Design, development and microwave inter-comparison of dual slot antenna configurations for localized hepatic tumor management

Abstract

Slot antennas are generally preferred for localized liver cancer treatment modalities due to desired radiation characteristics. An iterative thermal/microwave numerical routine is used to analyze regular and miniature slot antenna configurations at 5.8 GHz. A thermal/microwave solver determines the specific absorption rate to malignant tissues as a pre- processing step to compute microwave solution in terms of propagation wave number, return loss and insertion loss. The regular and miniature dual slots antenna geometries were then developed to estimate the return loss characteristics against antennas slot lengths at a constant frequency of 5.8 GHz. Results reveal that the regular geometry has return loss less than -5 dB as compared to <-25 dB return loss for miniature slot antenna configuration. Furthermore, 5.8 GHz antenna geometry provides physical size reduction up to 50 %, lower fabrication cost and is a better minimally invasive choice due to further packed thermal ablation spots.

A multi-slot coaxial microwave antenna for liver tumor ablation

“…Recently developed small microwave antenna offers solution for creating larger spherical ablation volumes in the liver (Cavagnaro et al 2011, Wang et al 2015, Luyen et al 2017. The coaxial antenna with several slots has become the promising microwave heating antennas for ablating deep-seated tumors due to their high ablation sphericity index, simple construction, compact size, and low-cost (Brace 2011, Wang et al 2015, Zafa et al 2015, Gas 2017.…”

Design and development of a double spiral antenna with an artificial magnetic conductor structure for hyperthermia treatment

“…In the thermal conduction hyperthermia process, the cancerous tissue is heated by inserting high temperatures sources through catheters into the affected tissue or by putting a heated surface on the skin. 5 Non-invasive hyperthermia uses a heating element to dissipate heat to the cancer tissues. 6 This heating element can be an antenna (an EM radiator), which can resonate at different frequencies (434, 915, or 2450 MHz).…”

“…In this method, the electromagnetic energy increases the temperature of the affected tissues (tumor). In the thermal conduction hyperthermia process, the cancerous tissue is heated by inserting high temperatures sources through catheters into the affected tissue or by putting a heated surface on the skin 5 . Non‐invasive hyperthermia uses a heating element to dissipate heat to the cancer tissues 6 .…”