Current sheet applicators for clinical microwave hyperthermia

Gopal, M.K.; Cetas, Thomas C.

doi:10.1109/22.223741

Cited by 18 publications

(7 citation statements)

References 24 publications

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“…245 Similarly, hyperthermia treatment of cancer using microwaves exposes the body tissue to high temperatures for a period of time, with minimal injury to the surrounding healthy tissue. 10,246 Microwave ablation is another application of microwaves which could be used for the treatment of liver cancer. [247][248][249][250] Microwave energy is emitted by the Microwave Coaxial Antenna (MCA) which generates heat in the local cancerous tissue without affecting the surrounding tissue.…”

Section: Biomedical Applicationsmentioning

confidence: 99%

Microwave material processing—a review

2011

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Microwave heating is caused by the ability of the materials to absorb microwave energy and convert it to heat. This article represents a review on fundamentals of microwave heating and their interaction with materials for various applications in a comprehensive manner. Experimental studies of single, multimode, and variable frequency microwave processing were reviewed along with their applications. Modeling of microwave heating based on Lambert's law and Maxwell's electromagnetic field equations have also been reviewed along with their applications. Modeling approaches were used to predict the effect of resonances on microwave power absorption, the role of supports for microwave heating, and to determine the nonuniformity on heating rates. Various industrial applications on thermal processing have been reviewed. There is tremendous scope for theoretical and experimental studies on the athermal effects of microwaves. Some of the unresolved problems are identified and directions for further research are also suggested.

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Section: Biomedical Applicationsmentioning

confidence: 99%

Microwave material processing—a review

2011

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“…The typical mechanical support arm and applicator size may lead to clinical difficulties such as patient discomfort and anxiety, as well as difficulty aligning the applicator for uniform heating of complex contoured tissue regions. More compact microwave applicators have been developed such as the Current Sheet Applicator (CSA) [9,10], though conformability to contoured surfaces is still a limitation. Flexible printed circuit board (PCB) based microstrip applicators have been explored as alternative devices due to their light-weight and flexible construction which allows greater clinical versatility.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a dual-arm Archimedean spiral array for microwave hyperthermia

Johnson

Neuman

Maccarini

et al. 2006

International Journal of Hyperthermia

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“…Data (open symbols) were taken from ®gure 8(a, b) and symmetrized to correct for slight di erences in the RF power applied to both CSA. Also included are the results (solid curves (a, b)) of the one-dimensional model (equations (3,6)). A temperature o set (18C) was added to the experimental data … ¢'ˆ1808 † to account for the temperature uncertainty at the iso-centre.…”

Section: Discussionmentioning

confidence: 99%

Performance and use of current sheet antennae for RF-hyperthermia of a phantom monitored by 3 tesla MR-thermography

Hoffmann

Rhein

Wojcik

et al. 2002

International Journal of Hyperthermia

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Several MR-compatible current sheet antennae (CSA) of different height (h) (16 cm (l) x 8 cm (w) x 1-5 cm (h)) were built for simulated RF (96 MHz) hyperthermia of a medium-sized (12l) tissue-equivalent phantom inside a 3 tesla whole body tomograph. Prior to use, efficiencies of the CSA were determined by network analysis and by calorimetry. Depending on the height h of the CSA and on the thickness d(bolus) of the water bolus used for RF-coupling of the CSA to the lossy medium, their efficiency varied between 20-70% and the CSA with h = 3 cm was selected for simulated RF hyperthermia. During heating, spatial temperature distributions (20-42 degrees C) of five slices (voxel size 2 x 2 x 10mm(3)) were recorded intermittently within 4 s/slice by measuring the temperature dependent shift of the (1)H resonance frequency (125.32 MHz). A phased array consisting of two identical CSA produced distinctly different spatial temperature distributions at 0 and 180 degrees phase difference between both RF channels feeding the antennae. Within a one-dimensional heat diffusion model, the specific absorption rate (SAR) of the electromagnetic wave generated by a single antenna was deduced from the experimental data resulting in a penetration depth (1/e(2)) of approximately 4 cm.

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Current sheet applicators for clinical microwave hyperthermia

Cited by 18 publications

References 24 publications

Microwave material processing—a review

Microwave material processing—a review

Evaluation of a dual-arm Archimedean spiral array for microwave hyperthermia

Performance and use of current sheet antennae for RF-hyperthermia of a phantom monitored by 3 tesla MR-thermography

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