal_title:Computer methods in biomechanics and biomedical engineering
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doi:10.1080/01495739808936708
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