Optimal SAR Distribution from Waveguide Applicators for Hyperthermia of Deep-seated Tumours
نویسنده
چکیده
A major characteristic in the hyperthermia technology is the ability to focus heat energy on a small region around the tumour to be treated. By applying Kirchhoff-Huygens principle and the scalar theory of diffraction, specific absorption rate (SAR) distribution in a homogeneous muscle due to arrays of open-ended rectangular waveguide as directcontact applicators (ORWDAs) at 915 MHz are calculated. The results are compared with that of a single ORWDA operating at the same frequency. The array applicators may offer improvement in field size and penetration depth.
منابع مشابه
Interstitial devices for minimally invasive thermal ablation by high-intensity ultrasound.
Interstitial ultrasound applicators have been proposed for treating deep-seated tumours that cannot be reached with extra-corporeal high-intensity focused ultrasound. In addition, interstitial ultrasound offers several advantages compared with conventional ablation technology (radiofrequency, microwaves, cryotherapy) in terms of penetration, speed of coagulation, ability to direct and control t...
متن کاملConformal microwave array (CMA) applicators for hyperthermia of diffuse chest wall recurrence.
PURPOSE This article summarises the evolution of microwave array applicators for heating large area chest wall disease as an adjuvant to external beam radiation, systemic chemotherapy, and potentially simultaneous brachytherapy. METHODS Current devices used for thermotherapy of chest wall recurrence are reviewed. The largest conformal array applicator to date is evaluated in four studies: (1)...
متن کاملMetamaterial Antenna Arrays for Improved Uniformity of Microwave Hyperthermia Treatments
Current microwave hyperthermia applicators are not well suited for uniform heating of large tissue regions. The objective of this research is to identify an optimal microwave antenna array for clinical use in hyperthermia treatment of cancer. For this aim we present a novel 434MHz applicator design based on a metamaterial zeroth order mode resonator, which is used to build larger array configur...
متن کاملMicrowave Thermotherapy in Cancer Treat- Ment: Evaluation of Homogeneity of Sar Dis- Tribution
Medical applications of microwaves (i.e., a possibility to use microwave energy and/or microwave technique and technology for therapeutical purposes) are a quite new and very rapidly developing field. Microwave thermotherapy is being used in medicine for cancer treatment and treatment of some other diseases since early eighties. This paper is a contribution to a theory of phase array applicator...
متن کاملWaveguide Applicator System for Head and Neck Hyperthermia Treatment
The main purpose of this article is a complex hyperthermia applicator system design for treatment of head and neck region. The applicator system is composed of four waveguides with a stripline horn aperture and circular water bolus. The specific absorption rate (SAR) and temperature distribution from this applicator in various numerical phantom models was investigated. For used targets, the tre...
متن کامل