ChemInform Abstract: Dielectric Parameters Relevant to Microwave Dielectric Heating

Gabriel, Camelia; Gabriel, Sami; Grant, E H; Halstead, Ben S. J.; Mingos, D. Michael P.

doi:10.1002/chin.199835351

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…Some tissues in which the electrical properties have been allocated identical values have been grouped together. Conductivity values are taken from Gandhi and Chen (1999), and permittivity values from Gabriel and Gabriel (2002)…”

Section: Finite Integration Techniquementioning

confidence: 99%

“…In this data-set, the body is modelled using voxels that are originally 1 × 1 × 1 mm 3 in size and classified using 31 different 'material' types, each corresponding to a different biological tissue. Each tissue type was assigned an electrical conductivity and permittivity using literature values Chen 1999, Gabriel andGabriel 2002), and these are listed in table 1. In order to keep the time required for calculation of field values for a single arrangement to less than 1 week, the spatial resolution of the body model was coarsened to 6 × 6 × 6 mm 3 .…”

Section: Human Body Modelmentioning

confidence: 99%

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Electric fields induced in the human body by time-varying magnetic field gradients in MRI: numerical calculations and correlation analysis

Bencsik¹,

Bowtell²,

Bowley³

2007

Phys. Med. Biol.

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The spatial distributions of the electric fields induced in the human body by switched magnetic field gradients in MRI have been calculated numerically using the commercial software package, MAFIA, and the three-dimensional, HUGO body model that comprises 31 different tissue types. The variation of |J|, |E| and |B| resulting from exposure of the body model to magnetic fields generated by typical whole-body x-, y- and z-gradient coils has been analysed for three different body positions (head-, heart- and hips-centred). The magnetic field varied at 1 kHz, so as to produce a rate of change of gradient of 100 T m(-1) s(-1) at the centre of each coil. A highly heterogeneous pattern of induced electric field and current density was found to result from the smoothly varying magnetic field in all cases, with the largest induced electric fields resulting from application of the y-gradient, in agreement with previous studies. By applying simple statistical analysis to electromagnetic quantities within axial planes of the body model, it is shown that the induced electric field is strongly correlated to the local value of resistivity, and the induced current density exhibits even stronger correlation with the local conductivity. The local values of the switched magnetic field are however shown to bear little relation to the local values of the induced electric field or current density.

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Section: Finite Integration Techniquementioning

confidence: 99%

Section: Human Body Modelmentioning

confidence: 99%

Electric fields induced in the human body by time-varying magnetic field gradients in MRI: numerical calculations and correlation analysis

Bencsik¹,

Bowtell²,

Bowley³

2007

Phys. Med. Biol.

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“…7,35,36 MWA heat-generating capabilities depend upon electromagnetic radiation (EMR), which causes a fast-switching rotation at atomic or molecular levels of electric dipoles, mostly water, generating heat by dielectric hysteresis obtained by the friction of water molecules. 37 It follows that MWA is especially effective in tissues with high water concentration; in the context of breast ablation, it is thought that tumor cells are preferentially destroyed, with a relative sparing of normal fatty breast tissue that has a lower water content. 38 MWA is usually more painful than RFA and CYA.…”

Section: Mwa In Breast Cancermentioning

confidence: 99%

Ablative Therapies for Breast Cancer: State of Art

Carriero

Lanza

Pellegrino

et al. 2023

Technol Cancer Res Treat

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Breast cancer (BC) is the most frequently diagnosed malignancy among women. In the past two decades, new technologies and BC screening have led to the diagnosis of smaller and earlier-stage BC (ESBC). Therefore, percutaneous minimally invasive techniques (PMIT) were adopted to treat patients unfit for surgery, women who refuse it, or elderly patients with comorbidities that could make surgery a difficult and life-threatening treatment. The target of PMIT is small-size ESBC with the scope of obtaining similar efficacy as surgery. Minimally invasive treatments are convenient alternatives with promising effectiveness, lower morbidity, less cost, less scarring and pain, and more satisfying cosmetic results. Ablative techniques used in BC are cryoablation, radiofrequency ablation, microwave ablation, high-intensity focused ultrasound (US), and laser ablation. The aim of our study is to discuss the current status of percutaneous management of BC, evaluate the clinical outcomes of PMIT in BC, and analyze future perspectives regarding ablation therapy in BC.

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