Characterization of Human Head Phantom based on its Dielectric Properties for Wideband Microwave Imaging Application

Said, Mohd Sollehudin Md; Seman, Norhudah; Jaafar, Haliza

doi:10.11113/jt.v73.4405

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Contact impedance measurements were performed directly after the phantoms were removed from the fridge at a temperature of 2.3±1 • C (measured using a thermometer (Hanna Instruments, HI935002)). The contact impedance responses of the gelatine phantoms were measured within a period of time of less than 5 minutes to maintain a constant temperature on the phantom during the experimental measurements as the electrical properties of the phantom vary with temperature [32], [47]. After each use the phantom was covered in well zipped plastic storage bags, placed in a plastic box, and returned to the fridge to be used the next day.…”

Section: A Impedance Measurementsmentioning

confidence: 99%

Investigating Gelatine Based Head Phantoms for Electroencephalography Compared to Electrical and Ex Vivo Porcine Skin Models

Owda

Casson

2021

IEEE Access

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Gelatine based phantoms for electrophysiology are becoming widely used as they allow the controlled validation of new electrode and new instrumentation designs. The phantoms mimic the electrical properties of the human body and allow a pre-recorded electrophysiology signal to be played-out, giving a known signal for the novel electrode or instrumentation to collect. Such controlled testing is not possible with on-person experiments where the signal to be recorded is intrinsically unknown. However, despite the rising interest in gelatine based phantoms there is relatively little public information about their electrical properties and accuracy, how these vary with phantom formulation, and across both time and frequency. This paper investigates ten different phantom configurations, characterising the impedance of the gelatine and electrodes, comparing this to both previously reported electrical models of Ag/AgCl electrodes placed on skin and to a model made from ex vivo porcine skin. This article shows how the electrical properties of the phantoms can be tuned using different concentrations of gelatine and of sodium chloride (NaCl) added to the mixture, and how these properties vary over the course of seven days for a.c. frequencies in the range 20-1000 Hz. The results demonstrate that gelatine phantoms can accurately mimic the frequency response properties of the body-electrode system to allow for the controlled testing of new electrode and instrumentation designs.INDEX TERMS Gelatine phantoms, tissue-mimicking, electrical properties, electrophysiology, electroencephalography (EEG), electrocardiogram (ECG).

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Section: A Impedance Measurementsmentioning

confidence: 99%

Investigating Gelatine Based Head Phantoms for Electroencephalography Compared to Electrical and Ex Vivo Porcine Skin Models

Owda

Casson

2021

IEEE Access

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“…Contact impedance measurements were performed directly after the phantoms were removed from the fridge at a temperature of 2.3±1 • C (measured using a thermometer (Hanna Instruments, HI935002)). The contact impedance responses of the gelatine phantoms were measured within a period of time of less than 5 minutes to maintain a constant temperature on the phantom during the experimental measurements as the electrical properties of the phantom vary with temperature [29], [41]. After each use the phantom was placed in a plastic box and returned to the fridge to be used the next day.…”

Section: A Impedance Measurementsmentioning

confidence: 99%

Electrical properties, accuracy, and multi-day performance of gelatine phantoms for electrophysiology

Owda

Casson

2020

Preprint

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Gelatine based phantoms for electrophysiology are becoming widely used as they allow the controlled validation of new electrode and new instrumentation designs. The phantoms mimic the electrical properties of the human body and allow a pre-recorded electrophysiology signal to be played-out, giving a known signal for the novel electrode or instrumentation to collect. Such controlled testing is not possible with on-person experiments where the signal to be recorded is intrinsically unknown. However, despite the rising interest in gelatine based phantoms there is relatively little public information about their electrical properties and accuracy, how these vary with phantom formulation, and across both time and frequency. This paper investigates ten different phantom configurations, characterising the impedance path through the phantom and comparing this impedance path to both previously reported electrical models of Ag/AgCl electrodes placed on skin and to a model made from ex vivo porcine skin. This article shows how the electrical properties of the phantoms can be tuned using different concentrations of gelatine and of sodium chloride (NaCl) added to the mixture, and how these properties vary over the course of seven days for a.c. frequencies in the range 20-1000 Hz. The results demonstrate that gelatine phantoms can accurately mimic the frequency response properties of the body-electrode system to allow for the controlled testing of new electrode and instrumentation designs.

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“…has been studied for their potential as a phantom material and several studies have proved their properties as a tissue-equivalent material [ 10 , 11 , 12 ]. The composition and electrical properties of the tissue-mimicking phantom material are also important for better modelling of the phantom, adhering to the body structure represented by the phantom [ 13 ]. In order to develop composite phantom materials with tailored properties, one should be able to predict a property of a composite based on the properties of its constituents [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Percentages of Binders on the Physico-Mechanical Properties of Rhizophora spp. Particleboard as Natural-Based Tissue-Equivalent Phantom for Radiation Dosimetry Applications

et al. 2021

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Rhizophora spp. particleboard with the incorporation of lignin and soy flour as binders were fabricated and the influence of different percentages of lignin and soy flour (0%, 6% and 12%) on the physico-mechanical properties of the particleboard were studied. The samples were characterised by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray fluorescence (XRF) and internal bonding. The results stipulated that the addition of binders in the fabrication of the particleboard did not change the functional groups according to the FTIR spectrum. For XRD, addition of binders did not reveal any major transformation within the composites. SEM and EDX analyses for all percentages of binders added showed no apparent disparity; however, it is important to note that the incorporation of binders allows better bonding between the molecules. In XRF analysis, lower percentage of chlorine in the adhesive-bonded samples may be advantageous in maintaining the natural properties of the particleboard. In internal bonding, increased internal bond strength in samples with binders may indicate better structural integrity and physico-mechanical strength. In conclusion, the incorporation of lignin and soy flour as binders may potentially strengthen and fortify the particleboard, thus, can be a reliable phantom in radiation dosimetry applications.

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Characterization of Human Head Phantom based on its Dielectric Properties for Wideband Microwave Imaging Application

Cited by 5 publications

References 24 publications

Investigating Gelatine Based Head Phantoms for Electroencephalography Compared to Electrical and Ex Vivo Porcine Skin Models

Investigating Gelatine Based Head Phantoms for Electroencephalography Compared to Electrical and Ex Vivo Porcine Skin Models

Electrical properties, accuracy, and multi-day performance of gelatine phantoms for electrophysiology

Influence of Different Percentages of Binders on the Physico-Mechanical Properties of Rhizophora spp. Particleboard as Natural-Based Tissue-Equivalent Phantom for Radiation Dosimetry Applications

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