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Titolo:
A realistic three dimensional FEM of the human head
Autore:
Bonovas, PM; Kyriacou, GA; Sahalos, JN;
Indirizzi:
Democritus Univ Thrace, Dept Elect & Comp Engn, GR-67100 Xanthi, Greece Democritus Univ Thrace Xanthi Greece GR-67100 n, GR-67100 Xanthi, Greece Aristotelian Univ Salonika, Dept Phys, GR-54006 Salonika, Greece Aristotelian Univ Salonika Salonika Greece GR-54006 006 Salonika, Greece
Titolo Testata:
PHYSIOLOGICAL MEASUREMENT
fascicolo: 1, volume: 22, anno: 2001,
pagine: 65 - 76
SICI:
0967-3334(200102)22:1<65:ARTDFO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
POTENTIALS; MODELS;
Keywords:
finite element modelling; human head model; impedance; electrical impedance tomography; brain source localization; electrode effects; electroencephalography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Kyriacou, GA Democritus Univ Thrace, Dept Elect & Comp Engn, GR-67100 Xanthi, Greece Democritus Univ Thrace Xanthi Greece GR-67100 anthi, Greece
Citazione:
P.M. Bonovas et al., "A realistic three dimensional FEM of the human head", PHYSL MEAS, 22(1), 2001, pp. 65-76

Abstract

A realistic three-dimensional finite element model (FEM) of the human headhas been developed. Separate layers for the scalp, skull, cerebrospinal fluid (CSF) and brain were modelled. Hexahedral elements, a special master matrix assembly technique and an iterative successive over-relaxation (SOR) solution scheme were employed. This approach enabled rapid modelling with minimal memory requirements, which makes this method practical if used for electrical impedance tomography (EIT) or source localization inverse problems. Compared to scalp electrodes, subdural voltage sensing electrodes were three to four times more sensitive close to an oedema or source region, if itwas peripheral, but this decreased to 30%-40% for central oedema or sourceregions. Scalp current injecting electrodes are preferable, since the maximum allowable current is 10 times larger than that of the subdural ones. The distance of voltage sensing electrodes from a region to be imaged highly affects sensitivity, so depth electrodes will be more sensitive, provided that they are close to the region of interest. Finally, the electrode size has significant effects on the input or transfer impedance.

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Documento generato il 09/04/20 alle ore 12:38:44