Study of Water Bolus Effect on Sar Penetration Depth and Effective Field Size for Local Hyperthermia

Ebrahimi-Ganjeh, Mohammad Ali; Attari, Amir Reza

doi:10.2528/pierb08011403

Cited by 27 publications

(26 citation statements)

References 15 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Compared with the temperature distribution in Fig. 9(c), the effective treatment region now becomes a circular one as the thickness of water bolus increase, which accords with what has been observed in [25]. In this case, the highest temperature is recorded at 0.40 cm under the skin-muscle interface in muscle, and raised to 45.51 • C.…”

Section: Effects Of Water Bolussupporting

confidence: 75%

Superficial Tumor Hyperthermia With Flat Left-Handed Metamaterial Lens

Gong¹,

Wang²

2009

PIER

View full text Add to dashboard Cite

Abstract-Flat left-handed metamaterial (LHM) lens can generate appropriate focusing spot in biological tissue as required in microwave tumor hyperthermia treatment. By using single flat LHM lens to concentrate microwave in a mass of tissue covered by water bolus, microwave hyperthermia scheme is proposed for superficial tumor hyperthermia. The power distribution in tissue is simulated by finitedifference time-domain method, and the thermal pattern is calculated by solving the bio-heat transfer equation. It is demonstrated that, by using a flat LHM lens of thickness of 4 cm to concentrate microwave of 2.45 GHz, a temperature above 42 • C can be achieved and maintained in one hour in a tissue region of about 1.0 cm in width and 1.2 cm in depth in tissue with the source amplitude of 43.44 V/cm, which is suitable for superficial tumor hyperthermia. By adjusting the position of microwave source, the heating zone in tissue can be adjusted in both the lateral and depth direction in tissue. The influence of fat layer, effects of water bolus and microwave frequency on hyperthermia, is investigated as well.

show abstract

Section: Effects Of Water Bolussupporting

confidence: 75%

Superficial Tumor Hyperthermia With Flat Left-Handed Metamaterial Lens

Gong¹,

Wang²

2009

PIER

View full text Add to dashboard Cite

show abstract

“…Parallel plane distributions were obtained in order to analyze the behavior of this applicator at greater depths (> 2 cm). In accordance with the definition of depth penetration [27] (See Eq. (10)), the penetration reached, in muscle tissue, should be approximately 6 cm.…”

Section: Fem Modeling Of a Whole Hyperthermia System (Applicator-phanmentioning

confidence: 99%

Fem Modeling for Performance Evaluation of an Electromagnetic Oncology Deep Hyperthermia Applicator When Using Monopole, Inverted T, and Plate Antennas

Trujillo-Romero¹,

Salas²,

Vera³

2011

PIER

View full text Add to dashboard Cite

Abstract-This study focuses on the evaluation of the performance of a rectangular waveguide for deep hyperthermia when different antennas are used. Although there are several models of hyperthermia applicators, there are no studies of the advantages of employing different antennas for waveguides used in deep seated tumor treatments. Monopole antennas are the most used radiating elements inside waveguides. Here, the modeling of a monopole and two new proposed antennas, inverted T and plate, in order to find their optimal performance is presented. Parameters like output power, SWR and transmission coefficient generated for each modeled antenna were calculated by using the finite element method. The antennas with the best performance were selected in order to model an applicator-phantom system, which was used to calculate the temperature distributions generated inside the muscle phantom. The models were based on Maxwell and bioheat equations. Finally, thermal distributions were obtained and compared. The results indicate that the plate antenna generated a better focusing. The SWR obtained was 1.25, the output power was 54.71 W of 66 W applied, and the 42 • C isotherm had a size of 2 cm × 2 cm.

show abstract

“…The measured power levels were converted to relative specific absorption rate (SAR) by utilizing Equation (5). The density of muscle was taken equal to be 1050 kg/m 3 in computation [15].…”

Section: Experimental Technique For Measuring Field Components In Phamentioning

confidence: 99%

Sar Distribution in a Bio-Medium in Close Proximity With Rectangular Dielectric Resonator Antenna

Gangwar¹,

Singh²,

Kumar³

2011

PIER B

View full text Add to dashboard Cite

Abstract-In this paper, the simulation and experimental studies of SAR distribution in a bio-medium situated very close to a rectangular dielectric resonator antenna (RDRA) in C-band of microwave frequencies are reported. The simulation study has been carried out using CST Microwave Studio simulation software. The experimental distribution has been obtained using two 50 Ω L-shaped and straight probes and Agilent make 3 Hz-50 GHz spectrum analyzer. The experimental results for SAR distribution are compared with simulated results.

show abstract

Study of Water Bolus Effect on Sar Penetration Depth and Effective Field Size for Local Hyperthermia

Cited by 27 publications

References 15 publications

Superficial Tumor Hyperthermia With Flat Left-Handed Metamaterial Lens

Superficial Tumor Hyperthermia With Flat Left-Handed Metamaterial Lens

Fem Modeling for Performance Evaluation of an Electromagnetic Oncology Deep Hyperthermia Applicator When Using Monopole, Inverted T, and Plate Antennas

Sar Distribution in a Bio-Medium in Close Proximity With Rectangular Dielectric Resonator Antenna

Contact Info

Product

Resources

About