A Resistive Mesh Phantom for Assessing the Performance of EIT Systems

Gagnon, Hervé; Cousineau, Martin; Adler, Andy; Hartinger, Alzbeta

doi:10.1109/tbme.2010.2052618

Cited by 52 publications

(38 citation statements)

References 10 publications

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“…Nilai frekuensi ini tentu cukup besar sehingga pada EIT, cenderung mengabaikan permitivitas dan hanya mempertimbangkan nilai konduktivitas saja. Permasalahan pada Gambar 2 dapat diselesaikan dengan metode matriks dengan mengetahui bahwa merupakan tegangan yang terukur, merupakan arus yang keluar pada node ke-, dan adalah nilai dari elemen yang menghubungkan antara nilai node ke-dan nilai node ke- [10]. Berdasarkan hukum Kirchoff, pada node berlaku persamaan (1).…”

Section: Metode Penelitianunclassified

2D Imaging Technique Electrical Impedance Distribution on Liquid with Paired Method and Using EIDORS Software

Zarkasi

Abdurrouf

Santoso

2017

Nat-B

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ABSTRAKPaper ini membahas tentang pencitraan 2D distribusi impedansi listrik pada zat cair dengan menggunakan prinsip Electrical Impedance Tomography (EIT). Teknik tomografi yang digunakan dalam proses pencitraan adalah metode berpasangan (metode tetangga), dengan data-data input didapatkan dari hasil pengukuran potensial listrik pada bidang batas objek ukur. Data-data hasil pengukuran direkonstruksi menggunakan software open source, yakni EIDORS, yang dalam rekonstruksi citra menggunakan prinsip Finite Element Method (FEM). Sebagai pembanding atas hasil rekonstruksi citra oleh EIDORS, di sini digunakan Boundary Data Simulation (BDS) yang didapatkan dari data pengukuran yang sama. Berdasarkan hasil-hasil dari gambar citra 2D yang telah didapatkan, terbukti bahwa teknik dan metode pencitraan yang telah digunakan mampu memperlihatkan distribusi nilai impedansi listrik dari objek ukur serta memiliki kesesuaian yang baik dengan hasil dari BDS. Kata Kunci: EIT, metode berpasangan, EIDORS, FEM, BDS. ABSTRACT This paper discusses the 2D imaging technique of the electrical impedance distribution in the liquid by using the principles of Electrical Impedance Tomography (EIT). A tomographic technique used in

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Section: Metode Penelitianunclassified

2D Imaging Technique Electrical Impedance Distribution on Liquid with Paired Method and Using EIDORS Software

Zarkasi

Abdurrouf

Santoso

2017

Nat-B

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“…33. Square pulses with amplitude of 40 μV peak-to-peak and frequency ranging from 1 to 8 Hz were injected to validate proper signal representation.…”

Section: Eeg Phantommentioning

confidence: 99%

Multichannel wearable system dedicated for simultaneous electroencephalography∕near-infrared spectroscopy real-time data acquisitions

Lareau

Lesage²,

Pouliot

et al. 2011

J. Biomed. Opt.

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Abstract. Functional neuroimaging is becoming a valuable tool in cognitive research and clinical applications. The clinical context brings specific constraints that include the requirement of a high channel count to cover the whole head, high sensitivity for single event detection, and portability for long-term bedside monitoring. For epilepsy and stroke monitoring, the combination of electroencephalography (EEG) and functional near-infrared spectroscopy (NIRS) is expected to provide useful clinical information, and efforts have been deployed to create prototypes able to simultaneously acquire both measurement modalities. However, to the best of our knowledge, existing systems lack portability, NIRS sensitivity, or have low channel count. We present a battery-powered, portable system with potentially up to 32 EEG channels, 32 NIRS light sources, and 32 detectors. Avalanche photodiodes allow for high NIRS sensitivity and the autonomy of the system is over 24 h. A reduced channel count prototype with 8 EEG channels, 8 sources, and 8 detectors was tested on phantoms. Further validation was done on five healthy adults using a visual stimulation protocol to detect local hemodynamic changes and visually evoked potentials. Results show good concordance with literature regarding functional activations and suggest sufficient performance for clinical use, provided some minor adjustments were made. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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“…The closeness of the measured potential data, V to the estimated data set, V generated by a Finite Element Model of the homogenous tank is described as Accuracy (AC) of a measurement system [6]. The simulated potentials are normalized to give a best fit to the real measurement obtained by phantom experiments.…”

Section: Snr V Sdmentioning

confidence: 99%

Performance Evaluation of a Digital Electrical Impedance Tomography System

Ayati¹,

Bouazza-Marouf²,

Kerr³

et al. 2012

Imaging and Signal Processing in Health Care and Technology / 772: Human-Computer Interaction / 773: Communication, Internet An

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Performance evaluation of a portable digital multifrequency electrical impedance tomography system is presented. The instrumentation hardware and image reconstruction are assessed according to a systematic methodology using a practical phantom. The phantom is equipped with eight electrodes in a ring configuration and a sinusoidal current of constant amplitude is injected using an adjacent current injection protocol. Artificial anomalies are introduced as inhomogeneity targets and the boundary potential data is collected. The images are reconstructed from the boundary data using Comsol Multiphysics and Matlab. Signal to noise ratio (SNR) and accuracy of the measurements are calculated. The limits of detectability and distinguishability of contrasts are measured from the collected potential data set for single and double inhomogeneities. The conductivity of the targets is successfully reconstructed from the potential data measurements. The detectability value is found to be high when a single target is close to the electrodes, while the values are less for the target in the centre. Also, the value of distinguishability increases when the targets move further away from each other.

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A Resistive Mesh Phantom for Assessing the Performance of EIT Systems

Cited by 52 publications

References 10 publications

2D Imaging Technique Electrical Impedance Distribution on Liquid with Paired Method and Using EIDORS Software

2D Imaging Technique Electrical Impedance Distribution on Liquid with Paired Method and Using EIDORS Software

Multichannel wearable system dedicated for simultaneous electroencephalography∕near-infrared spectroscopy real-time data acquisitions

Performance Evaluation of a Digital Electrical Impedance Tomography System

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