Measurement of the specific heat capacity of liver phantom

Prakash, Punit; Converse, M.C.; Mahvi, David M.; Webster, John G.

doi:10.1088/0967-3334/27/10/n01

Cited by 14 publications

(10 citation statements)

References 13 publications

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“…e liver phantom is made of distilled water 48.8%, sucrose 47.56%, sodium chloride 1.21%, and Tween 20 (kind of surface active agent) 2.43%. e liver phantom's electrical conductivity was assumed as 1.7434 S/m, relative permittivity was assumed as 43.8213, and loss tangent was assumed as 0.2919 [23,24].…”

Section: Liver Phantommentioning

confidence: 99%

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Helical Slot Antenna for the Microwave Ablation

Lee

Son

2019

International Journal of Antennas and Propagation

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In this study, a thin coaxial antenna for microwave ablation (MWA) is proposed. A helical slot is added between two slots in order to overcome the disadvantage of the radiation range extending to the unwanted part in the conventional single-slot and double-slot applicators. By adding a helical slot, the specific absorption rate (SAR) pattern is more concentrated near the slot as compared with the conventional slot. Experiments were conducted using the simulation, and a liver phantom was made and heated up using microwaves. Based on the results on the liver phantom, experiments were conducted using swine liver which is similar to human liver. Applied frequency and microwave average input power were assumed as 2.45 GHz and 50 W (47 dBm), respectively. As a result of the experiment, return loss was −23.09 dB, and the temperature reached 60°C after 90 seconds of exposition. Based on the phantom experiments of the swine liver, necrotic lesions of the tissue at a distance of 3.5–4 cm from the microwave antenna were observed.

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Section: Liver Phantommentioning

confidence: 99%

“…(Table 2). e proposed model includes the following assumptions, namely, the hepatic tissue is considered as linear, homogenous, and isotropic medium, and the wave equation under time harmonic conditions is expressed as [24] ∇…”

Section: Liver Phantommentioning

confidence: 99%

Helical Slot Antenna for the Microwave Ablation

Lee

Son

2019

International Journal of Antennas and Propagation

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“…The accuracy of phantoms with respect to real tissues is often specified by the root-mean-square error (RMSE), but also by the mean squared error (MSE) and the relative error. From Table II, one can observe that many of them have large deviations [40], [96], [98], [101], [103], [104]. Others do not even conform to tissue values, but such phantoms are created so that the differences between their values are equivalent to those of the tissues of interest [92], [100].…”

Section: B a Experimental Tissue-equivalent Phantomsmentioning

confidence: 99%

“…As previously mentioned, many phantoms are designed for microwave imaging for breast cancer detection [91], [92], [96], [97], [99], [100], [102], [105]. In contrast, formulas for gastrointestinal phantoms are less studied [40], [41], [94], [104], restricting the possibilities to accurately testing those in-body devices which could make use of the UWB benefits to improve their performance, e.g. capsule endoscope.…”

Section: B a Experimental Tissue-equivalent Phantomsmentioning

confidence: 99%

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

Garcia-Pardo

Andreu

Fornés-Leal

et al. 2018

IEEE Antennas Propag. Mag.

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In-body sensor networks are those networks where at least one of the sensors is located inside the human body. Such wireless in-body sensors are mainly used for medical applications, collecting and monitoring important parameters for health and diseases treatment. The IEEE Standard 802.15.6-2012 for Wireless Body Area Networks (WBAN) considers in-body communications in the Medical Implant Communication Service (MICS) band. Nevertheless, high data rate communications are not feasible at the MICS band due to its narrow occupied bandwidth. In this framework, Ultra-Wideband (UWB) systems have emerged as a potential solution for in-body high data rate communications, due to its miniaturization capabilities or low power consumption. In the last years, some open issues have determined the research about in-body propagation. Firstly, the propagation medium, i.e., the human body tissues, is frequencydependent and exhibits a large attenuation at UWB frequencies. Secondly, the behavior of the in-body antennas is highly dominated by the surrounding tissues. Thus, the in-body channel characterization in UWB depends not only on the channel behavior itself, but also on the methodology of characterization. This paper intends to outline the research performed in the field of UWB in-body radio channel characterization considering the propagation medium, as well as the methodology of analysissoftware simulations, phantom measurements, in vivo measurements-. Thus, authors provide an overall perspective of the current state of the art, limitations for the analysis of in-body propagation, and future perspectives for UWB in-body channel analysis.

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“…The amounts of ingredients are reported in % w/w. HEC = Hydroxyethyl cellulose a Data are presented by Prakash et al (2006). 5 this fact, stable heterogeneous breast phantoms for ultra-wide band frequencies (0.5-20 GHz) have been developed.…”

Section: A 44mentioning

confidence: 99%

Tissue-Mimicking Gel Phantoms for Thermal Therapy Studies

et al. 2014

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Tissue-mimicking phantoms that are currently available for routine biomedical applications may not be suitable for high-temperature experiments or calibration of thermal modalities. Therefore, design and fabrication of customized thermal phantoms with tailored properties are necessary for thermal therapy studies. A multitude of thermal phantoms have been developed in liquid, solid, and gel forms to simulate biological tissues in thermal therapy experiments. This article is an attempt to outline the various materials and techniques used to prepare thermal phantoms in the gel state. The relevant thermal, electrical, acoustic, and optical properties of these phantoms are presented in detail and the benefits and shortcomings of each type are discussed. This review could assist the researchers in the selection of appropriate phantom recipes for their in vitro study of thermal modalities and highlight the limitations of current phantom recipes that remain to be addressed in further studies.

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Measurement of the specific heat capacity of liver phantom

Cited by 14 publications

References 13 publications

Helical Slot Antenna for the Microwave Ablation

Helical Slot Antenna for the Microwave Ablation

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

Tissue-Mimicking Gel Phantoms for Thermal Therapy Studies

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