Prof. Kavitha Arunachalam Profile

Prof. Kavitha Arunachalam

at Duke Univ Medical Ctr

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Author

Publications (5)

Proceedings Article | 4 March 2022 Presentation + Paper

Nanosecond laser-assisted hybrid micro-scribing based fabrication of frequency selective surface

Sooraj Shiby, Yugandhara Yadam, Balamurugan Sivaprakasam, Kavitha Arunachalam, Nilesh Vasa

Proceedings Volume 11989, 119890T (2022) https://doi.org/10.1117/12.2609855

KEYWORDS: Copper, Dielectrics, Laser ablation, Pulsed laser operation, Electrodes, Ions, Fabrication, FSS based metamaterials, Chlorine, X band

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Proceedings Article | 23 February 2011 Paper

Microwave radiometry for non-invasive detection of vesicoureteral reflux (VUR) following bladder warming

Oystein Klemetsen, Piero Tognolotti, Svein Jacobsen, Kavitha Arunachalam, Paolo Maccarini, Yngve Birkelund, Paul Stauffer, Fernando Bardati, Brent Snow, Valeria De Luca, Sara Salahi, Alina Boico

Proceedings Volume 7901, 79010V (2011) https://doi.org/10.1117/12.875636

KEYWORDS: Antennas, Bladder, Tissues, Kidney, Radiometry, Temperature metrology, Synthetic aperture radar, Skin, In vivo imaging, Modulation

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Proceedings Article | 25 February 2009 Paper

Clinical utility of magnetic resonance thermal imaging (MRTI) for realtime guidance of deep hyperthermia

Cecil Charles, Z. Li, J. MacFall, E. Jones, Mark Dewhirst, P. Maccarini, P. Stauffer, William Joines, T. Wong, S. Das, Cory Wyatt, K. Arunachalam, K. Cheng, Z. Vujaskovic, Oana Craciunescu, S. Rangarao, V. Stakhursky, Carlos Martins, B. Soher, O. Arabe

Proceedings Volume 7181, 71810I (2009) https://doi.org/10.1117/12.812188

KEYWORDS: Tumors, Magnetic resonance imaging, Tissues, Temperature metrology, Antennas, Magnetism, Phased arrays, Sensors, Fiber optics sensors, Breast

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Proceedings Article | 24 February 2009 Paper

Size reduction and radiation pattern shaping of multi-fed DCC slot antennas used in conformal microwave array hyperthermia applicators

Kavitha Arunachalam, Paolo Maccarini, Paul Stauffer, Carlos Martins

Proceedings Volume 7181, 718107 (2009) https://doi.org/10.1117/12.809952

KEYWORDS: Antennas, Microwave radiation, Synthetic aperture radar, Tissues, Amplifiers, Skin, Tumors, Near field, Chest, Neck

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The use of conformal antenna array in the treatment of superficial diseases can significantly increase patient comfort while enhancing the local control of large treatment area with irregular shapes. Originally a regular square multi-fed slot antenna (Dual Concentric Conductor - DCC) was proposed as basic unit cell of the array. The square DCC works well when the outline of the treatment area is rectangular such as in the main chest or back area but is not suitable to outline diseases spreading along the armpit and neck area. In addition as the area of the patch increases, the overall power density decreases affecting the efficiency and thus the ability to deliver the necessary thermal dose with medium power amplifier (<50W). A large number of small efficient antennas is preferable as the disease is more accurately contoured and the lower power requirement for the amplifiers correlates with system reliability, durability, linearity and overall reduced cost. For such reason we developed a set of design rules for multi-fed slot antennas with irregular contours and we implemented a design that reduce the area while increasing the perimeter of the slot, thus increasing the antenna efficiency and the power density. The simulation performed with several commercial packages (Ansoft HFSS, Imst Empire, SemcadX and CST Microwave Studio) show that the size reducing method can be applied to several shapes and for different frequencies. The SAR measurements of several DCCs are performed using an in-house high resolution scanning system with tumor equivalent liquid phantom both at 915 MHz for superficial hyperthermia systems in US) and 433 MHz (Europe). The experimental results are compared with the expected theoretical predictions and both simulated and measured patterns of single antennas of various size and shapes are then summed in various combinations using Matlab to show possible treatment irregular contours of complex diseases. The local control is expected to significantly improve while maintaining the patient comfort.

Proceedings Article | 12 February 2009 Paper

Progress on thermobrachytherapy surface applicator for superficial tissue disease

Paolo Maccarini, Jaime Schlorff, Oana Craciunescu, Kavitha Arunachalam, Paul Stauffer, Edward Markowitz

Proceedings Volume 7181, 71810C (2009) https://doi.org/10.1117/12.809493

KEYWORDS: Tissues, Antennas, High dynamic range imaging, Fluid dynamics, Natural surfaces, Chest, Water, Thermometry, Breast cancer, Infrared cameras

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