Control of the SAR Pattern Within an Interstitial Microwave Array through Variation of Antenna Driving Phase

Trembly, B. Stuart; Wilson, Andy; Sullivan, Michaela; Stein, A.D.; Wong, Terence Z.; Strohbehn, John W.

doi:10.1109/tmtt.1986.1133393

Cited by 40 publications

(11 citation statements)

References 9 publications

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“…Computational modeling can help optimize the input wave amplitude and phase to produce deeper tissue penetration and improved local control of the tumor ablation zone (63–65). Temporal modulation of the amplitude and phase of each antenna has also been analyzed during computational modeling (66,67). Placement of phased antennas in non-parallel fashion while maintaining the same homogenous ablation zone has also been explored (68).…”

Section: Uses Of Computational Modeling In Microwave Ablationmentioning

confidence: 99%

Computational modelling of microwave tumour ablations

Chiang

Wang

Brace

2013

International Journal of Hyperthermia

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Section: Uses Of Computational Modeling In Microwave Ablationmentioning

confidence: 99%

Computational modelling of microwave tumour ablations

Chiang

Wang

Brace

2013

International Journal of Hyperthermia

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“…74–81 The objective of many of these studies was to produce a precise zone of low-temperature hyperthermia (41–45 °C) in a target area without heating surrounding structures. Similar investigations for high-temperature microwave ablation are likely to follow.…”

Section: Microwave Ablation Technologymentioning

confidence: 99%

Microwave Tissue Ablation: Biophysics, Technology, and Applications

Brace

2010

Crit Rev Biomed Eng

271

214

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Microwave ablation is an emerging treatment option for many cancers, cardiac arrhythmias and other medical conditions. During treatment, microwaves are applied directly to tissues to produce rapid temperature elevations sufficient to produce immediate coagulative necrosis. The engineering design criteria for each application differ, with individual consideration for factors such as desired ablation zone size, treatment duration, and procedural invasiveness. Recent technological developments in applicator cooling, power control and system optimization for specific applications promise to increase the utilization of microwave ablation in the future. This article will review the basic biophysics of microwave tissue heating, provide an overview of the design and operation of current equipment, and outline areas for future research for microwave ablation.

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“…One possibility would be to add a rectal applicator to treat bulky prostates or prostatic cancer. It is possible to control the temperature distribution within the array through manipulation of amplitude and phase [26,27,28]. The volume heated can be further increased by circulating cool air through the transrectal or transurethral catheters [29,30].…”

Section: Discussionmentioning

confidence: 99%

A coaxial microwave applicator for transurethral hyperthermia of the prostate

et al. 1993

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Benign prostatic hyperplasia (BPH) is a common disease of elderly men. The current definitive treatment for urinary obstruction caused by this disease is surgery (transurethral resection of the prostate, or TURP). Recent evidence suggests that hyperthermia may be a useful nonsurgical alternative for treatment of symptomatic BPH. A transurethral microwave applicator has been designed around a Foley catheter for delivery of local hyperthermia to the prostate. The Foley balloon is used to maintain the antenna position within the prostatic urethra. The Foley catheter also features an antenna choke to confine power deposition to the intended region. The antenna is a coaxial dipole designed to operate at 915 MHz. Qualitative and quantitative specific absorption rate (SAR) patterns are shown for this antenna. In vivo experiments in dog prostate demonstrate that temperatures > 42 degrees C can be obtained > 1 cm away from the catheter, while maintaining a maximum urethral temperature of 47 degrees C to 48 degrees C. Histology obtained acutely after the hyperthermia treatments showed minimal damage to the periurethral tissues. We conclude from these studies that this microwave applicator is capable of providing local hyperthermia to the prostatic tissues with a predictable and well-circumscribed thermal distribution.

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Control of the SAR Pattern Within an Interstitial Microwave Array through Variation of Antenna Driving Phase

Cited by 40 publications

References 9 publications

Computational modelling of microwave tumour ablations

Computational modelling of microwave tumour ablations

Microwave Tissue Ablation: Biophysics, Technology, and Applications

A coaxial microwave applicator for transurethral hyperthermia of the prostate

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